30 results about "Dissipative soliton" patented technology

A saturable absorber (SA) is constructed using a fiber taper embedded in a carbon nanotube / polymer composite. A fiber taper is made by heating and pulling a small part of standard optical fiber. At the taper's waist light is guided by the glass-air interface, with an evanescent field protruding out of the taper. Carbon nanotubes mixed with an appropriate polymer host material are then wrapped around the fiber taper to interact with the evanescent field. Saturable absorption is possible due to the unique optical properties of the carbon nanotubes. The device can be used in mode-locked lasers where it initiates and stabilizes the pulses circulating around the laser cavity. The SA can be used in various laser cavities, and can enable different pulse evolutions such as solitons, self-similar pulses and dissipative solitons. Other applications include but are not limited to optical switching, pulse cleanup and pulse compression.

The invention belongs to the technical field of photoelectric equipments, in particular to a device capable of generating various optical solitons. The optical soliton generation device based on a passive mode-locked ytterbium-doped fiber laser comprises a polarization controller (1), a 1*N optical switch (2), an optical fiber group (3), a 1*N optical coupler (4), a dispersion compensation fiber (5), an optical isolator (6), a ytterbium-doped fiber, a light wavelength division multiplexing (8), a pump light source (9), a saturable absorber (10) and a 1*2 optical coupler (1). In the same passive mode-locked ytterbium-doped fiber laser system, the optical soliton generation device based on the passive mode-locked ytterbium-doped fiber laser is capable of obtaining parabolic dissipative soliton single-pulse optical solitons, hyperbolic secant-shaped soliton single-pulse optical solitons, bounded multi-soliton optical solitons of the two optical pulses and other optical solitons; when switching between different types of solitons, a user does not need to change a light path structure, and the switching speed is very fast.

A saturable absorber (SA) is constructed using a fiber taper embedded in a carbon nanotube / polymer composite. A fiber taper is made by heating and pulling a small part of standard optical fiber. At the taper's waist light is guided by the glass-air interface, with an evanescent field protruding out of the taper. Carbon nanotubes mixed with an appropriate polymer host material are then wrapped around the fiber taper to interact with the evanescent field. Saturable absorption is possible due to the unique optical properties of the carbon nanotubes. The device can be used in mode-locked lasers where it initiates and stabilizes the pulses circulating around the laser cavity. The SA can be used in various laser cavities, and can enable different pulse evolutions such as solitons, self-similar pulses and dissipative solitons. Other applications include but are not limited to optical switching, pulse cleanup and pulse compression.

The invention discloses a dispersion compensation fiber-based dissipative soliton and soliton dual-wavelength laser, which comprises a laser light diode, a beam combiner, a gain fiber, a coupled output element, a polarization independent isolator, a polarization maintaining fiber, a carbon nano tube, a dispersion compensation fiber, a polarizer, a first polarization controller and a second polarization controller, wherein the beam combiner, the gain fiber, the coupled output element, the polarization independent isolator, the dispersion compensation fiber, the polarization maintaining fiber, the carbon nano tube, the first polarization controller, the polarizer and the second polarization controller are connected according to a fiber order to form an all-fiber ring cavity; and the laser light diode is connected with the beam combiner as a pump light source of the laser. By the dispersion compensation fiber-based dissipative soliton and soliton dual-wavelength laser, 2micron-waveband traditional soliton and dissipative soliton dual-wavelength laser light output can be achieved; the structure is simpler; the cost is lower; and dual-wavelength output mode conversion can be simply and conveniently achieved.

The invention discloses a multi-purpose bidirectional passive mode-locked full-fiber laser system and aims to solve a technical problem that it is difficult for a convention fiber laser device to output two types of ultra-short optical pulses simultaneously. The system comprises a pumping source (1), a wavelength division multiplexer (2), an erbium-doped gain fiber (3), a 2*2 output coupler (4), a first 3dB optical coupler (5), a second 3dB optical coupler (6), a first polarization-dependent isolator (7), a first polarization controller (8), a second polarization-dependent isolator (9), a second polarization controller (10), a dispersion compensation fiber (11) and a single-mode fiber (14). The 2*2 output coupler (4) outputs a bidirectional mode-locked pulse. The first output end (12) of the 2*2 output coupler (4) is connected with the single-mode fiber (14) located outside a cavity and is used for the out-of-cavity time-domain compression of the output pulse to obtain a high-peak-power ultra-short pulse. The second output end (13) of the 2*2 output coupler (4) directly outputs a high-energy dissipative soliton resonance pulse. The system is low in cost and wide in application range, and can be used as a high-peak-power femtosecond pulse light source and a high-energy picosecond and nanosecond pulse light source, and can also be used as a seed source of a high-energy pulse amplifier.

