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146 results about "Semiconductor saturable absorber" patented technology

A semiconductor saturable absorber mirror (SESAM) (or simply SAM = saturable absorber mirror) is a mirror structure with an incorporated saturable absorber, all made in semiconductor technology.

High-repetition rate passively mode-locked solid-state laser

A passively mode-locked solid-state laser for emitting a continuous-wave train of electromagnetic-radiation pulses, the fundamental repetition rate of the emitted pulses exceeding 1 GHz, without Q-switching has an optical resonator, a solid-state laser gain element placed inside the optical resonator, an exciter for exciting said laser gain element to emit electromagnetic radiation having the effective wavelength, and a saturable absorber for passive mode locking. The laser gain element preferably consists of a laser material with a stimulated emission cross section exceeding 0.8x10-18 cm-2 at the effective wavelength. Typically, the laser gain element is made of Nd:vanadate. The saturable absorber is preferably a semiconductor saturable absorber mirror device. The laser is simple, robust, compact, efficient, and low-cost. It generates a relatively large average power of 100 mW and higher, which is useful for a number of optical probing and detection applications, in a beam which is substantially a fundamental spatial mode.
Owner:LUMENTUM SWITZERLAND AG

High-repetition-rate passively mode-locked solid-state laser

A passively mode-locked solid-state laser is designed to emit a continuous-wave train (51, 52) of electromagnetic-radiation pulses, the fundamental repetition rate of the emitted pulses exceeding 1 GHz, without Q-switching instabilities. The laser includes an optical resonator (3.1), a solid-state laser gain element (2) placed inside the optical resonator (3.1), a device (1) for exciting said laser gain element (2) to emit electromagnetic radiation having the effective wavelength, and a device (4) for passive mode locking including a saturable absorber. The laser gain element (2) is a laser material with a stimulated emission cross section exceeding 0.8×10−18 cm2 at the effective wavelength, and is made of Nd:vanadate. The saturable absorber (4) is preferably a semiconductor saturable absorber mirror (SESAM) device. Even higher repetition rates are achieved by operating the laser in the soliton regime. For use in fiber-optical telecommunication, the laser wavelength is preferably shifted to 1.5 μm by use of an optical parametric oscillator. The laser is simple, robust, compact, efficient, and low-cost. It generates a relatively large average power of 100 mW and higher, which is useful for a number of optical probing and detection applications, in a beam (51, 52) that is substantially a fundamental spatial mode.
Owner:LUMENTUM SWITZERLAND AG

Passive mode-locking fiber laser with double-wavelength short pulse output

The invention discloses a passive mode-locking fiber laser with a double-wavelength short pulse output. The invention has the characteristics of high stability, high efficiency, high power, high pulse repetition rate, synchronous passive laser impulse, single-line polarization, tunability, double wavelength and ultrashort pulse output. The ultrashort pulse fiber laser of the invention uses two polarization-preserving rare-earth doped (Er3+ / doped Yb3+) fibers as laser grain media, adopts a broadband polarization beam splitter spectrum and a broadband chirp polarization-preserving fiber grating and the like as cavity surface reflecting elements and chromatic dispersion compensation elements and utilizes a semiconductor saturable absorber as mode-locked elements and the like to achieve double-wavelength passive synchronous ultrashort pulse mode-locked fiber laser output. The passive mode-locking fiber laser with the double-wavelength short pulse output is a fiber laser with a novel structure of double-wavelength mode-locked ultrashort pulse output, which can achieve full-fiber.
Owner:SUZHOU UNIV

Totally positive dispersion cavity mode-locked all-fiber laser

The invention discloses a totally positive dispersion cavity mode-locked all-fiber laser which is a fiber laser structure with high repetition rate and power, simple structure and high efficiency and is an all-fibermode-locked ultrashort laser pulse laser with stable environment and novel structure. The all-fiber laser takes rare earth doped fiber as a laser gain medium, works in a totally positive dispersion area, uses a polarizing beam splitter to split light, uses a band-pass type long-period fiber grating filter for wavelength selectivity of a mode-locked laser centre and spectral filtering light pulse compression of mode-locked laser and takes a semiconductor saturable absorber as fiber laser structures. The totally positive dispersion cavity mode-locked all-fiber laser has picosecond and femtosecond light impulse length polarizing laser output and lasers with the wavelengths longer than 1 micrometer and can be used for pumping-detecting ultrafast light physical experiments or the environmental monitoring and the microwave photonics and biophysics detection of a molecular system, double-wavelength pumping-detecting ultrafast light physical experiments, frequency-combining light radiation generation, coherent anti-Stokes Raman scattering microscopy, micromachining, and the like by being amplified by a high-power fiber amplifier.
Owner:SUZHOU UNIV

