57results about How to "Wavelength tunable" patented technology

The invention discloses a nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser and belongs to wavelength tunable type femtosecond pulse lasers. The nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser comprises a pumping source and an optical fiber ring cavity, wherein the optical fiber ring cavity is formed by connecting a wavelength division multiplexer, Er-doped fibers, an optical fiber isolator, an optical fiber polarizer, an optical fiber coupler and optical fibers used in a polarization controller, the pumping source is connected with the pumping port of the wavelength division multiplexer, a public port of the wavelength division multiplexer is connected to the 80% output port of the optical fiber coupler after passing through the Er-doped fibers, the optical fiber isolator and the optical fiber polarizer in sequence, and the input end of the optical fiber coupler is connected to a signal port of the wavelength division multiplexer through the polarization controller; the optical fiber isolator is connected with the optical fiber polarizer through dispersion compensation fibers, and the other devices are connected through single-mode optical fibers. The nonlinear polarization rotary mode-locked and wavelength tunable type L-waveband femtosecond Er-doped fiber laser has the advantages that the structure is simple and reliable, maintenance is convenient, external signal modulation is not needed, self-starting mode locking can be achieved, output pulses are narrow, the working performance is excellent, cost is low, and operation is easy.

The invention relates to a low profile high performance wavelength tunable laser, wherein the tunable laser resonance cavity uses a dispersion compensation acousto-opto tunable filter. Precision and stability of the output wavelength is determined by a wavelength locker. The wavelength locker uses two beams of isolated intra-cavity laser beams, so that use of a beam splitter is avoided. Comparingwith design of ordinary beam lockers, requirement to the space is lowered, the operation is more stabilized, and the assembling is easier. The acousto-opto tunable filter has a structure that two transducers in opposite directions are welded on the same crystal for generation of two acoustic waves transmitted in opposite directions. Chromatic dispersion generated by diffusing the collimated lightby a first acoustic wave can be compensated by a second acoustic wave in the opposite direction. By using different laser gain medium, acoustic driving frequency and acousto-opto crystals, the invention can be used for manufacturing tunable laser in wavelength ranges of various kinds of applications.

The present invention relates to a dual-wavelength alternative Q-switching laser and a laser output method thereof. The laser comprises a pumping source, a Q-switching element, and a front endoscope, a laser gain medium, a polarization element and a rear endoscope which are arranged orderly. The pumping source adopts a side surface or end face pumping mode, and a light splitting module used for arranging the light separately according to the wavelengths, a polarization control element used for controlling the polarization state of the output light and a wavelength selection module used for selecting the wavelength of the output light are arranged orderly between the polarization element and the rear endoscope. The incident end and the emergent end of the wavelength selection module are respectively an incident polarization spectroscope and an emergent polarization spectroscope, and a first sub-cavity and a second sub-cavity of the wavelength selection module share the incident polarization spectroscope and the emergent polarization spectroscope and both comprise the wavelength selection holes. The laser pulse outputted by the laser has the characteristics of being able to tune the laser wavelength and the dual-wavelength spacing, etc., and the Q-switching laser pulse output of the dual-wavelength perfect coaxial controllable rapid alternative change can be realized.

The invention relates to a wavelength adjustable laser automatic inspection and control system and method. The system comprises the computer, GPIB and bus, spectral analysis, program controllable supply source, DC, temperature controller, thermoelectric cooler, laser, lens and optical fiber, with the GPIB connected to the spectral analysis and program controllable supply source, the temperature controller connected to the thermoelectric cooler which connected to the laser, light signal delivered to the spectral analysis through lens and optical fiber, and the above process is realized through instruction and data delivery with the combination of the computer, program controllable supply source, spectral analysis through the GPIB bus.

The invention discloses a 1.7[Mu]m-waveband tunable thulium and terbium-doped multi-wavelength fiber laser, which belongs to the field of lasers and aims at the problems of complexity in assembling, poor environment stability and poor practicality in the prior art. A tunable light source, an erbium-doped fiber amplifier and the port a of a first fiber coupler are successively in fiber connection; the port c of the first fiber coupler, the port d and the port g of the second fiber coupler, the port h of the third fiber coupler, the port j of the third fiber coupler and the port k of the fourth fiber coupler are successively in fiber connection; the port e of the second fiber coupler, a thulium-doped fiber, a terbium-doped fiber and the port f of the second fiber coupler are successively in fiber connection; the port i of the third fiber coupler and the port m of the fourth fiber coupler are in fiber connection; the port n of the fourth fiber coupler, a first polarization controller, the port o of fiber isolator, the port p of the fiber isolator, a second polarization controller and the port b of the first fiber coupler are successively in fiber connection; and the port l of the fourth fiber coupler is taken as laser output.

