3778results about "Active medium shape and construction" patented technology

The invention belongs to the technical field of lasers, and discloses a 9-shaped hybrid mode-locked fiber laser, which comprises a pumping source, a 2 * 2 polarization-maintaining fiber coupler, a nonlinear amplification loop mirror loop connected with the first side of the polarization-maintaining fiber coupler, and a chirp fiber Bragg grating connected with the second side of the polarization-maintaining fiber coupler, the polarization maintaining optical fiber coupler is located at the connecting position of the nonlinear amplification annular mirror loop and a linear arm of the laser resonant cavity and used for coupling laser of the nonlinear amplification annular mirror loop to the linear arm, and after being reflected by the chirp fiber bragg grating, the laser is output to the nonlinear amplification annular mirror loop through the chirp fiber bragg grating. And then the laser on the linear arm is split into two beams of light which are transmitted clockwise and anticlockwise in a loop of the nonlinear amplification annular mirror. Two passive mode locking technologies are combined, rapid and stable mode locking can be achieved, the influence of the environment on the operation state is small, the signal-to-noise ratio of output laser pulses can be increased, and ultra-short pulses with narrower pulse width can be achieved.

The invention belongs to the technical field of topological photonic crystals, and discloses a topological laser resonant cavity, a design method thereof and a topological valley photonic crystal laser. According to the invention, three different photonic crystal areas are utilized to form a three-layer heterostructure, and the three different photonic crystal areas are divided into A, B and A'areas according to the same lattice period array arrangement; the area A and the area A'are the innermost layer and the outermost layer of the topological laser resonant cavity respectively, the closed topological laser resonant cavity is formed at the interface of the area A and the area A ', and the area B is embedded in the middle of the interface; the three different photonic crystal regions have different primitive cell energy band characteristics, and the energy band structure of the photonic crystal primitive cell in the region B has a linear dispersion curve and can be described by a Dirac equation; and the photonic crystal primitive cells in the A'and the A region are energy band structures with different topological valley numbers obtained by breaking the symmetry of the photonic crystal primitive cells in the B region. According to the invention, the performance of the topological valley photonic crystal laser can be enhanced.

The invention relates to an all-fiber sub-hundred femtosecond laser based on an SESAM. The all-fiber sub-hundred femtosecond laser comprises the SESAM, a wavelength division multiplexer, a pumping source, a pumping protector, a gain fiber, a chirp fiber bragg grating, an isolator, a reflector, a compression unit and an autocorrelator. According to the invention, the chirp fiber bragg grating with the dispersion amount of 0.115 ps / nm is adopted to compensate positive dispersion in the cavity, so that mode-locked pulse with the spectral width of 23nm is realized. A transmission-type diffraction grating pair is adopted, the pulse width is compressed to 88fs, and the maximum spectral width 27nm is obtained under the dispersion of 0.00087 ps2 in a near-zero cavity. The condition that the optimal spectral bandwidth of the optimal seed source pulse based on the optical fiber chirped pulse amplification laser should be larger than 15 nm is met, and the compression pulse distortion of the amplifier is reduced. By adopting the linear cavity, the SESAM is adhered to the surface of the single-mode optical fiber patch cord for starting mode locking, so that an all-optical-fiber structure of the system is realized, and the single-mode optical fiber patch cord is suitable for industrial integrated application.

The invention provides a high-power multimode fiber laser amplifier based on wavefront shaping. The high-power multimode fiber laser amplifier comprises a seed light wavefront control unit, a multimode gain fiber amplification unit and an output light spot detection and feedback unit, the seed light wavefront control unit is used for carrying out wavefront modulation on the seed light output by the polarization seed laser by using a spatial light modulator loaded with a phase diagram; the multimode gain optical fiber amplification unit is used for performing power amplification on the seed light which is output by the seed light wavefront control system and is subjected to output wavefront modulation; and the output light spot detection and feedback unit is used for outputting the laser of most power of the multimode gain fiber amplification system, collecting the rest laser of a small part of power for far-field light spot information detection, calculating the corresponding far-field barrel medium power based on the detected far-field light spot information, and outputting the far-field barrel medium power. And the power in the far-field barrel is used as an evaluation function to operate an optimization algorithm to generate an optimal phase diagram, and the optimal phase diagram is loaded on the spatial light modulator to realize closed-loop feedback control.