Double cladding large mode field area Yb-doped photon crystal optical fiber femtosecond laser

The invention discloses a double-coating large-mode-area photon crystal flysecond laser directly obtaining micro joule-level single pulse energy, belonging to the field of laser technique and nonlinear optics, where the laser main body is based on double-coating large-mode-area photon crystal optical fiber of polarization-protection structure and adopts high-power LD laser to directly pump; the laser uses grating pair to compensate dispersion, starts mode locking with the help of semiconductor saturable absorber mirror (SESAM), and controls polarization by wave plate and polarization beam splitter and implements tunable output; laser resonant cavity keeps net positive dispersion inside and runs in self-similar mode locking mode and outside-cavity dispersion compensation is made on the output pulse and the pulse is 100-200fs wide. And the advantages: the laser has good stability, and the output pulse has high energy and high repeating frequency. And the invention can effectively avoid split of pulse running at high energy.
Owner:TIANJIN UNIV

Cavity monitoring device for pulse laser

A fiber laser system is provided with a laser cavity including at least a gain fiber, an output coupling mirror, and a saturable absorber mirror. A photo sensor detects leakage light passing through the saturable absorber mirror, for purposes of monitoring the performance of the laser system. The saturable absorber mirror may include a semiconductor saturable absorber having a Bragg reflector monolithically formed on one side thereof.
Owner:IMRA AMERICA

Resonant cavity for outputting mode-locking picosecond laser and mode-locking picosecond laser device

The invention provides a resonant cavity for outputting mode-locking picosecond laser and a mode-locking picosecond laser device. The mode-locking picosecond laser device comprises a pumping source, a focusing lens and the resonant cavity for outputting the mode-locking picosecond laser, and the pumping source, the focusing lens and the resonant cavity are sequentially arranged along a light path. The resonant cavity is characterized that a laser crystal, a focusing device, a Fabry-Perot etalon and a semiconductor saturable absorber mirror are arranged in the resonant cavity, and the energy density of light beams acting on the semiconductor saturable absorber mirror can be sufficient to realize continuous mode-locking owing to the focusing device. Peak power of the picosecond laser device can be accurately controlled, so that different application requirements can be effectively met advantageously. Besides, pulse width of the picosecond laser device can be controlled, so that different application requirements can be effectively met advantageously. In addition, picosecond pulse width can be tuned, operation is easy, and mode-locking stability is unaffected. A pulse width tunable device is small in size and is beneficial to saving space.
Owner:ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI +1

Resonant fabry-perot semiconductor saturable absorbers and two photon absorption power limiters

InactiveUS6956887B2Limit pulse shorteningFacilitating cw modelockingPhotomechanical apparatusOptical resonator shape and constructionTwo-photon absorptionQ-switching
An intracavity resonant Fabry-Perot saturable absorber (R-FPSA) induces modelocking in a laser such as a fiber laser. An optical limiter such as a two photon absorber (TPA) can be used in conjunction with the R-FPSA, so that Q-switching is inhibited, resulting in laser output that is cw modelocked. By using both an R-FPSA and a TPA, the Q-switched modelocked behavior of a fiber laser is observed to evolve into cw modelocking.
Owner:IMRA AMERICA

All-fiber pulsed laser

The invention discloses an all-fiber pulsed laser, and belongs to the field of laser technology and nonlinear optics. The all-fiber pulsed laser includes a pump source (1), an optical combiner (2), a first gain fiber (3), a second gain fiber (4), a first reflective fiber Bragg grating (5), a second reflective fiber Bragg grating (6), an optical isolator (7), a full reflection mirror (8) and a circulator (9), and adopts a structure of linear cavity or annular cavity. By use of the rare earth-doped gain fibers as a laser modulator, with no additional external modulation source and an all-fiber structure, ultrashort pulse laser output of high stability, high power, high energy and high efficiency is achieved. Compared with a semiconductor saturable absorption mirror (SESAM) and graphene (Graphene) modulation Q, mode-locking technology, the all-fiber pulsed laser employs gain fiber for direct pulse modulation, has the advantages of simple design, compact structure and high stability, and is easier to industrialize.
Owner:BWT BEIJING