The invention provides a 980nm dissipative soliton mode-locked laser, and relates to the technical field of laser, aiming at solving the problems that existing lasers are realized in a way of space coupling, so that a system is low in coupling efficiency and poor in stability. The 980nm dissipative soliton mode-locked laser comprises a wavelength division multiplexer, a gain fiber, an isolator, a coupling output element, a band-pass filter, a first polarization controller and a second polarization controller, wherein the wavelength division multiplexer, the gain fiber, the band-pass filter, the first polarization controller, the isolator, the second polarization controller are connected with the coupling output element in sequence of optical fiber, so that a full-optical fiber ring-shaped cavity is formed. After the 980nm dissipative soliton mode-locked laser is adopted, stable dissipative soliton mode-locked pulse output can be realized, the mode locking repeat frequency is 20.38MHz, the maximum output power is 26.1mW, a mode locking threshold value is 170mW, and the pulse width is 70-80ps; the 980nm dissipative soliton mode-locked laser not only can generate blue light of about 490nm by frequency multiplication, but also can serve as a light source with high brightness and long service life, and can be taken as a pumping source of an erbium-doped amplifier.

The invention provides a 1[mu]m dissipative soliton mode-locked laser, relating to the technical field of laser and aiming at solving the problems that the coupling efficiency of a system is low, the size of space coupling equipment is huge, the system stability is poor and the actual application is not facilitated because the existing device adopts a space coupling method. The 1[mu]m dissipative soliton mode-locked laser comprises a wavelength division multiplexer, gain fibers, an isolator, a coupling output element, a band-pass filter, a first polarization controller and a second polarization controller, wherein the wavelength division multiplexer, the gain fibers, the band-pass filter, the first polarization controller, the isolator and the second polarization controller are sequentially connected with the coupling output element through optical fibers to form an all-fiber ring cavity, and the length of the gain fibers is arranged to be length for enabling the laser to realize four-level oscillation starting. The 1[mu]m dissipative soliton mode-locked laser not only can be used as a high-brightness and high-beam-quality pumping source for a high-power ytterbium-doped laser, but also can further improve the output power of the ytterbium-doped laser and has a potential of being applied to cold light magnification.

The invention discloses a dissipation soliton active mode-locking fiber laser, and relates to the field of a laser. The laser comprises a strength modulator and a code pattern generator, which are mutually connected, wherein the code pattern generator inputs pulse sequence signals to the strength modulator; and the strength modulator is used for modulating under the driving of the pulse sequence signals. The dissipation soliton active mode-locking fiber laser provided by the invention inputs the pulse sequence signals to the strength modulator by using the code pattern generator, so as to modulate laser pulse. Furthermore, the high-energy mode-locking laser pulse output can be obtained, and the center wavelength of the output laser pulse can be moved within a large range; and the output laser pulse has flexible and adjustable pulse repeat frequency, and can accurately align an external clock.

An all optical fiber dissipative soliton resonance mode-locked laser device is disclosed and belongs to the technical field of laser. The all optical fiber dissipative soliton resonance mode-locked laser device comprises a pumping source and an optical fiber annular cavity, wherein the optical fiber annular cavity are formed by connecting a wavelength division multiplexer, an ytterbium-doped optical fiber, an optical isolator, an optical fiber coupler, a polarization controller and an optical fiber non-linear annular reflecting mirror via optical fibers; the optical fiber non-linear annular reflecting mirror is formed by connecting two output ports of the optical fiber coupler via the polarization controller. The optical fiber laser device disclosed in the invention adopts an all optical fiber structure and is high in light beam quality, and the optical fiber laser device is convenient to weld and couple and can be maintained conveniently. The optical fiber laser device does not adopt any narrowband spectrum filter, and pulse splitting caused by narrowband filtering effects can be prevented.

