31 results about "Regenerative amplifier" patented technology

The invention discloses a method and a device for outputting large-energy picosecond pulse laser with external synchronization picosecond-level jitter. The device comprises a high-precision time sequence controller, a semiconductor picosecond pulse seed source, an optical isolator and a high-gain and high-stability regenerative amplifier. The semiconductor picosecond pulse seed source outputs low-energy picosecond-level (10-12J, pJ) and low-jitter picosecond-level (10-12s, ps) picosecond pulse seeds under the trigger of a time sequence controller of a high-precision external clock, the picosecond pulse seeds enter the high-gain high-stability regenerative amplifier through the optical isolator, and the high-gain high-stability regenerative amplifier outputs high-energy picosecond-level (10-12s, ps) picosecond pulse seeds under the control and adjustment of the high-precision time sequence controller. The picosecond pulse seed is locked to be regenerated and amplified in the regenerative amplifier, and the energy of the picosecond pulse seed with low energy and low jitter at a picofocus (pJ) level is amplified to uJ-mJ (10 <-6 > J-10 <-3 > J), so that low jitter and large energy output of laser pulses and trigger signals are realized, and application development of high-precision laser ranging, laser communication, time-frequency transmission and the like is effectively promoted.

The invention relates to the technical field of laser, and provides a high-power pulse width repetition frequency tunable laser, which comprises an input and output light path configured to input seed light and output amplified laser; a regenerative amplifier optical path configured to amplify the input seed light; and the pulse width compression module is configured to perform pulse width compression on the amplified seed light and output high-power pulse laser with tunable pulse width, and the pulse width compression module comprises a third polarizing beam splitter, a third 1 / 2 wave plate, a first electric control transverse movement plane mirror, a second electric control transverse movement plane mirror, a nonlinear crystal and a fourth plane mirror. On the basis of a nonlinear crystal multi-pass compression method, a high-power disc laser is built, pulse width compression is carried out on an annular cavity which contains a nonlinear crystal and a 1 / 2 wave plate or is added into a Pockels cell, and a high-power pulse width repetition frequency tunable pulse string is finally obtained by transversely moving a plane mirror through electric control.

The present invention provides a thin-film dual-pulse-width output laser, comprising: a femtosecond laser; a polarization beam splitting module for splitting the laser pulses output by the femtosecond laser into two laser beams; one of the laser beams is sequentially introduced into a first regenerative amplifier through a first reflector, a first thin-film polarizer, a first Faraday rotator, a first half-wave plate and a first polarizer, oscillated and amplified therein, and then output after dispersion compensation by a first dispersion grating; the other laser beam is broadened to 2.7 ps by a second chirped volume Bragg grating, and then sequentially introduced into a second regenerative amplifier through a second reflector, a second thin-film polarizer, a second Faraday rotator, a second half-wave plate and a second polarizer, oscillated and amplified therein, and then output after dispersion compensation by a second dispersion grating. A laser output method is also provided. Dual-pulse-width lasers can be output simultaneously in the above device and method.

The application discloses a disk medium high-energy ultra-short pulse laser regenerative amplifier based on CPA technology, comprising: a femtosecond laser seed light source for providing femtosecond seed light; a chirped Bragg fiber grating for expanding the femtosecond seed light into nanosecond laser pulses; an optical coupling input and output device for coupling input of the nanosecond laser pulses and coupling output of the nanosecond laser pulses after amplification processing; a regenerative amplification laser cavity for regenerative amplification processing of the coupled-in nanosecond laser pulses; the optical coupling input and output device comprises a fiber coupling collimation module, an optical isolator, a first 1 / 2 wave plate and a thin film polarizer; the regenerative amplification laser cavity comprises a Pockels cell, a second 1 / 2 wave plate, a first reflection module, a second reflection module, a first telescope module, a second telescope module, a first disk gain medium, a second disk gain medium and a third reflection module; the regenerative amplifier can realize high-repetition-frequency and high-pulse-energy laser pulse output.