Two-dimensional semiconductor saturable absorber mirror and preparation method thereof, and pulse fiber laser

The invention relates to the technical field of lasers, and provides a two-dimensional semiconductor saturable absorber mirror. The two-dimensional semiconductor saturable absorber mirror comprises an optical fiber, a two-dimensional semiconductor film attached to the optical fiber end face and a gold film attached to the two-dimensional semiconductor film. The invention further provides a preparation method of the two-dimensional semiconductor saturable absorber mirror. The preparation method comprises the steps of: cutting the optical fiber; placing the cut optical fiber and a two-dimensional semiconductor target material in a vacuum chamber, depositing two-dimensional semiconductor plasma on the optical fiber end face, forming the two-dimensional semiconductor film, and enabling the two-dimensional semiconductor film to reach the required thickness by controlling the deposition time and / or the deposition temperature; and plating the gold film on the obtained two-dimensional semiconductor film. The novel two-dimensional semiconductor saturable absorber mirror provided by the invention is composed of the optical fiber end face, the two-dimensional semiconductor film and the gold film, and has the advantages of being high in damage threshold, simple in structure, low in cost, and high in reliability.
Owner:SHENZHEN UNIV

Method for organizing a mode-locked pulse train by pump modulation

InactiveUS20050163170A1High fundamental repetition rateIncreased stability against noiseLaser using scattering effectsActive medium shape and constructionFiberMode locked fiber laser
The present invention describes a method to achieve stabilization of the repetition rate in a passive harmonic mode-locked fiber laser employing semiconductor saturable absorbers. The pulse organization is accomplished by electrically modulating the amplifier pump source that in turn optically modulates the saturable loss of semiconductor absorber. Moreover owing on an efficient modulation mechanism of the cavity loss, the method can be used to generate an actively mode-lock pulse train. The invention offers the advantages of an actively modulated mode-locked laser while maintaining the simplicity and the cost effectiveness of a passive mode-locked system. We expect that this approach combined with the use of regenerative modulation technique and polarization-maintaining fiber components will permit the generation of the dropout-free pulse trains at gigahertz repetition rates with good long-term stability and minimal cost.
Owner:OPTOELECTRONICS RES CENT

MHz photonic crystal fiber ultra-short pulse laser based on multichannel pulse compressor

The invention discloses a MHz photonic crystal fiber ultra-short pulse laser based on a multichannel pulse compressor. The laser comprises a diode pumping source, a photonic crystal fiber, an intra-cavity pulse compressor, a semiconductor saturable absorber mirror and an extra-cavity pulse compressor, wherein the inter-cavity pulse compressor and the extra-cavity pulse compressor respectively are an intra-cavity multichannel pulse compressor and an extra-cavity multichannel pulse compressor. The main bodies of the multichannel pulse compressors are end mirrors in which two concave spherical surfaces are coaxially and oppositely arranged, each end mirror is provided with a rotating ring, and a concave spherical reflector is arranged in the rotating ring. The MHz photonic crystal fiber ultra-short pulse laser has the advantages that the low recurrence frequency of the pulse laser greatly reduces heat accumulation of pulse on components and prolongs the service life of the components, meanwhile, the intra-cavity multichannel compressor and the extra-cavity multichannel compressor with low loss and compact structure overcome the disadvantages of other chromatic dispersion compensation technologies, and the ultra-short pulse laser with low cost, high energy and high peak power output is realized.
Owner:TIANJIN UNIV

Compact ultra fast laser

The solid state laser comprises a laser gain medium (1), pumping means for pumping the laser gain medium, and a laser cavity having a first end (3) and a second end (17), wherein the laser gain medium is at, or in the vicinity of, said first end (3) of said cavity. A semiconductor saturable absorber mirror (SESAM) can be placed at the second end (17) of the cavity. The laser gain medium can comprise at least one face for receiving pumping energy from the pumping means, the face being made reflective at a laser frequency of the laser, so that it can form the first end of the laser cavity. The resulting setup used for generating femtosecond laser pulses.
Owner:HIGH Q LASER

