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 cascade long-period pohotonic crystal fiber grating temperature sensor. A photonic crystal fiber is provided with a cladding consisting of periodically arrayed air holes; the cladding and a fiber core of the fiber are made of SiO2; a long-period grating with a certain period is written onto the fiber; the air holes of the cladding are filled with thermosensitive substances sensitive to temperature; the refractive indexes of the thermosensitive substances are less than the refractive index of the fiber core; and the total internal reflection photonic crystal fiber is formed. The effective refractive index of a coupled mode of the grating can be changed by controlling the temperatures of the thermosensitive substances, so that the resonant wavelength of a transmission spectrum of the grating is changed, the temperature variation is shown as spectral shift, and the wavelength-tunable temperature sensor is realized. As the bandwidth of the transmission spectrum of the single long-period grating is greater, the temperature sensitivity and the measurement precision of the transmission spectrum of the long-period grating are limited, and the sensor is transformed into a cascade long-period grating structure. The sensor achieves the tunable wavelength, the sensitivity is improved, and the sensor has a very large application prospect in the transduction field.

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 random fiber laser system with tunable wavelength, belonging to the laser device field. According to the system, first pump source laser with tunable wavelength and a series of low energy seed source laser are injected into a fiber, through a series of Raman amplification effects, distributed Raman amplification light is generated in a transmission fiber, and distributedRayleigh backward diffusion light forms random laser after Raman amplification. A random laser in the invention can realize continuous tunable wavelength. In a selectable scheme, after first Raman amplification, residual energy of a first pump source or a first seed source is fed back to the fiber for reuse, and slope efficiency of a finally formed random laser is raised. The system can control aRaman gain and a shape of a Raman gain spectrum through additional seed light, reduce a threshold of the laser, and raise output power.

The invention relates to a single longitudinal mode distributed feedback optical fibre laser with tunable wavelength. Ultraviolet silica gel for phase shift optical fibre grating is fixed at the bottom of a V-shaped aluminum groove which is affixed on a heat sink plate by using heat conducting silica gel; the heat sink plate is tightly arranged on a semiconductor refrigerating plate through heat conducting materials; the lower surface of the semiconductor refrigerating plate is in close contact with the radiating plate through a layer of heat conducting materials; the positive and negative ends of the semiconductor refrigerating plate are connected to a linear power supply through a lead; one end of the phase shift optical fibre grating is connected with a combiner port of a 980 / 1030 wavelength division multiplexer; a port 980 of the wavelength division multiplexer is connected with a tail fibre of the semiconductor laser; a port 1030 of the wavelength division multiplexer is connected with an optical fibre jumper head of a slope; the other end of the phase shift optical fibre grating is connected with an optical fibre isolator; and the contact surfaceof the heat sink plate and air and the contact surface of the V-shaped aluminum groove and air are all covered by heat insulation cotton. The laser has the characteristics of tunable wavelength, stable output of single longitudinal mode and miniaturization.

The invention discloses a narrow-linewidth mode-locking thulium-doped fiber laser with a high repetition rate, which belongs to the technical field of fiber lasers. In order to improve the repetitionrate outputted by the passive mode-locking thulium-doped fiber laser, a pumped laser is connected with an erbium ytterbium co-doped fiber amplifier; the erbium ytterbium co-doped fiber amplifier is connected with a wavelength division multiplexer, and the wavelength division multiplexer is connected with a thulium-doped fiber; the thulium-doped fiber is connected with an isolator, and the isolatoris connected with a filter; the filter is connected with an output coupler, and output light is outputted through the output coupler; the output coupler is connected with a single-mode fiber, the single-mode fiber is connected with a second polarization controller, the second polarization controller is connected with a polarizer, the polarizer is connected with a first polarization controller, and the first polarization controller, the polarizer and the second polarization controller are used as mode-locking elements to realize nonlinear deflection effect passive mode-locking; and the first polarization controller is connected with the wavelength division multiplexer to form a ring cavity. The narrow-linewidth mode-locking thulium-doped fiber laser with a high repetition rate is applicable to fields of optical communication, spectroscopy, precision optical sampling and other technologies.