The invention provides an ultrashort pulse laser ceramic grading method and equipment for realizing the method. The method comprises the following steps: a) adopting an ultrashort pulse laser beam which is generated by a specific SESAM passive mode-locking seed laser and a regenerative amplifier and has the pulse width of 1-15 ps and the monopulse energy of 10 mu J-1 mJ; b) focusing the ultrashort pulse laser beam into a processing light spot with the light spot diameter of 5-50 microns through a light beam shaping transmission module; c) controlling the focused laser beam to perform grain-dividing path processing on the surface of the ceramic workpiece at a scanning speed of 10-1000 mm / s to realize grain-dividing joint cutting with a depth-to-width ratio of more than 10: 1; according to the method, the energy difference between single pulses is smaller than or equal to + / -2%, the difference of peak power between the pulses is smaller than or equal to + / -3%, and the method is stable in working performance, high in consistency, short in action time / low in damage and high in machining precision.

Wavelength-tunable source of pulsed laser radiation for VIS-NIR spectroscopy which consists of a pump source (1) forming bursts of picosecond pulses of high pulse repetition rate, and a synchronously pumped optical parametric oscillator (2). The pump source (1) comprises a solid-state regenerative amplifier (31) having one or two electro-optical switches (32,33) inside its resonator (44). The switches create partial transmission of the resonator for a time interval longer than a resonator roundtrip time, and eject a part of energy of a pulse circulating inside. Bursts of 5-10 ns duration are formed, which are filled with high peak power picosecond pulses. Pulse repetition rate of the order of GHz of pump pulses allows the construction of a compact optical parametric oscillator. The whole set of parameters ensures high energy efficiency, stability and an ability to provide output pulse bursts repeating at up to 10 kHz repetition rate.

The present invention discloses a seed-injected single-frequency laser without resonant cavity locking and a control method thereof, belonging to the field of laser technology. The seed-injected single-frequency laser includes a Pockels cell timing controller and a ring cavity regenerative amplifier consisting of a first thin-film polarizer, a second wave plate, a first Pockels cell, a second Pockels cell, a second thin-film polarizer, a third reflector, a first stacked pump module, a second stacked pump module, a fourth reflector, a fifth reflector, a laser crystal, and a sixth reflector, arranged in sequence along an optical path. The first stacked pump module and the second stacked pump module are arranged between the fourth reflector and the fifth reflector and are alternately arranged above and below the laser crystal. The Pockels cell timing controller is electrically connected to the first Pockels cell and the second Pockels cell, respectively. The present invention ensures that the laser frequency oscillating within the ring cavity is completely consistent with the seed light and is not affected by the stability of the ring cavity length.

The application discloses a kind of based on wedge structure's ultrafast pulse hybrid cavity slab regenerative amplifier, including femtosecond seed laser, stretching unit, shaping unit, laser isolation unit, pulse selection unit, wedge slab regenerative amplification unit, compression unit;The shaping unit is used to shape seed in x, y direction, so that seed realizes round trip oscillation in hybrid cavity;The wedge slab regenerative amplification unit is constituted by trapezoidal slab crystal and two plane mirrors, which can make seed laser realize high-density folding arrangement inside slab crystal, while realizing self-folding return;The pulse selection unit is used to select frequency to seed, while the selected single pulse is limited in wedge slab regenerative amplification unit, to realize the regenerative amplification of seed.Compared with the traditional stable cavity regenerative amplifier, the hybrid cavity slab regenerative amplifier of the application can provide larger fundamental mode volume and good heat dissipation performance, and is more conducive to realizing high-power, high-beam-quality ultrafast pulse laser output.

The invention discloses a seed injection single-frequency laser with a resonant cavity not needing to be locked and a control method of the seed injection single-frequency laser, and belongs to the technical field of lasers. The annular cavity regenerative amplifier is composed of a first thin film polaroid, a second # imgabs0 # wave plate, a first Pockels cell, a second Pockels cell, a second thin film polaroid, a third reflector, a first stack pumping module, a second stack pumping module, a fourth reflector, a fifth reflector, a laser crystal and a sixth reflector which are sequentially arranged along a light path transmission sequence; the first stack pumping module and the second stack pumping module are arranged between the fourth reflecting mirror and the fifth reflecting mirror and are arranged at the upper position and the lower position of the laser crystal in a staggered manner; and the Pockels cell time schedule controller is electrically connected with the first Pockels cell and the second Pockels cell respectively. According to the invention, the laser frequency oscillated in the annular cavity is completely consistent with the seed light and is not influenced by the cavity length stability of the annular cavity.