A passive mode-locked polarized laser including an oscillator, the oscillator including: a cavity; a pump source coupled to the cavity; an optical output coupler, and an optical output isolator. Also, a method for generating polarized pulsed light having a wavelength of about 2 μm using the passive mode-locked polarized laser.

The invention provides a high-concentration ytterbium-doped double-clad silicate optical fiber single-frequency amplifier which comprises a single-frequency laser seed source, a double-clad optical fiber pre-amplifier and a high-concentration ytterbium-doped double-clad silicate optical fiber main amplifier which are connected in sequence. The single-mode optical fiber pre-amplifier is used for primarily amplifying the single-frequency laser; the double-clad optical fiber pre-amplifier is used for further amplifying the optical signal output from the single-mode pre-amplifier; and the high-concentration ytterbium-doped double-clad silicate optical fiber main amplifier is used for performing high-power amplification on the signal light amplified by the double-clad optical fiber pre-amplifier and outputting specific high-power narrow-linewidth single-frequency laser. Single-frequency laser seed source low-noise coefficient pre-amplification is achieved through a front multi-stage pre-amplification system, a high-concentration ytterbium-doped double-clad silicate optical fiber is adopted in a final main amplifier, the length of a needed active optical fiber is shortened through provided high gain, the stimulated Brillouin scattering effect is restrained, and the optical fiber is high in gain and high in power consumption. And the output power of the single-frequency narrow-linewidth optical fiber amplifier is improved.

The invention discloses a 2 [mu] m nanosecond pulse fiber laser and a time domain waveform adjustment method thereof. The laser comprises a seed source module and an amplification module connected with the seed source module. The seed source module comprises a first high-reflectivity fiber bragg grating, an acoustic optical modulator, a first beam combiner, a first thulium-doped fiber, a 2 * 2 coupler and a second high-reflectivity fiber bragg grating which are connected in sequence, as well as a driving source connected with the acoustic optical modulator and a first pumping source connected with the first beam combiner; the amplification module comprises an online isolator, a second beam combiner, a second thulium-doped optical fiber and an output jumper which are connected in sequence, and a second pumping source connected with the second beam combiner; the rising edge time and the starting time of the acousto-optic modulator are subjected to parameter setting through a human-computer interface of the driving source; the wavelengths of lasers output by the first pumping source and the second pumping source are both 793 nanometers. According to the invention, the multi-peak phenomenon of the Q-switched pulse laser of the 2um waveband can be conveniently and effectively eliminated, the performance of the laser is improved, and the application requirements of low cost and mass production are met.

The invention discloses an optical frequency comb repetition frequency locking device and method based on automatic power control, and relates to the technical field of optical frequency combs, the device comprises an optical frequency comb optical system, an optical fiber length automatic control system and an automatic power control system, the optical frequency comb optical system is used for generating optical frequency comb repetition frequency, the optical fiber length automatic control system locks the optical frequency comb repetition frequency output by the optical frequency comb optical system, and the automatic power control system is used for adaptively adjusting the signal power in a corresponding link when the optical frequency comb optical power or the reference source power changes. The input power of the mixer local oscillator and the radio frequency port is maintained at the preset power; according to the technical scheme of the invention, the stability and accuracy of the input power of the radio frequency and local oscillation port of the mixer are improved, the suppression of noise in a link is enhanced, a phase-locked loop of an optical fiber length automatic control system can be maintained in an optimal working state for a long time, and the practicability of an optical frequency comb product is improved.

The invention provides a quasi-continuous thulium-doped fiber laser capable of synchronously suppressing relaxation oscillation and self-pulse, relates to the technical field of fiber laser, and is used for simultaneously realizing suppression of a self-pulse effect and a relaxation oscillation peak. Comprising a continuous driving module, a pulse driving module, a semiconductor laser pumping source, a high-reflectivity fiber bragg grating, a low-reflectivity fiber bragg grating, a beam combiner, a thulium-doped gain fiber, a passive fiber, a cladding pumping stripper and a laser output port, the continuous pump light and the pulse pump light are respectively driven by the continuous driving module and the pulse driving module to output continuous pump light and pulse pump light; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating form a resonant cavity structure, the thulium-doped gain fiber serves as a gain medium of the thulium-doped fiber laser and absorbs pump light to generate population inversion, laser oscillation is formed by combining the resonant cavity of the laser, relaxation oscillation suppression is achieved, and meanwhile longitudinal mode distribution of the laser is effectively disrupted.