The invention provides a dual-wavelength dissipative soliton mode-locked laser, relates to the technical field of laser and aims to solve the problems that a conventional device is realized by adopting a space coupling mode, the coupling efficiency of the system is low, the space coupling equipment is large in size, and the system is low in stability and inconvenient to apply. The dual-wavelength dissipative soliton mode-locked laser comprises a wavelength division multiplexer, a gain optical fiber, an isolator and a coupling output element, and also comprises a band-pass filter, a first polarization controller and a second polarization controller, wherein the wavelength division multiplexer, the gain optical fiber, the band-pass filter, the first polarization controller, the isolator, the second polarization controller and the coupling output element are connected according to an optical fiber sequence to form an all-fiber annular cavity; the length of the gain optical fiber is a length through which the gain optical fiber has four-level start oscillation and three-level start oscillation. By adoption of a double-end pumped mode and the all-fiber annular cavity structure, the band-pass filter is inserted into the cavity, and stable dual-wavelength laser output is realized by adopting a polarization rotation mode-locked mode.

The invention discloses an all-optical-fiber sub-hundred-femtosecond ultrashort pulse generation apparatus with a compact structure. The apparatus comprises a dissipation soliton oscillator, an output isolation part, a pre-compression part and an amplifying and nonlinear compression part which are connected in sequence through mono-mode optical fibers; negative dispersion is introduced to the pre-compression part; the negative chirp quantity provided by the pre-compression part is less than the positive chirp quantity of input pulse; the dissipation soliton oscillator generates pulse with relatively high energy and positive chirp, and the pulse enters the pre-compression part through the output isolation part to compress the pulse width and improve the pulse peak power, and finally, the pulse energy in the amplifying and nonlinear compression part is improved; and the pulse spectrum is widened and the pulse width is compressed through the nonlinear process to obtain the sub-hundred-femtosecond ultrashort pulse. The apparatus has the all-optical-fibre structure and relatively high resistance to external environment disturbance based on a dissipation soliton optical fibre laser in a single-wall carbon nanotube locking mode and can stably output sub-hundred-femtosecond pulse for a long time.

A system for single pass amplification of dissipative soliton-like seed pulses of 1-20 ps to produce output pulses of 50-200 fs, without requiring a stretcher. Such an amplifier relies on the inherent chirp of the seed pulse out of the oscillator instead of pulse stretching.

A normal-dispersion fiber laser is operated using parameters in which dissipative solitons exist with remarkably large pulse duration and chirp, along with large pulse energy. A low-repetition-rate oscillator that generates pulses with large and linear chirp can thus replace the standard oscillator, stretcher, pulse-picker and preamplifier in a chirped-pulse fiber amplifier.

The invention belongs to the technical field of the fiber optic lasers and in particular relates to a device capable of generating a plurality of types of optical solitons. The structure of the device comprises a 1*N optical switch (1), a dispersion-compensation optical fiber group (2), a 1*N optical coupler (3), a saturable absorber (4), a single mode optical fiber (5), an optical coupler (6), a ytterbium doped fiber (7), a light wavelength division multiplexer (8), a pump light source (9), an adjustable optical fiber (10) and a 1*2 optical coupler (11). The device is capable of obtaining a plurality of types of optical solitons such as scattered soliton monopulse, ordinary optical soliton monopulse and bound-state multi-solitons of the two optical pulses by selecting the dispersion-compensation optical fibers different in length; the environmental parameters of the system are not changed during switching between different optical pulses, and the device is high in switching speed, convenient to use and good in repeatability.