The present invention relates to the field of solid ultrafast lasers, and particularly to a regenerative amplifier and method for increasing the output power by intracavity excitation of high-order modes, including a ytterbium-doped fiber oscillator, a pulse stretcher, a crystal regenerative amplifier module, and a pulse compressor arranged in the optical path sequence; the ytterbium-doped fiber oscillator is used to generate initial laser pulses; the pulse stretcher is used to broaden the initial laser pulses; the crystal regenerative amplifier is used to amplify the laser pulses; the pulse compressor is used to compress the amplified laser pulses; by rotating the pump-end mirror, the pump light is obliquely incident into the crystal, so that an angle is formed between the pump light and the seed light, thereby exciting high-order modes to increase the output power and output fundamental mode spot.

The present invention discloses a femtosecond laser chirped pulse self-similar regenerative amplification method and device. The device includes a broadband seed source, a spectral shaping and broadening device, a self-similar regenerative amplifier, and a pulse compressor that are sequentially arranged from one side to the other side according to the optical path. The spectral shaping and broadening device includes a time-domain broadening device and a spectral shaper. The time-domain broadening device is used to broaden the seed pulse to the picosecond level or even the nanosecond level and finely regulate the pulse width. The spectral shaper is used to perform spectral shaping on the seed pulse so that the spectral intensity of the broadened seed pulse is a saddle-shaped chirped pulse with high intensity at both sides and low intensity in the center. The self-similar regenerative amplifier includes a gain crystal and a highly nonlinear crystal. After the saddle-shaped chirped pulse is injected into the self-similar regenerative amplifier, it undergoes nonlinear spectral broadening and amplification multiple times back and forth and outputs a high-energy chirped pulse to the pulse compressor.

The invention relates to a three-wavelength picosecond laser system, which comprises a first laser generating module, a second laser generating module and a third laser generating module, the second laser generating module is arranged at the downstream of the light path of the first laser generating module, and the second laser generating module receives the first picosecond laser and converts the first picosecond laser into second picosecond laser; the third laser generation module is arranged at the downstream of the light path of the second laser generation module and comprises a regenerative amplifier which takes emerald as a gain medium; the regenerative amplifier is pumped by the second picosecond laser and is used for generating and amplifying third picosecond laser; the traveling wave amplifier is arranged at the downstream of the light path of the regenerative amplifier and is used for receiving and further amplifying the energy of the third picosecond laser; and the wavelength selection output module is used for selectively outputting the first picosecond laser, the second picosecond laser and the third picosecond laser amplified by the traveling wave amplifier.

The present disclosure relates to a laser system comprising: a mode-locked oscillator or laser configured for generating seed laser pulses; a nonlinear crystal configured for frequency doubling the seed laser pulses from the oscillator, whereby modified laser pulses are obtained; a pulse stretcher, such as a chirped fiber-Bragg grating (CFBG), configured for temporally stretching the modified laser pulses, whereby stretched laser pulses are obtained; a regenerative amplifier configured for amplifying the stretched laser pulses, whereby amplified laser pulses are obtained, wherein the regenerative amplifier comprises a gain crystal selected from the group of chromium-doped Colquiriite crystals (Cr:Colquiriites) and Alexandrite crystals; and a compressor for temporally compressing the amplified laser pulses, whereby compressed pulses are obtained.