Disclosed herein are methods, devices, apparatuses, and non-transitory computer readable media for signal communication via hollow fiber using stimulated Raman scattering (HC-SRS). Such use of HC-SRS can cause amplification of the signal as it is transmitted through the hollow fiber. Such use of HC-SRS may have (A) reduced signal loss during transmission, (B) reduced latency time as compared to optical signal propagating through a solid core optical fiber, (C) increase a distance between repeaters required for signal transmission, or (D) any combination of (A) (B) and (C); with any of (A) and (C) being compared to any of the currently used signal transmission methodologies disclosed herein.

The invention discloses a high-power intermediate infrared fiber laser. The fiber laser is composed of a first pumping source, a second pumping source, a pumping beam combiner, a high-reflectivity fiber grating, a low erbium-doped fluoride fiber, a low-reflectivity fiber grating, a cladding light filter, a fiber end cap, a collimating lens and a dichroscope. The mode of combining erbium ion ground state transition achieved through fiber core pumping and erbium ion excited state transition achieved through cladding pumping is adopted, mid-infrared laser upper energy level particle number accumulation is obtained, and meanwhile laser lower energy level particles are effectively consumed through the cladding pumping transition process. And the population inversion state of the laser system is kept, and the particle circulation rate and the quantum efficiency from the pump light to the intermediate infrared laser are improved, so that the generation of high-power and high-efficiency intermediate infrared fiber laser is realized.

The invention provides a miniaturized spatial macro-energy ultraviolet single-frequency laser. The miniaturized spatial macro-energy ultraviolet single-frequency laser comprises a single-frequency pulse seed laser module, a three-stage amplifier and a nonlinear transformation module, the single-frequency pulse seed laser is a passively Q-switched single non-planar annular cavity and can output single-frequency 1064nm pulse laser of ten microfocus magnitude. The three-stage amplifier adopts a compact side pumping batten crystal structure, so that 1064nm single-frequency laser output with energy of 350mJ can be realized; by improving the output energy of the first amplifier, high-gain amplification of small-signal incident laser pulses is realized, and the pressure of subsequent amplification is reduced; the nonlinear transformation module can realize long-life and high-reliability ultraviolet single-frequency pulse output of hundred millijoule and hundred hertz by controlling the power density; the method can be used for satellite-borne hyperspectral laser radars, satellite-borne wind measurement laser radars and the like to obtain global meteorological information. The invention mainly solves the problems of miniaturization, high frequency stability and high reliability of the large-energy space ultraviolet single-frequency laser.

A bismuth-doped (BI) fiber (BIDF) and a bismuth-doped fiber amplifier (BIDFA) are shown and described. The BiDF includes a gain band and an auxiliary band. The gain band has a first center wavelength (λ1) and a first six decibel (6 dB) gain bandwidth. The auxiliary band has a second center wavelength (λ2), λ2<λ1. The system also includes a signal source and a pump source optically coupled to the BiDF. The signal source provides an optical signal at λ1, and the pump source provides pump light at a pump wavelength (λ3).

The present application relates to the field of optical fiber technology, and in particular to a rare earth-doped antiresonant hollow core optical fiber. The rare earth-doped antiresonant hollow core optical fiber comprises a cladding and a plurality of antiresonant tubes, wherein the cladding comprises a first refraction tube and a rare earth-doped tube sleeved on the first refraction tube; each antiresonant tube is sequentially arranged on the inner wall of the first refraction tube at intervals, and each antiresonant tube together forms a core region, which is used to transmit laser; the rare earth-doped tube is used to amplify the laser, and the first refraction tube is used to couple the amplified laser into the core region. The rare earth-doped antiresonant hollow core optical fiber provided by the present application can achieve laser gain and reduce the possibility of mode instability during laser transmission.