The invention discloses a novel method for generating high-order vector dissipative solitons, and relates to a method. The novel method includes sequentially connecting a wavelength division multiplexer, an erbium optical fiber, an optical fiber coupler, a polarization controller, an optical circulator and a semiconductor saturable absorption mirror with one another by single-mode passive optical fibers to form a positive dispersion optical fiber ring cavity; connecting an output end of the coupler with the polarization controller and a polarization beam splitter; coupling pump laser to a gain optical fiber by the aid of the wavelength division multiplexer and changing double-refraction of the inside of the cavity to generate basic-order vector dissipative solitons; outputting the basic-order vector dissipative solitons via a port of the optical fiber coupler, then introducing phase difference of integer times 2 pi between two polarization components of each basic-order vector dissipative soliton by the aid of the polarization controller, enabling the polarization components to pass the polarization beam splitter at certain angles and then outputting pulses of the high-order vector dissipative solitons. The novel method has the advantages that a polarization component of each obtained high-order vector dissipative soliton is presented as the corresponding single-peak pulse, each other polarization component which is orthogonal to the first polarization component of the corresponding high-order vector dissipative soliton is presented as the corresponding double-peak pulse, and phase difference of pi exists between the two peaks of each high-order vector dissipative soliton.

The invention discloses a dissipative soliton laser in 2 micron wave band, including pumping sources, wavelength division multiplexer, isolator, spectral filter, gain fiber, optical fiber polarizationcontroller, fiber polarization beam splitter and micro-nano fiber, the wavelength division multiplexer, isolator, spectral filter, gain fiber, optical fiber polarization controller, A lase resonant cavity is formed by connecte that optical fiber polarization beam splitter and the micro-nano optical fib in series, wherein the micro-nano optical fiber in the loop is more than one section, the diameter of the waist section of at least one section of the micro-nano optical fiber is 800 nm to 1600 nm, the length is 5 mm to 1 m, and the length of the waist section of the at least one section of themicro-nano optical fiber satisfies L1: (L-L1) = 1: 3.5 to 50. Where L1 denotes the length of the waist portion of the micro-nano optical fiber and L denotes the sum of the lengths of all the opticalfibers in the loop. The output spectrum of the invention has a wide spectrum of tens of nanometers and a flat spectrum, and solves the technical problem that the prior art has not solved for a long time.

The invention provides a resonant mode-locked fiber laser based on 2Mum dissipative solitons. The resonant mode-locked fiber laser comprises a pumping source and an annular fiber cavity. The annular fiber cavity is formed by connection of a wavelength division multiplexer, a thulium-doped fiber, an optical isolator, a fiber coupler, a filter and a fiber nonlinear annular reflector through single-mode fibers. The fiber nonlinear annular reflector is formed by connecting two output ports of the fiber coupler through a fluoride (ZBLAN) ultra-flat dispersion compensation photonic crystal fiber. The resonant mode-locked fiber laser has the advantages that the fiber laser of an all-fiber structure has high beam quality, and is convenient for fusion and convenient to maintain; the fiber laser canoutput 2Mum dissipative soliton resonance pulses by adjusting pumping lights and characteristics of different parameters in the cavity.

The invention discloses a high-energy dissipative soliton resonance rectangular pulse generating system, which comprises: a 9-shaped resonant cavity based on a nonlinear amplifying annular mirror mode-locking technology, a double-clad thulium-doped optical fiber pre-amplifier, and a double-clad thulium-doped optical fiber main power amplifier, wherein the 9-shaped resonant cavity is connected to the pre-amplifier; the pre-amplifier is connected with the main power amplifier; the 9-shaped resonant cavity is configured to generate a dissipative soliton resonance rectangular pulse which is pre-amplified by the pre-amplifier and transmitted to the main power amplifier to be subjected to power amplification such that the high-energy dissipative soliton resonance rectangular pulse is obtained. The dissipative soliton resonance rectangular pulse can be obtained through the resonant cavity, and then is subjected to the power amplification by an optical fiber amplifier, thereby obtaining the high-energy dissipative soliton resonance rectangular pulse, and outputting a high-energy rectangular laser pulse with an adjustable pulse width.

The invention discloses a dissipative soliton mode-locked fiber laser employing an optical fiber integrated device, and the optical fiber integrated device comprises two double-fiber collimators whichare arranged in an aligned manner, and an isolator and a filter which are disposed between the two double-fiber collimators. A resonant cavity of the mode-locked fiber laser comprises the optical fiber integrated device and a gain optical fiber, and a resonant cavity optical fiber is provided with a polarization controller in a clamping manner. A structure which consists of the polarization related optical fiber integrated device and the polarization controller can enable the laser to employ the nonlinear polarization rotating mode locking technology. The net dispersion in the resonant cavityof the optical fiber laser is positive, and the optical fiber integrated device can provide a filtering effect, and forms a support dissipative soliton in the mode-locked fiber laser. The structuraldesign of the mode-locked fiber laser is greatly simplified through the optical fiber laser, the packaging and miniaturization of the laser are facilitated, and the implementation of a high-repetition-frequency optical fiber laser is facilitated.