The invention discloses a regenerative amplifier based on a slab medium and a double-end pumping configuration, and belongs to the technical field of laser technologies and photoelectric devices. The regenerative amplifier comprises a seed source, a modulator, an amplifier, an isolator, a polarization control element, an electro-optic Q-switched crystal, a slab laser crystal, a double-end pumping system and a resonant cavity structure. The amplifier adopts the lath gain medium, heat sinks are bonded on the upper surface and the lower surface to improve the heat dissipation efficiency, the pump light is uniformly distributed in the crystal in combination with a double-end symmetric pumping mode, and the energy utilization rate and the light beam quality are improved. Seed light reciprocates in the resonant cavity for multiple times, and after multi-pass amplification and energy accumulation, cavity emptying is achieved through electro-optical Q-switching control, and high-peak-power laser pulses are output. The problems that a traditional regenerative amplifier is serious in heat effect, uneven in gain, limited in output power and the like are effectively solved, and the regenerative amplifier is suitable for the high-energy laser application fields such as laser micromachining and ultrafast spectrums.

The application discloses a short pulse regenerative amplifier based on spectrum shaping, and belongs to the technical field of femtosecond lasers.The short pulse regenerative amplifier comprises a seed light source, a spectrum shaping system, a broadening module, an amplification module and a pulse compression module which are sequentially arranged along an optical path, the seed light source is used for outputting an initial pulse light beam, the spectrum shaping system is used for performing nonlinear effect spectrum broadening and collimation shaping on the initial pulse light beam, the broadening module is used for sequentially adjusting the pulse light beam into vertical polarization light and horizontal polarization light, and the pulse time domain width of the vertical polarization light is broadened to the order of 100 ps, the amplification module is used for extracting gain through multiple rounds of back-and-forth of the incident horizontal polarization light, and outputs an amplified pulse light signal, the laser gain energy in the amplification module is controlled by a gain energy adjusting module, and the pulse compression module is used for compressing and exporting the amplified pulse light signal.The application eliminates the influence of gain narrowing in the amplification process, obtains an amplified pulse with a wider spectrum, and the compressed pulse width is less than 100 fs.

The application discloses a high-contrast pico-second laser device and a control method thereof. The first cavity mirror of an oscillator is installed on a mirror frame through a first piezoelectric ceramic, and the second cavity mirror is installed on the mirror frame through a second piezoelectric ceramic. For long-time locking of the laser cavity length, the long-time cavity length drift of the laser cavity length will exceed the range of the piezoelectric ceramic. The second piezoelectric ceramic can high-precision synchronize the time of the pump pulse and the seed pulse in the crystal of the parametric amplifier. The stepping motor can solve the long-time drift problem of the pump pulse and the seed pulse. When the expansion and contraction amount of the second piezoelectric ceramic will exceed the limit of the second piezoelectric ceramic, a large delay is introduced through the movement of the stepping motor, so that the voltage on the second piezoelectric ceramic returns to the middle value. The long-time cavity length drift of the regenerative cavity is compensated by using the electric translation stage based on the stepping motor, and the repetition frequency of the regenerative amplifier can be locked to the signal frequency after the frequency division of the oscillator repetition frequency electrical signal for a long time.

The application discloses a regenerative amplifier based on a slab medium and a double-end pumping configuration and belongs to the technical field of laser technology and optoelectronic devices. The regenerative amplifier comprises a seed source, a modulator, an amplifier, an isolator, a polarization control element, an electro-optical Q-switching crystal, a slab laser crystal, a double-end pumping system and a resonant cavity structure. The amplifier adopts a slab gain medium, improves the heat dissipation efficiency through the bonding of upper and lower surfaces with heat sinks, uniformly distributes pumping light in the crystal by combining a double-end symmetric pumping mode, and improves energy utilization and beam quality. Seed light repeatedly goes back and forth in the resonant cavity, accumulates energy after multi-pass amplification, and realizes cavity emptying output of high peak power laser pulses through electro-optical Q-switching control. The application effectively solves the problems of the traditional regenerative amplifier, such as serious thermal effect, uneven gain and limited output power, and is suitable for high-energy laser application fields such as laser micro-processing and ultrafast spectroscopy.