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 discloses a solid-state laser with a dual-composite-resonant-cavity structure and tunable wavelength. The laser enables unpolarized 1064.2nm simulated radiation fluorescence generated by Nd:YAG crystals to pass through a first resonant cavity and a second resonant cavity to realize s-polarized 1064.2nm pumped laser and p-polarized 1064.2nm fundamental frequency light oscillation respectively; the s-polarized 1064.2nm pumped laser pumps a third resonant cavity to generate s-polarized signal light with tunable wavelength and middle-infrared band s-polarized idler frequency light; and the s-polarized signal light with tunable wavelength and the p-polarized 1064.2nm fundamental frequency light perform sum-frequency mixing to form s-polarized sum-frequency laser with tunable orange red band wavelength. By adoption of the laser disclosed by the invention, wavelength-turnable and high-power laser output at the orange red band and the middle-infrared band can be realized at the same time; and the laser is compact in structure, high in energy conversion efficiency, and can be widely applied to the fields of biomedicine, laser measurement, pollution monitoring, spectral analysis and the like.

The invention discloses a semiconductor laser, which comprises a semiconductor PN junction, and a surface active Bragg reflection grating, a ridge-shaped waveguide array, a multimode interference waveguide and a super-symmetric array waveguide which are arranged on the semiconductor PN junction and distributed along the same column, the surface active Bragg reflection grating is arranged at one end of the ridge-shaped waveguide array, one end of the multimode interference waveguide is adjacent to the other end of the ridge-shaped waveguide array, and the super-symmetric array waveguide is adjacent to the other end of the multimode interference waveguide. According to the semiconductor laser, the surface active Bragg grating is used for providing single-frequency laser with tunable wavelength, the ridge-shaped waveguide array is used for gain amplification, the multimode interference waveguide is used for coherent coupling, and finally, the super-symmetric array waveguide is used for secondary transverse mode selection and gain. And high-power, narrow-linewidth and wavelength-tunable high-beam-quality laser is realized.

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.

The invention discloses a feedback enhancement type polarization-maintaining erbium-doped fiber dual-wavelength random laser. The laser comprises a pump laser light source, an optical fiber wavelengthdivision multiplexer, a first optical fiber polarization controller, a first optical fiber polarization beam combiner, a polarization-maintaining erbium-doped optical fiber, a second optical fiber polarization beam combiner, an optical fiber laser, a first optical fiber coupler, a second optical fiber polarization controller, a first optical fiber isolator, a third optical fiber polarization controller, an electro-optical modulator, an arbitrary waveform generator, a fourth optical fiber polarization controller, a second optical fiber isolator, a second optical fiber coupler and the like. According to the random laser, a random Brillouin dynamic grating is generated in one axis of the polarization-maintaining erbium-doped optical fiber, and pumping is carried out in the other axis of thepolarization-maintaining erbium-doped optical fiber. The random Brillouin dynamic grating enhances the random feedback of the polarization maintaining optical fiber, so that random laser output is generated on the two axes of the polarization maintaining optical fiber, and the random laser has the advantages of the high integration level, the low threshold value and high conversion efficiency.

The invention relates to a device for generating wavelength-tunable ultra-short visible and near-infrared laser pulses simultaneously. The device comprises a femto second laser, a tunable secondary non-linear optical parameter amplification system, a chirp mirror-prism pair compression system and a super-continuous near-infrared white light generation system, a light beam output by the femto second laser is divided into two light beams by the tunable secondary non-linear optical parameter amplification system, one light beam is amplified and enters the chirp mirror-prism pair compression system, and the other light beam directly enters the super-continuous near-infrared white light generation system. According to the device, wavelength-tunable visible laser pulses of high light beam quality and periodic quantity level as well as near-infrared ultra-short laser pulses of the high light beam quality can be obtained simultaneously.