Semiconductor passive Q-switch providing variable outputs

A semiconductor wafer with variable transmittance, serves as a saturable absorber for performing passive Q-switching in a laser system to produce laser pulses having defined output characteristics. By translating or rotating the semiconductor saturable absorber, loss properties of a laser cavity may be altered. In this manner, the output characteristics of the laser pulses can be varied without changing other parameters of laser operation. The output characteristics may include pulse duration, pulse repetition rate, peak power and average output power of the laser pulses. The semiconductor wafer can be made of doped or undoped GaAs, AlGaAs, InP, etc. Furthermore, the tunable Q-switch may simultaneously serve as an output coupler for the laser cavity.
Owner:NANYANG TECH UNIV

Semiconductor saturable absorption mirror as well as preparation method and optical fiber laser thereof

The invention relates to a semiconductor saturable absorption mirror as well as a preparation method and an optical fiber laser thereof. The semiconductor saturable absorption mirror comprises a substrate, a reflector and an absorption layer, wherein the reflector is prepared on the substrate; the absorption layer is prepared on the reflector; the reflector is a Bragg reflector formed by a plurality of high and low refractive rate layers; the absorption layer comprises a plurality of absorption sublayers, and all the absorption sublayers and buffer layers matched with crystal lattices of the absorption sublayers interactively grow; the buffer layers are transparent semiconductor layers; and the thicknesses of the absorption sublayers are same. The semiconductor saturable absorption mirror is a high-consistency broadband high-demodulation depth semiconductor saturable absorption mirror and increases the use broadband by improving the demodulation depth consistency in the broadband range, and a locked mode is started by the semiconductor saturable absorption mirror so as to obtain stable locked mode pulse output.
Owner:PEKING UNIV +1

Semiconductor Saturable Absorber Reflector and Method to Fabricate Thereof

A design of a semiconductor saturable absorber that offers a convenient and reliable way to control / decrease the recovery time of the absorption. The absorption recovery time is controlled during the epitaxial growth by using lattice-mismatched layer(s) to induce dislocations, and implicitly non-radiative recombination centers within the nonlinear absorbing region. These lattice reformation layer(s) are interposed between the distributed Bragg reflector and the nonlinear absorption region, containing quantum-wells, quantum-dots or bulk semiconductor material. The thickness and composition of the lattice reformation layer(s) is an instrumental to control the amount of non-radiative recombination centers used to trap the optically excited carriers generated in the absorption region.
Owner:OPTOELECTRONICS RES CENT

Ultrashort pulse light source and two-photon absorption recording medium recording apparatus having the same

Providing a soliton mode-locked solid-state laser that includes a resonator, a first end of which is formed of a semiconductor saturable absorption mirror, a solid-state laser medium, a negative group velocity dispersion compensator for compensating for group velocity dispersion within the resonator, and an excitation optical system that outputs excitation light for exciting the solid-state laser medium, and oscillates soliton pulse laser light with a repetition frequency of not less than 1 GHz, an intensity modulator that includes a waveguide electrooptic modulator for modulating intensity of the soliton pulse laser light and a driver for applying a voltage to the waveguide electrooptic modulator according to desired information, and a nonlinear optical element for converting the intensity-modulated soliton pulse laser light to a second harmonic wave.
Owner:FUJIFILM CORP

Ultra-broadband graphene-based saturable absorber mirror

An Ultra-broadband graphene-based saturable absorber mirror (graphene SAM) used as passive mode locker and Q-switch of lasers was invented. The graphene SAM comprises an optical substrate, an Aurum(Au) reflection film and graphene layer(s). Combining the ultra-broadband high reflectivity of Au film with ultra-broadband saturable absorption of graphene, the graphene SAM could be used as saturable absorber for passive mode locking and Q-switching over an ultra-wide spectral range from near-infrared to mid-infrared spectral region. Compared to semiconductor saturable absorber mirror (SESAM), the graphene SAM has the advantages of ultra-broadband operation, low linear loss, easy fabrication, low cost, and enabling mass production. This invented graphene SAM will have a wide prospect of application.
Owner:SHANGHAI JIAO TONG UNIV

All-solid-state femtosecond laser of passive mode locking Nd,Y:CaF2 of diode pumping