The application discloses a method and device for improving the spontaneous emission time contrast of femtosecond laser pulses. The device comprises a titanium sapphire femtosecond laser oscillator, a laser pump source, a stretcher, a regenerative amplifier, an electro-optical switch, a compressor and the like. The low-energy pulses output by the femtosecond laser oscillator are time-domain stretched by the stretcher, and then are sent into the regenerative amplifier for amplification. At this time, the transmittance of laser pulses of different wavelengths in the ring cavity is adjusted by adjusting the incident angle of the laser into the spectrum shaping filter in the ring cavity, so as to suppress the spontaneous emission in the cavity and improve the spontaneous emission time contrast of the amplified light. Subsequently, the electro-optical switch is controlled to make the amplified light enter the pulse compressor, and finally the femtosecond laser pulses with high energy and high time contrast are generated. The application improves the spontaneous emission time contrast of femtosecond laser pulses by spectrum shaping filtering in the ring cavity of the amplifier, and can also effectively suppress the spectral red shift and gain narrowing of the amplified light, and output the amplified light with a wide spectrum.

The invention provides a dual-wavelength picosecond ultrafast laser skin therapeutic instrument which is characterized in that a main machine is composed of a picosecond laser and the like, a light guide system comprises a light guide arm and a therapeutic handle, and the picosecond laser is arranged in the main machine and comprises an SESAM passive mode-locking seed laser, a regenerative amplifier and a light beam transmission module; the seed laser adopts a resonant cavity arranged in a double-Z shape to obtain stably-output mode-locked picosecond laser, and after the mode-locked picosecond laser is amplified by a regenerative amplifier doubled by the resonant cavity, the mode-locked picosecond laser generates 1064 nm fundamental frequency light and 532 nm frequency doubling light through a nonlinear crystal LBO for dual-wavelength output. And then the light passes through a beam expanding system, a dichroic mirror group and a 532 nm / 1064 nm dual-band beam combiner, so that the dual-wavelength output light spot with the diameter of 0.01-5 mm is continuously adjustable. The laser skin therapeutic instrument is compact in structure, the obtained mode-locked pulse is stable, and the quality of the amplified light beam is high.

The present invention belongs to the field of laser technology, and specifically relates to a regenerative amplifier with a lens that compensates for the thermal lens effect of titanium sapphire. The amplifier comprises a seed light source, a gain medium, a pump source, and a seed light reflector system. The pump light generated by the pump source is used to excite the gain medium, providing energy for amplifying the seed light generated by the seed light source. The seed light reflector system is arranged on the optical path of the seed light to amplify the seed light by causing the seed light to pass through the gain medium multiple times through reflection. The amplifier also comprises a compensation lens arranged on the optical path of the seed light to pass the seed light amplified by the gain medium through the compensation lens, thereby reducing the influence of the thermal lens effect of the gain medium on the amplified seed light. That is, the present invention only requires the arrangement of a compensation lens on the optical path of the seed light to achieve the effect of avoiding the influence of the thermal lens effect of the gain medium on the seed light. Compared with the liquid nitrogen cryogenic refrigeration of the prior art, the amplifier is very simple and convenient, and is easy to control, adjust, and maintain later.

This application relates to the field of laser technology. This application provides a high-power pulse width and repetition rate tunable laser, including: an input / output optical path configured to input seed light and output amplified laser light; a regenerative amplifier optical path configured to amplify the input seed light; a pulse width compression module configured to compress the pulse width of the amplified seed light and output high-power pulsed laser with tunable pulse width. The pulse width compression module includes: a third polarization beam splitter, a third half-wave plate, a first electrically controlled laterally moving plane mirror, a second electrically controlled laterally moving plane mirror, a nonlinear crystal, and a fourth plane mirror. Based on the multi-pass compression method of the nonlinear crystal, the present invention constructs a high-power disk laser, which contains a nonlinear crystal and a half-wave plate or a ring cavity with a Pockels cell for pulse width compression, and finally obtains a high-power pulse width and repetition rate tunable pulse train through the electrically controlled laterally moving plane mirror.