The invention provides a tunable multi-wavelength generation unit and solves the shortcoming in the prior art that a present laser outputs a fixed single wavelength. The tunable multi-wavelength generation unit comprises an input terminal and an output terminal. The input terminal is connected to one end of a light demultiplexer. The other end of the light demultiplexer is connected to the first ports of at least two light circulators. The second port of each light circulator is respectively connected to an FBG (Fiber Bragg Grating). The third port of each light circulator is respectively connected to an optical coupler. The number of the light circulators is the same with that of the FBG. Each FBG is provided on a period adjusting mechanism. The tunable multi-wavelength generation unit effectively solves the shortcoming of a fixed wavelength laser.

The invention provides an ultrashort laser pulse compression and purification device with tunable wavelength. Along with a light path forwarding direction, the device sequentially comprises a tunable optical parameter amplification system, a hollow optical fiber compression system, a secondary harmonic wave generation system and a pulse selection system, wherein the hollow optical fiber compression system comprises a reflector, a focusing lens, a vacuum pipe, a hollow optical fiber inside the vacuum pipe, a collimation lens and a dispersion compensator sequentially arranged along the light path; the hollow optical fiber is arranged in the vacuum pipe, inert gas is filled in the vacuum pipe, and gas pressure can be adjusted; the secondary harmonic wave generation system is formed by a broadband reflector and a frequency doubling crystal; the dispersion compensator is formed by a pair of quartz wedge plates; and the pulse selection system is formed by two dichroic mirrors which are arranged in parallel. By using the device, ultrashort laser pulse with tunable wavelength, high contrast, high light beam quality and period order can be acquired.

A tunable ultra-narrow linewidth optoelectronic oscillator based on a random Brillouin fiber laser is provided, comprises a first tunable laser (1), a second tunable laser (2), a coupler (3), a beam splitter (4), an intensity modulator (5), an erbium-doped fiber amplifier (6), a first circulator (7), a highly nonlinear optical fiber (8), a second first circulator (9), a single-mode optical fiber (10), a photodetector (11), a power divider (12) and a phase-locked loop system (13) which constitute a real-time feedback system so that the two lasers emitted by the two tunable lasers have a fixed and stable phase difference. The microwave signal with adjustable center frequency and narrow linewidth can be generated by using the modulating characteristic of intensity modulator, nonlinear characteristic of high nonlinear fiber, feedback characteristic of single mode fiber, wavelength tunable characteristic of tunable laser and microwave generation performance of photoelectric oscillator.

The invention discloses a wavelength width tuning single longitudinal mode laser based on a single annular cavity, and belongs to the technical field of laser. The laser comprises a pump laser, a pump collimation system, a focusing lens, a dichroic mirror, a single annular cavity, a half-wave plate, a polarization beam splitter, a light beam collimation system, a slit and a reflective diffraction grating. The reflective diffraction grating is used for realizing tunable output of laser wavelength and narrowing of line width. Self-seed injection is realized by adopting the reflective blazed grating on the basis of a single annular cavity, high-quality single longitudinal mode output is realized under the condition that a magnetic field is not added, the wavelength tuning range of the single-frequency laser is greatly expanded, the linewidth can be narrowed, the stability of output beams of the laser can be improved, and the laser has wide application prospects. And the output light beam has the advantage of low frequency and power noise. The wavelength screening is realized by adopting the diffraction order reflected by the reflective diffraction grating, and the wavelength tunable output of the single longitudinal mode laser output is realized by changing the Littrow angle and adjusting the size of the slit.

A radially or angularly polarized laser device based on optical parametric chirped pulse amplification, using a picosecond laser as a pump source, and radially or angularly polarized light as a seed source, which are divided into two beams by a beam splitter , combined and then input into the nonlinear amplifying crystal to obtain two beams of high-energy partially radially or angularly polarized light. Two beams of high-energy partially radially or angularly polarized light pass through the compressor, one beam uses a half-wave plate to rotate the polarization direction by 90°, and the other beam of high-energy non-uniform femtosecond radially or angularly polarized light uses a beam combiner Be bundled. The present invention can effectively realize the amplification of radially or angularly polarized light by using OPCPA to amplify the two paths of radially or angularly polarized light respectively and then combine them, and better maintain the properties of radially or angularly polarized light. Thus, a beam of high-energy femtosecond radially or angularly polarized light is obtained. The invention can effectively solve the problem that traditional OPCPA cannot be amplified due to uneven polarization directions of radially or angularly polarized light, and realize high-energy radially or angularly polarized laser output.