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 present invention provides a delay feature inhibition chaotic signal generation device. The device comprises a delay feature inhibition chaotic signal generation module and a collection and analysis module; optical signals, output from a WRC-FPLD, of the delay feature inhibition chaotic signal generation module are divided into two branches through an optical fiber coupler, the two branches are finally combined and input into the optical fiber coupler to form two filtering external cavity feedback loops, and the central wavelengths of adjustable filters in the two external cavities are regulated to allow the laser to output chaotic signals with different wavelengths; the cavity lengths of the two external cavity feedback loops are regulated to allow the difference of the cavity lengthsto be equal to half of the laser relaxation vibration time so as to achieve output of delay feature inhibition chaotic signals with tuning wavelengths; and the collection and analysis module collectsthe output signals of the chaotic signal generation module to regulate the working temperature and the working current of the WRC-FPLD. The delay feature inhibition chaotic signal generation device employs the WRC-FPLD as a laser source to achieve output of chaotic signals with different wavelengths so as to facilitate application in the WDM communication system.

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 broadband wavelength tunable mid-infrared Raman fiber laser includes a tunable fiber laser unit, a fiber amplifier unit, a collimating coupling unit and a Raman laser resonator unit, the Raman laserresonator unit includes a grating, the tunable fiber laser unit outputs laser light of a preset first band to the fiber amplifier unit, and after the laser light of the first wave band passes throughthe optical fiber amplifier unit to amplify the optical power, the laser light is input tothe collimating coupling unit; the collimating coupling unit couples the laser light after the optical poweramplification to the Raman laser resonator unit. The Raman laser resonator unit outputs the Raman laser light with the preset second wavelength band by adjusting the tilt angle of the grating based onthe laser light after the optical power amplification. As a grating exists in the Raman laser resonator unit, the wavelength of the Raman laser output can be adjusted by adjusting the tilt angle ofthe grating, so that the application field of the laser can be greatly expanded.

The invention provides a filter drive circuit of a swept source. The filter drive circuit of the swept source comprises a signal generating circuit, a filter circuit, a gain adjusting circuit and a filter load, wherein the signal generating circuit is used for generating sine wave signals, an input end of the filter circuit is connected with an output end of the signal generating circuit, the filter circuit is used for filtering noise beyond a sine wave signal band, an input end of the gain adjusting circuit is connected with an output end of the filter circuit, an output end of the gain adjusting circuit is connected with the filter load, and the gain adjusting circuit is used for amplifying the mixed wave form of the sine wave signals and narrow band noise. According to the filter drive circuit of the swept source, output frequency of the swept source can be continuously adjustable between 20 KHz and 200 KHz, peak-to-peak value voltage can be 3 V, phase is adjustable, and output load is about 1 omega. Filter load stability is guaranteed, the requirements on modulation amplitude of different laser devices are met, and sweep frequency laser wavelength can be coordinated.

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 provides a wavelength-adjustable all-fiber nanosecond pulse laser device based on a photonic crystal fiber and a system. The laser device comprises a pump light input unit, an isolator,a wavelength tuning unit, a high-nonlinearity optical fiber and a laser output unit which are sequentially connected through optical fibers, wherein the pump light input unit is connected with the laser output unit through the optical fiber, the pump light input unit is further connected with an external pump light source and is used for obtaining the pump light, coupling the pump light and then obtaining signal light, the isolator is used for ensuring laser operation unidirectionality, the wavelength tuning unit comprises a first polarization controller, a photonic crystal fiber and a secondpolarization controller which are sequentially connected through the optical fibers, the high-nonlinearity optical fiber is used for improving nonlinearity and dispersion of the signal light, and thelaser output unit is used for obtaining and outputting ultrafast pulse laser based on the signal light. The laser device is simple in structure, small in size and suitable for various application occasions such as communication.

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.

The invention discloses a multi-wavelength ring laser chip which comprises a chip substrate, a chip lower wrapping layer, a passive waveguide core layer and an active waveguide core layer. A periodic wavelength selection function of the array waveguide grating is utilized, the array waveguide grating, a plurality of active waveguide amplifiers and a tunable filter are subjected to monolithic integration, so that a corresponding multi-wavelength and wavelength-tunable light source is obtained, and the scheme can generate stable and synchronous multi-wavelength oscillation under the condition of no complex wavelength control; the multi-wavelength laser chip not only meets the wavelength requirement of a wavelength division multiplexing communication band, but also has the greater advantages of being high in integration level, small in size, tunable in wavelength, and high in reliability and environmental adaptability.