The application provides a kind of dual-wavelength picosecond ultrafast laser skin treatment instrument, host computer is composed of picosecond laser, light guide system includes light guide arm and treatment handle, the picosecond laser is built into host computer, it includes SESAM passive mode-locked seed laser, regenerative amplifier and beam transmission module;The seed laser adopts the resonant cavity arranged in double Z shape, obtains the stable output mode-locked picosecond laser, is amplified after doubling regenerative amplifier through nonlinear crystal LBO to generate 1064 nm fundamental frequency light and 532 nm frequency-doubled light dual-wavelength output;After expansion system, dichroic mirror group and 532 nm / 1064 nm dual-band beam combiner, the dual-wavelength output spot diameter 0.01-5 mm continuous adjustable is realized.The laser skin treatment instrument of the application is compact in structure, the mode-locked pulse obtained is stable, and the amplified beam quality is high.

The application discloses a high-energy femtosecond disc laser amplifier and a method for inhibiting spectral gain narrowing, accurate pre-shaping of seed light spectrum, pre-amplification of seed energy by a large-mode-area photonic crystal fiber, optimization of a disc regenerative cavity into a three-way structure to compensate gain, effective spectral broadening and high-quality compression of pulses, and stable output of high-energy and narrow-pulse-width femtosecond laser. A single-mode fiber seed source generates nanosecond single-mode pulse laser at a 1030 nm band and a megahertz repetition frequency; a photonic crystal fiber laser amplifier pre-amplifies pulse energy to a microjoule level and maintains single-mode output and high beam quality of laser; a spectral shaper performs hole-digging type pre-shaping on the spectrum of the pre-amplified pulse laser to inhibit severe spectral gain narrowing in the subsequent amplification process; a high-gain disc regenerative amplifier amplifies pulse energy from nanojoules to hundreds of millijoules and outputs pulses at a kilohertz repetition frequency; and a pulse compressor compresses the amplified pulses to a hundred femtosecond level.

The present invention discloses a laser multi-pass regenerative amplification device and method. The device includes at least an oscillator, a pulse selector, and a multi-pass regenerative amplifier. A single laser pulse output by the oscillator is selected by the pulse selector at a set repetition frequency to enter the multi-pass regenerative cavity of the multi-pass regenerative amplifier. Polarization control is used to cause the selected laser pulse to travel back and forth through the multi-pass regenerative cavity four or six times for amplification through the laser gain medium. Adjusting the high-voltage duration of the pulse selector allows the selected laser pulse to be output from the multi-pass regenerative cavity after obtaining 4N or 6N times of gain amplification; N is the high-voltage duration divided by the time it takes the pulse to travel back and forth between the regenerative cavity and the laser. In the present invention, the multi-pass regenerative cavity design increases the number of amplifications of the laser pulse in a single round trip, thereby reducing the number of gain cycles required for saturation amplification and thereby increasing the repetition frequency of the regenerative amplifier. This can effectively improve gain extraction during the laser pulse regenerative amplification process.

The application relates to a femtosecond laser and a method for generating GHz Burst high-energy laser pulse clusters; the method solves the problems of complex structure and high technical difficulty of the existing laser pulse cluster generation method; the laser comprises a seed light source, a half-wave plate arranged on an outgoing light path of the seed light source, a first polarization beam splitter, an electro-optic pulse selection system and a second polarization beam splitter, a first laser isolation system and a pulse expansion system are arranged on a transmission light path of the second polarization beam splitter; a third polarization beam splitter is arranged on a reflection light path of the second polarization beam splitter, a second laser isolation system is arranged on a reflection light path of the third polarization beam splitter, a regenerative amplifier is arranged on an outgoing light path of the second laser isolation system, a first 1 / 4 wave plate and a pulse compression system are arranged on the transmission light path of the third polarization beam splitter; and the application further provides a method for generating laser pulse clusters.

The utility model discloses a nanosecond laser regenerative amplifier with adjustable pulse width. The nanosecond laser regenerative amplifier comprises a seed source, a collimation and optoisolator, a regenerative amplifier and an electric control system, the electric control system is respectively connected with the seed source and the regenerative amplifier, the seed source is used for outputting seed laser, the seed laser is incident into the regenerative amplifier after passing through the collimator and the optical isolator, and the regenerative amplifier is used for carrying out gain amplification on the seed laser and outputting the seed laser. According to the utility model, the semiconductor laser is used as a seed source, so that the pulse width of the output laser can be continuously adjusted, and the problem that the pulse width of the traditional seed source cannot be adjusted is solved; the method provides possibility for laser application in the scientific research, medical treatment and industrial fields such as fluorescence lifetime imaging, laser-induced breakdown spectroscopy, laser surface treatment, laser processing, laser annealing, terahertz generation and the like.