The utility model provides a low-reflection light-splitting monitoring fiber laser which comprises a fiber amplifier, a light-splitting isolation assembly, an output head and a photoelectric detector. The light splitting isolation assembly comprises a double-fiber collimator, a two-stage isolator and a single-fiber collimator which are sequentially arranged in the direction of a main light path, the double-fiber collimator comprises a first optical fiber, a second optical fiber, a first capillary tube and a first lens, and the fiber core end of the first optical fiber and the output end face of the first capillary tube form a first beam expanding length; the fiber core end of the second optical fiber and the input end face of the second capillary tube form a second beam expanding length, the input end of the first optical fiber is connected with the optical fiber amplifier, the output end face of the first lens faces the input end of the two-stage isolator, the output end face of the first lens is plated with an anti-reflection film, and the output end of the second optical fiber is connected with the photoelectric detector. According to the scheme, the optical path is more concise, a device optical fiber coupler is saved, more space is reserved, and the integration level of the laser module is higher.

The embodiment of the invention discloses a laser and related equipment and method. The laser comprises a laser generation module, a first coupler and a reflective space structure composed of at least one reflective element, multiple paths of laser generated by the laser generation module form optical pulses in the first coupler through interference, the optical pulses are divided into two paths, one path of first optical pulse is transmitted to the reflective element, and the other path of first optical pulse is transmitted to the second coupler. And the other path of second optical pulse is output. The first light pulse is reflected back to the laser generating module by the reflecting element. The optical path of the optical pulse transmitted in the space can be changed by controlling the reflection element to move, so that the repetition frequency of the optical pulse generated by the laser generation module can be adjusted. It is understood that the back-and-forth optical path of the optical pulse in the space can be adjusted by controlling the reflection element to move, equivalently, the optical path of the optical pulse in the space is changed exponentially, and the repetition frequency of the optical pulse can be adjusted in a larger range, for example, large-range frequency modulation over 2 MHz can be achieved.

This pulsed light generation device comprises: an oscillation unit that oscillates pulsed light; an amplification unit that enlarges the bandwidth of the pulsed light oscillated by the oscillation unit; and a modulation unit that modulates, using soliton self-frequency shift, the wavelength of the pulsed light obtained by enlarging of the bandwidth of the spectrum by the amplification unit.

The invention discloses a narrow pulse generation system and method of an FPGA integrated fiber laser, and belongs to the field of all-digital fiber laser control. The narrow pulse generation system comprises a multi-phase clock generation module, a dynamic delay chain module, a pulse width search module, a signal selection module, a logic operation module, a frequency control module, a self-calibration module and an LVDS driving module which are in synergistic effect. The multi-phase clock generation module is used for realizing rough delay adjustment of nanosecond stepping; the dynamic delay chain module is used for realizing fine delay adjustment of picosecond stepping; therefore, based on the FPGA integrated design, an external delay chip and a high-frequency peripheral circuit are not needed, the hardware complexity and cost are reduced, and the anti-interference capability is high; picosecond-level stepping pulse width adjustment is realized through a two-level structure of nanosecond-level coarse adjustment and picosecond-level fine adjustment, and the limitation of a traditional FPGA (Field Programmable Gate Array) integration scheme is broken through; time delay deviation caused by environment change and hardware drift is considered, temperature compensation and TDC calibration are carried out, and the stability of pulse width is ensured.

The invention relates to the technical field of optical fibers, in particular to a rare-earth-doped anti-resonance hollow-core optical fiber. The rare-earth-doped anti-resonance hollow-core optical fiber comprises a cladding and a plurality of anti-resonance tubes, and the cladding comprises a first refraction tube and a rare-earth-doped tube arranged on the first refraction tube in a sleeving mode; the anti-resonance tubes are sequentially arranged on the inner wall of the first refraction tube at intervals, a fiber core area is defined by the anti-resonance tubes jointly, and the fiber core area is used for transmitting laser; the rare earth doped tube is used for amplifying laser, and the first refraction tube is used for coupling the amplified laser into the fiber core area. According to the rare earth-doped anti-resonance hollow-core optical fiber provided by the invention, laser gain can be realized, and the possibility of mode instability in a laser transmission process is reduced.