The invention discloses an all-solid-state femtosecond laser of passive mode locking Nd,Y:CaF2 of diode pumping. An Nd,Y:CaF2 laser crystal of the laser receives pumping laser penetrating through an optical coupling focusing system and a dichroic mirror; a first concave mirror, a second concave mirror and the dichroic mirror form a compact type confocal folded cavity; a third concave mirror focuses gain laser in a resonant cavity to a semiconductor saturable absorber mirror; the semiconductor saturable absorber mirror is used for starting and maintaining stable mode locking; a first GTI mirror and a second GTI mirror are used for compensating for positive chromatic dispersion in the resonant cavity; a coupling output mirror is used for outputting a stable passive mode locking pulse sequence. The all-solid-state femtosecond laser formed in the mode that a pumping source based on a laser diode is obtained, CaF2 with Nd3+ and Y3+ co-doped serves as a gain medium, the GTI mirrors are used for compensating for chromatic dispersion and the semiconductor saturable absorber mirror is used for starting mode locking, and the stable mode locking pulse sequence with the pulse width of 264 fs is output inside the resonant cavity. A laser diode pumping technology is adopted, so that the all-solid-state femtosecond laser has broader application prospects.
Owner:XIDIAN UNIV

Novel microchip laser supporting optical fiber output

The invention discloses a novel microchip laser supporting optical fiber output, which belongs to the fields of laser technology and non-linear optics. The novel microchip laser mainly comprises a laser diode pumping source, an optical fiber output system, an optical collimation system, a laser light gain medium and optical elements, wherein pump light enters the optical collimation system for collimating after passing through the optical fiber output system, and is focused onto the gain medium; the film-plated optical elements are arranged in front of and behind the gain medium; the gain medium and the film-plated optical elements in front of and behind the gain medium construct a laser resonant cavity with a sandwich structure; laser light generated by the laser resonant cavity returns along the incident direction of the pump light, passes through the optical collimation system once again, and is output through the optical fiber output system. The novel microchip laser has the characteristics that optical fiber output is performed during the use of an optical fiber pump without any additional output device in a sandwich microchip structure, and a fiber-core pump or a cladding pump can be adopted, so that the flexibility of a system is improved greatly; and meanwhile, the structure can also be applied to pulse modulation of materials such as semiconductor saturable absorbing mirrors, single-wall carbon nanotubes or graphene and the like, and stable pulse output is realized.
Owner:BEIJING UNIV OF TECH

Bicavity series full solidifying fly second laser

The invention relates to a totally solidified femtosecond laser with a double cavities series structure, which is made up of four semiconductor laser pumping sources, four plating sphere mirrors, two blocks of laser crystals used as gain media, two prism pairs, a fully reflector (or semiconductor saturated absorbing mirror) and a output coupling mirror. The centre wavelength outputted by the laser is 830nm, the tuning range is 100nm, and the outputted pulse width is about 100fs. The centre wavelength outputted by semiconductor pumping light source is 673nm. The laser is compact, the cost is low and the performance is stable.
Owner:FUDAN UNIV

All-fiber pulse laser utilizing cross modulation of resonant cavities

The invention discloses an all-fiber pulse laser utilizing cross modulation of resonant cavities, and belongs to the fields of laser technologies and nonlinear optics. The all-fiber pulse laser mainly comprises a pumping source (1), a fiber combiner (2), a wavelength division multiplexer (2'), a first gain fiber (3), a second gain fiber (4), reflection type fiber Bragg gratings (5)(6)(7)(8), an optical isolator (9), a total reflector (0), a circulator (10), a filter (11) and an optical fiber coupler (12). According to the all-fiber pulse laser, an optical fiber doped with a rare earth element is taken as a gain medium and a saturable absorber and is of an all-fiber structure, and has the characteristics of high stability, high power, high energy and high efficiency. The all-fiber pulse laser is different from acousto-optic, electro-optic, semiconductor saturable absorber mirror (SESAM) and graphene (Graphene) Q modulation and mode-locking techniques, pulse modulation is directly carried out by utilizing the gain fiber, so that the all-fiber pulse laser is simple in design, compact in structure and cost-saving, and meanwhile, through the dual-cavity structural design utilizing the cross modulation effect of the resonant cavities, stability of system output is effectively improved.
Owner:BWT BEIJING

Ytterbium-doped ultrashort pulse fiber laser for dispersion compensation in cavity