The invention relates to an acoustic method and device for localized, contactless, measurement of elastic and dissipative non-linearities and dynamic non-linear viscoelasticity in a medium subjected to a low-frequency acoustic stress and probed by ultrasonic pulses or wave trains. For this purpose, the invention relates to an acoustic, localized and contactless device for measuring elastic and dissipative nonlinearities and viscoelasticity of a specimen (2), characterized in that it comprises: means (10, 20, 22, 24) for transmitting a low-frequency acoustic wave (24a) and means (26, 34, 30) for receiving said low-frequency acoustic wave, which means are capable of creating a low-frequency periodic variation of the hydrostatic pressure in the specimen (2); means (10, 12, 14) for generating high-frequency ultrasonic pulses (14a) and means (16, 28, 30) for receiving said pulses; and an analysis unit (32) that includes a model for calculating the modulations in the time of flight and in the amplitude of the ultrasonic pulses (14a) that are induced by the low-frequency acoustic wave (24a) passing through the specimen (2), so as to quantify the elastic and dissipative non-linearities and the non-linear viscoelasticity of the specimen (2).

The invention belongs to the optical soliton technology field and particularly relates to an optical soliton pulse generator formed by an erbium-doped-fiber laser. The optical soliton pulse generator formed by erbium-doped-fiber laser comprises a 1*2 optical coupler (1), a 1*N optical switch (2), an optical fiber group (3), a 1*N optical coupler (4), a saturable absorber (5), an optical isolator (6), an erbium-doped fiber (7), an optical wavelength division multiplexer (8), a pump light source (9) and a polarization controller (10). According to the optical soliton pulse generator formed by the erbium-doped-fiber laser, soliton in multiple types such as a ground state optical soliton pulse and a dissipation soliton pulse and bound state multi-soliton of the ground state optical soliton pulse and the dissipation soliton pulse can be obtained in the same passive mode-locking erbium-doped fiber laser system, the performance is stable, and the repeatability is good.

The invention discloses a period bifurcation dissipative soliton resonance pulse fiber laser, which comprises a pump source, a wavelength division multiplexing coupler, a ytterbium-doped gain fiber, an isolator, a first output coupler, a first polarization controller and a fiber nonlinear ring reflector. The output end of the pump source is connected with the input end of the wavelength division multiplexing coupler; and the wavelength division multiplexing coupler, the ytterbium-doped gain fiber, the isolator, the first output coupler, the first polarization controller and the fiber nonlinearring reflector are connected in sequence to form a fiber ring cavity. The fiber nonlinear ring reflector comprises a second output coupler. A single-mode fiber and a second polarization controller are connected between two output ports of the second output coupler; and two input ports of the second output coupler are connected with the first polarization controller and the wavelength division multiplexing coupler respectively. The invention also discloses a period bifurcation dissipative soliton resonance pulse generation method. The method realizes period bifurcation dissipative soliton resonance pulse optical pulse output.

A system for single pass amplification of dissipative soliton-like seed pulses of 1-20 ps to produce output pulses of 50-200 fs, without requiring a stretcher. Such an amplifier relies on the inherent chirp of the seed pulse out of the oscillator instead of pulse stretching.

The invention discloses an all-optical-fiber sub-hundred-femtosecond ultrashort pulse generation apparatus with a compact structure. The apparatus comprises a dissipation soliton oscillator, an output isolation part, a pre-compression part and an amplifying and nonlinear compression part which are connected in sequence through mono-mode optical fibers; negative dispersion is introduced to the pre-compression part; the negative chirp quantity provided by the pre-compression part is less than the positive chirp quantity of input pulse; the dissipation soliton oscillator generates pulse with relatively high energy and positive chirp, and the pulse enters the pre-compression part through the output isolation part to compress the pulse width and improve the pulse peak power, and finally, the pulse energy in the amplifying and nonlinear compression part is improved; and the pulse spectrum is widened and the pulse width is compressed through the nonlinear process to obtain the sub-hundred-femtosecond ultrashort pulse. The apparatus has the all-optical-fibre structure and relatively high resistance to external environment disturbance based on a dissipation soliton optical fibre laser in a single-wall carbon nanotube locking mode and can stably output sub-hundred-femtosecond pulse for a long time.