The invention discloses a wavelength-width tunable single longitudinal mode laser based on a monolithic annular cavity, which belongs to the technical field of lasers. The invention includes a pumping laser, a pumping collimation system, a focusing lens, a dichroic mirror, a single ring cavity, a half-wave plate, a polarization beam splitter, a beam collimation system, a slit, and a reflective diffraction grating. The reflective diffraction grating is used to realize tunable output of laser wavelength and narrowing of line width. The present invention uses a reflective blazed grating to realize self-seed injection on the basis of a single ring cavity, realizes high-quality single longitudinal mode output without adding a magnetic field, greatly expands the wavelength tuning range of a single-frequency laser, and can narrow the line Wide, improve the stability of the output beam of the laser, and the output beam has the advantages of low frequency and power noise. The invention adopts the diffraction order reflected by the reflective diffraction grating to realize the wavelength screening, and realizes the wavelength tunable output of the single longitudinal mode laser output by changing the Littrow angle and adjusting the size of the slit.

The present application provides a wavelength-tunable laser device, which can reduce the complexity of laser wavelength tuning. The laser includes a reflective gain unit, an optical phase shifter, a coupler and a passive filter element array, the output port of the reflective gain unit is connected to the input port of the optical phase shifter; the output port of the optical phase shifter is connected to the The input port of the coupler, the first output port of the coupler is connected to the input port of the passive filter unit array, and the second output port of the coupler is the output port of the laser; the passive filter unit array includes a plurality of passive filter units In the source filter unit, any two passive filter units in the plurality of passive filter units have different wavelength tuning ranges, and the wavelength of each filter unit is linearly adjustable. At the same moment, only one passive filtering unit among the plurality of passive filtering units performs filtering.

The invention relates to the field of lasers, in particular to a dual-frequency laser. In a tunable dual-frequency laser, a first pump beam and a second pump beam with the same power and polarization direction are incident into a microchip laser cavity at spatial intervals; and the microchip laser cavity at least comprises a front cavity lens, a laser gain dielectric slab, an etalon of an air gap, and a rear cavity lens which are sequentially glued, wherein the etalon of the air gap is formed by fixing the laser gain dielectric slab and the rear cavity lens by using two etalon supports at an interval, and a first optical plain film and a second optical plain film with the same thickness or almost same thickness are respectively inserted into a first optical path and a second optical path of the first pump beam and the second pump beam in the gap to respectively adjust the output wavelength of the laser. Therefore, in the dual-frequency laser wavelengths are tunable, and the laser is stable in working and has a small size.

The invention relates to a laser based on a semiconductor optical amplification chip. A soleplate is provided with a cover body, a lead hole is processed on the left lateral wall of the cover body, a light-emitting hole is processed on the right lateral wall of the cover body, the left side of the soleplate in the cover body is provided with a supporting block provided with a piezoelectric transducer the right side of which is provided with a total reflector, the total reflector on the soleplate is provided with a focusing lens in the right horizontal optical axis direction, the focusing lensis provided with a mode selecting device in the right horizontal optical axis direction, the mode selecting device is provided with a first collimating lens in the right horizontal optical axis direction, the first collimating lens is provided with a semiconductor optical amplification chip in the right horizontal optical axis direction; and the incoming surface of the semiconductor optical amplification chip is coated with a reflection reducing film, the outgoing surface of the semiconductor optical amplification chip is coated with a reflecting film, the semiconductor optical amplification chip is provided with a second collimating lens in the right horizontal optical axis direction, and the second collimating lens is provided with a cylinder lens in the right horizontal optical axis direction.

The invention belongs to the technical field of infrared femtosecond laser, and discloses a high-power mid-infrared tunable femtosecond laser generation device, which comprises a pumping module, an OPO (optical parametric oscillation) module, a femtosecond laser generation module, a femtosecond laser generation module and a femtosecond laser generation module, the optical parametric oscillation (OPO) module is used for converting input laser (pump light) into two low-frequency output light (signal light and idler frequency light); and the difference frequency generation (DFG) module is used for performing difference frequency on the two laser beams generated by the OPO module to generate high-power intermediate infrared tunable femtosecond laser. High-power mid-infrared tunable femtosecond laser is obtained in an OPO + DFG combined mode, tunable signal light and idler frequency light are generated by pumping the OPO through a high-power femtosecond oscillator, and the tunable signal light and the idler frequency light serve as pumping light and signal light needed by difference frequency generation respectively and are injected into a mid-infrared nonlinear crystal to obtain high-power femtosecond laser. Therefore, the output mid-infrared femtosecond laser has the characteristics of high power and tunability.

The invention provides a wavelength tunable nonlinear mirror mode-locked laser and a working method. The mode-locked laser comprises a pump light source, a collimation focusing system and an optical resonant cavity, wherein a laser crystal, a birefringence filter and a nonlinear crystal are sequentially arranged in the optical resonant cavity, the laser output wavelength is changed by rotating theangle of the birefringence filter, the phase of the frequency multiplication process is matched by adjusting the nonlinear crystal, and mode-locked laser output is achieved. The problems that an existing tunable ultrafast laser is low in damage threshold value, low in output power and complex in preparation are solved, and high-power wavelength-tunable ultrafast laser output can be obtained.