InactiveCN101771231ASolve technical problems that cannot realize self-startingElectromagnetic transmissionActive medium shape and constructionMode-lockingDispersion compensation
An ytterbium-doped ultrashort pulse fiber laser for dispersion compensation in a cavity comprises a semiconductor pumping source connected with the input end of a wavelength division multiplexer as well as a photonic crystal fiber, a fiber coupling follower, polarization controllers and an optical isolator sequentially connected with the output end of the wavelength division multiplexer. Both ends of the optical isolator are provided with the polarization controllers; the wavelength division multiplexer, the photonic crystal fiber, the fiber coupling follower, the polarization controllers and the optical isolator are welded by optical fibers to form an annular cavity; a transmission-type semiconductor saturable absorption mirror is arranged between the wavelength division multiplexer and the photonic crystal fiber and is used for mode locking of the ytterbium-doped ultrashort pulse fiber laser; and one segment of the optical fiber between the wavelength division multiplexer and the transmission-type semiconductor saturable absorption mirror is an ytterbium-doped optical fiber. The ytterbium-doped ultrashort pulse fiber laser can be self-started and has wide application prospect.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI

Passive mode-locking laser with tunable pulse width

InactiveCN103794977AEasy to adjustContinuously adjustable output pulse widthLaser detailsResonant cavityMode-locking
The invention discloses a passive mode-locking laser with a tunable pulse width. The passive mode-locking laser with the tunable pulse width comprises an 880nm pumping source, a pumping light transmission optical fiber, a pumping light coupling system, a dichroic mirror, a gain crystal, a planar-concave reflecting mirror set, a cavity length regulator, a planar output mirror and a semiconductor saturable absorber, wherein the 880nm pumping source is coupled to the pumping light coupling system through the pumping light transmission optical fiber, the pumping light coupling system is coupled with the dichroic mirror, the dichroic mirror is respectively coupled with the gain crystal and the planar-concave reflecting mirror set, the gain crystal, the cavity length regulator and the planar output mirror are coupled in sequence, the planar-concave reflecting mirror set is coupled with the semiconductor saturable absorber, assemblies between the planar output mirror and the semiconductor saturable absorber jointly form a resonant cavity of a laser, the cavity length regulator is composed of two prisms, and the cavity length of the resonant cavity can be continuously adjusted by adjusting the distance between the two prisms. The passive mode-locking laser with the tunable pulse width can easily adjust the cavity length of the resonant cavity by adjusting the distance between the two prisms, continuously adjusts the laser output pulse width, obtains laser of different pulse widths, and solves the problem that continuously tunable mode locking laser with the output pulse width smaller than 100ps can not be output in the prior art.
Owner:11TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP

Polarization-maintaining all-fiber mode-locked laser with low repetition frequency

The invention discloses a polarization-maintaining all-fiber mode-locked laser with the low repetition frequency. An optical fiber type semiconductor saturable absorption mirror, a polarization-maintaining optical fiber mode field adapter, a polarization-maintaining single mode optical fiber, a polarization-maintaining optical fiber wavelength division multiplexer, a polarization-maintaining ytterbium-doped gain optical fiber and a polarization-maintaining optical fiber grating are connected in sequence in the optical transmission direction. A pump optical transmission optical fiber is connected with the input end of the polarization-maintaining optical fiber wavelength division multiplexer, wherein the input end is located on one side of the polarization-maintaining ytterbium-doped gain optical fiber. The polarization-maintaining all-fiber mode-locked laser with the low repetition frequency is based on the semiconductor saturable absorption mirror, the optical fiber type semiconductor saturable absorption mirror and the polarization-maintaining optical fiber grating form a linear cavity structure, stable mode locking automatic start is achieved, unstable mode locking caused by external slight vibration cannot occur, the all-fiber structure is achieved, integration is easy, all optical fiber devices of the laser adopt polarization-maintaining optical fiber splicing, it is ensured that the laser can output linear polarized light, and the polarization-maintaining all-fiber mode-locked laser with the low repetition frequency is simple and compact in structure, and good in mode locking stability.
Owner:BEIJING GK LASER TECH +1

Method for realizing all-fiber package of semiconductor saturable absorption mirror

InactiveCN102842843ARealize all-fiber packagingAvoid breakingLaser detailsRepeatabilitySemiconductor
The invention discloses a method for realizing an all-fiber package of a semiconductor saturable absorption mirror. The method comprises the following steps of: uniformly spreading ultraviolet glue on the upper surface of a ceramic fiber pin except for the part of the head face of a fiber core; slowly placing a semiconductor saturable absorption mirror which is not packaged on the upper surface of the ceramic fiber pin of a fiber ferrule connector (FC) joint horizontally; and connecting a fiber at the other end of the fiber FC joint in a cavity of a fiber laser. The semiconductor saturable absorption mirror or the fiber FC joint can be changed when experiments show that parameters of the placed semiconductor saturable absorption mirror of the model fail to satisfy the experiment requirements or show that the head face of a fiber core corresponding to the semiconductor saturable absorption mirror is damaged in the experiment process; and the ultraviolet glue can be adopted to cure when the experiments provs that the various parameters of the semiconductor saturable absorption mirror are accordant with the requirements. The method provided by the invention breaks through the technological monopoly at home and abroad, and is simple in operation, low in cost and excellent in repeatability; and the method fills the blank in the technical field at home.
Owner:NAT UNIV OF DEFENSE TECH