The invention discloses a dissipative soliton and soliton dual-wavelength laser based on a dispersion compensating fiber, which includes a laser diode, a beam combiner, a gain fiber, a coupling output element, a polarization-independent isolator, a polarization-maintaining fiber, and a carbon nanotube. Dispersion compensating fiber, polarizer, first polarization controller and second polarization controller; beam combiner, gain fiber, outcoupling element, polarization independent isolator, dispersion compensating fiber, polarization maintaining fiber, carbon nanotube, first The polarization controller, the polarizer and the second polarization controller are sequentially connected by optical fibers to form an all-fiber ring cavity, and the laser diode is connected to the beam combiner as the pumping light source of the laser. The invention can realize dual-wavelength laser output of traditional solitons and dissipative solitons in the 2 μm band, has a simpler structure and lower cost, and can simply and conveniently realize dual-wavelength output mode conversion.

The invention discloses a multi-purpose bidirectional passive mode-locked all-fiber laser system, aiming to solve the technical problem that it is difficult to simultaneously output two types of ultrashort optical pulses in existing fiber lasers. The system includes a pump source (1), a wavelength division multiplexer (2), an erbium-doped gain fiber (3), a 2×2 output coupler (4), a first 3dB optical coupler (5), a second 3dB optical coupler (6), first polarization-dependent isolator (7), first polarization controller (8), second polarization-dependent isolator (9), second polarization controller (10), dispersion compensation fiber ( 11) and single-mode fiber (14). The 2×2 output coupler (4) outputs bidirectional mode-locked pulses, and its first output end (12) is connected with a single-mode optical fiber (14) outside the cavity for time-domain compression outside the cavity of the output pulses, so as to To obtain ultrashort pulses with high peak power, the second output terminal (13) directly outputs high energy dissipation soliton resonance pulses. The invention has the advantages of low cost and wide application range, and can be used as a high-peak-power femtosecond pulse light source, a high-energy picosecond and nanosecond pulse light source, and can also be used as a seed source for a high-energy pulse amplifier.

The invention provides a dual-wavelength dissipative soliton mode-locked laser, which relates to the field of laser technology and solves the problem that existing devices are realized by spatial coupling. The coupling efficiency of the system is relatively low, the spatial coupling equipment is bulky, and the system stability is poor, which is not convenient for practical use. application problem. The present invention includes a wavelength division multiplexer, a gain fiber, an isolator and a coupling output element, wherein it also includes a bandpass filter, a first polarization controller and a second polarization controller, a wavelength division multiplexer, a gain fiber, a band The pass filter, the first polarization controller, the isolator, the second polarization controller and the coupling output element are connected in sequence by optical fibers to form an all-fiber ring cavity, and the length of the gain fiber is such that it has both four-level oscillation and three-level The length of the vibration. The invention adopts a double-end pumping mode, an all-fiber ring cavity structure, a band-pass filter is inserted in the cavity, and a polarization rotation mode-locking mode is adopted to realize stable dual-wavelength laser output.

The invention discloses a dissipation soliton active mode-locking fiber laser, and relates to the field of a laser. The laser comprises a strength modulator and a code pattern generator, which are mutually connected, wherein the code pattern generator inputs pulse sequence signals to the strength modulator; and the strength modulator is used for modulating under the driving of the pulse sequence signals. The dissipation soliton active mode-locking fiber laser provided by the invention inputs the pulse sequence signals to the strength modulator by using the code pattern generator, so as to modulate laser pulse. Furthermore, the high-energy mode-locking laser pulse output can be obtained, and the center wavelength of the output laser pulse can be moved within a large range; and the output laser pulse has flexible and adjustable pulse repeat frequency, and can accurately align an external clock.