The invention relates to the technical field of laser, and provides a multi-order vortex light regeneration amplification device based on an adjustable defect mirror, an input and output light path comprises seed light, a first polarization beam splitter, a Faraday rotator, a 1 / 2 wave plate and a plane mirror, and a regeneration amplifier light path comprises pump light and a regeneration amplifier cavity with the defect mirror, the regenerative amplifier cavity with the defect mirror comprises a second polarizing beam splitter, a 1 / 4 wave plate, a Pockels cell, a concave reflector, the defect mirror, a crystal module, a dichroscope and a focusing lens. By using the defect mirror and controlling the radius of the incident vortex light, the size of the defect on the defect mirror and the position of the defect mirror, the generation of vortex light with different orders can be realized, and the defect-light beam ratio is adjustable, so that the order of the eigenmode vortex is flexibly controlled.

This invention discloses a solid-state dual-pass amplification system based on antiresonant hollow fiber, belonging to the field of laser technology. It includes at least a laser seed source, fiber pre-amplification, a pulse selector, fiber main amplification, a rod-shaped crystal amplification unit, a hollow fiber transmission unit, and a compression unit. The laser seed source, after frequency down-conversion by the pulse selector and fiber amplification, outputs a repetitive signal light. The rod-shaped crystal amplification unit provides single-pass gain to the signal light. After single-pass amplification, the pulsed light enters the antiresonant hollow fiber for fundamental mode transmission. After transmission, the pulsed light re-enters the rod-shaped crystal amplification unit by changing its polarization, achieving high-efficiency amplification and high beam quality output. This invention effectively solves the problems of beam quality degradation and poor pointing stability of regenerative amplifiers in traditional dual-pass solid-state amplifiers. It features high energy utilization, good beam quality, and strong system stability, making it a simple, efficient, and practical small-signal solid-state amplification solution.

The invention discloses an oscillation mode optical parameter chirped pulse amplification laser and method. The core of the system is to construct a composite resonant cavity, and the cavity partially shares a key optical element, so that the resonant cavity of the slab regenerative amplifier and the resonant cavity of the synchronous pump optical parametric oscillator (OPO) are physically coupled. The specific scheme is as follows: a broadened picosecond chirp seed pulse is injected into a regenerative amplifier for energy amplification; the method is characterized in that the amplified high-energy chirped pulse is directly used as pump light, and the pump light is embedded in a common nonlinear crystal in the composite cavity to excite optical parametric oscillation. Two processes of'chirp pulse regenerative amplification 'and'synchronous pump optical parametric oscillation' are synchronously generated in a composite resonant cavity which is overlapped in time and space, so that energy is circularly extracted from chirp pump light in multiple oscillation processes of OPO signal light, and a unique'oscillation mode OPCPA 'is formed.

A picosecond pulse nonlinear compression device based on a multi-pass cell achieves the advantages of high energy, compactness, and low cost, realizing femtosecond-level pulsed lasers at kilohertz repetition rates. A picosecond pulsed fiber laser generates stable mode-locked picosecond pulses with repetition rates of tens of megahertz. These pulses are injected into a solid-state regenerative amplifier via a fiber coupler, selectively amplifying the output signal to generate millijoule-level picosecond pulses with kilohertz repetition rates. The pulses then enter a mode matching module, which matches the mode of the incident laser with the eigenmode of the MPC cavity. Afterward, the pulses are injected into a spectral broadening module, which is filled with a nonlinear medium liquid to broaden the incident laser spectrum. Finally, the pulses are injected through convex mirrors into a chirp compensation module, which includes multiple pairs of parallel chirped mirrors to compensate for dispersion in the broadened pulsed laser spectrum.