Mode-locked laser for outputting femtosecond pulse

The present invention provides a mode-locked laser for outputting a femtosecond pulse. The mode-locked laser includes a semiconductor saturable absorber, a semiconductor light amplifier, a multi-channel array waveguide grate and a phase delay waveguide array that are sequentially connected through a passive ridge waveguide between two cleavage planes. The mode-locked laser can output the femtosecond pulse without using an external pulse compression technology, and has the advantages of simple manufacture process, compact structure, low cost, and mass production.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI

Small-size frequency doubling green light optical fiber laser

The invention discloses a small-size frequency doubling green light optical fiber laser. The small-size frequency doubling green light optical fiber laser comprises a semiconductor saturable absorber mirror (SESAM), a pump light stripper, a double-cladding ytterbium-doped optical fiber, a pump combiner, a quasi-phase matching PPLN crystal, a broadband fiber bragg grating and an optical fiber collimator. The PPLN crystal is a waveguide device packaged by a temperature controller. According to the optical fiber laser of a full-waveguide structure, efficient lasers with the bandwidth central wavelength of 532 nm can be obtained based on the intracavity frequency doubling technology. The optical fiber laser is miniaturized, compact in structure, high in stability, high in frequency doubling efficiency and suitable for being applied to the application fields of laser projection machines and the like.
Owner:合肥恒锐光电科技有限公司

Ultra-narrow line width and wavelength adjustable composite cavity fiber laser device

The invention relates to the technical field of laser transmitters, and specifically discloses an ultra-narrow line width and wavelength adjustable composite cavity fiber laser device. In the ultra-narrow line width and wavelength adjustable composite cavity fiber laser device disclosed by the invention, a wavelength division multiplexer, an erbium-doped optical fiber amplifier, a 2*2 optical fiber coupler, a first optical isolator, a Y-shaped optical coupler are connected in sequence to form an annular main resonant cavity; a tunable F-P filter, a semiconductor saturable absorber, a 2*2 optical fiber coupler and a second optical isolator are connected in sequence to form an annular short resonant cavity. The composite cavity fiber laser is reasonable in structure, based on a linear cavity, an annular cavity and a composite cavity fiber laser device, line width deep compression and wavelength precision tuning are carried out on fiber laser by changing the magnitude, frequency and waveform of a voltage signal applied onto the tunable F-P filter and adjusting the change state of built-in piezoelectric ceramic cavity length, so that an ultra-narrow line width and wavelength adjustable function is obtained; and the composite cavity fiber laser device has the outstanding advantages of simple structure, electromagnetic interference prevention, ultra-narrow wavelength and line width, relatively low cost and the like.
Owner:WUHAN UNIV OF TECH

Totally positive dispersion cavity mode-locked all-fiber laser

The invention discloses a totally positive dispersion cavity mode-locked all-fiber laser, which is an environmentally-stable, novelly-structured and totally-optical mode-locked super-short laser pulse laser which works in a totally positive dispersion area and uses rare earth-mixed optical fibers as a laser gain medium, a polarization beam splitter to split light, a band-pass long-period fiber grafting filter as a mode-locked laser centre wavelength selection and mode-locked laser spectrum filtering optical pulse compression element, and a semiconductor saturable absorber as a mode-locked element and the like to form an optical fiber laser structure with high repetition rate, high power, simple structure and high efficiency. The laser outputs picosecond and femtosecond optical pulse-width polarized laser with a wavelength of 1 mu m which, after being amplified by the high-power optical fiber amplifier, can be used for molecularly systemic pumping-detection ultrafast optical physical experiment or environment monitoring, microwave photonic or biophysical detection, double-wavelength pumping-detection ultrafast optical physical experiment, frequency-combining optical radiation generation, coherent anti-stokes Raman scattering microscopy, micromachining and the like.
Owner:SUZHOU UNIV
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