The invention relates to a self-adaptive wide-temperature-interval air-cooled fiber laser and a control method, the self-adaptive wide-temperature-interval air-cooled fiber laser comprises a shell, a first pumping module, a second pumping module, a control module, a first current driving module and a second current driving module are arranged in the shell, the first current driving module is connected with the first pumping module, and the second current driving module is connected with the second pumping module. The first current driving module is connected with the first pumping module, the second current driving module is connected with the second pumping module, a laser gain cavity is formed in the side face of the shell, a first fan and a second fan are arranged on one side of the shell, a first air cooling heat dissipation plate and a second air cooling heat dissipation plate are arranged on the other side of the shell, and the laser gain cavity is connected with the first pumping module and the second pumping module. The first fan, the second fan, the first pumping module, the second pumping module, the first current driving module and the second current driving module are all connected with the control module, and the laser gain cavity is connected with an optical fiber cladding light filter. By controlling the temperature environment, the pump light conversion rate is increased.

The invention relates to the technical field of light transmission, in particular to a high-return-light-resistant laser and a manufacturing method thereof.The high-return-light-resistant laser is characterized in that a red light unit and a laser unit are coupled through a red light optical fiber and a main optical fiber, the red light optical fiber is an optical fiber with the gradually-changed refractive index, and the main optical fiber is an optical fiber with the gradually-changed refractive index; the red light signal can be transmitted to the main optical fiber through the design of gradually changing the refractive index, and is transmitted in the forward direction along the laser unit; the refractive index of the red light optical fiber is set to be smaller than the refractive index of the main optical fiber, due to the fact that the refractive indexes of the red light optical fiber and the main optical fiber are different, the return light can be totally reflected at the coupling position of the main optical fiber and the red light optical fiber, and therefore the return light is effectively limited in the main optical fiber, and the return light is reversely transmitted along the main optical fiber. And the risk that the red light diode in the red light unit is damaged by the return light is reduced.

A high-brightness and high-power fiber laser adopts an oscillator structure and comprises a pumping module, a high-reflectivity fiber grating, a gain fiber, a low-reflectivity fiber grating and a cladding light filter, the gain fiber is a rare earth ion doped ZBLAN fiber which takes ZBLAN as a matrix material and is of an all-solid-state anti-resonance structure, and the low-reflectivity fiber grating is a rare earth ion doped ZBLAN fiber which is of an all-solid-state anti-resonance structure. The gain optical fiber comprises a fiber core area, a cladding area, an anti-resonance area and a coating layer, the anti-resonance area is composed of at least one capillary tube set, each capillary tube set comprises a plurality of capillary tubes, the capillary tubes in each capillary tube set are annularly arranged on the periphery of the fiber core area with the fiber core area as the center, and the cladding layer is arranged on the cladding layer. The matrix material in each capillary tube and the matrix material in the cladding region are the same and are ZBLAN, and the matrix material ZBLAN in the fiber core region is doped with dysprosium ions. According to the invention, the rare earth doped all-solid-state anti-resonance optical fiber is adopted as the gain optical fiber, so that high-brightness, high-power and high-efficiency output can be realized.

A 2-micron large-energy solid two-way amplifier based on a single-frequency pulse optical fiber preceding stage can make full use of the small signal amplification capacity of optical fiber laser and the energy extraction capacity of solid laser, and meanwhile the problem that energy is difficult to improve due to the stimulated Brillouin scattering effect in an optical fiber is solved. And high-stability, high-repetition-frequency and large-energy single-frequency pulse laser output can be realized. The all-fiber cascade amplifier comprises an all-fiber cascade amplifier and a solid two-way amplifier, according to the all-fiber cascade amplifier, a continuous narrow-linewidth fiber laser is adopted as a seed source, continuous light is modulated into pulse light through an acousto-optic modulator, and the waveform, the pulse width and the repetition frequency of output pulse laser are adjusted; the modulated pulse light adopts a main oscillation power amplification structure and is preliminarily amplified by a polarization maintaining optical fiber amplifier; the solid-state amplifier adopts a two-way amplification structure, and further high-efficiency amplification is realized through solid-state two-way amplification. The whole laser system is compact in structure, stable, adjustable in parameter and capable of meeting application requirements of different scenes.

The embodiment of the invention discloses an optical fiber laser and a green laser device. The fiber laser comprises a seed source and at least one stage of fiber amplifier. The seed source comprises a first pumping source, a first pumping beam combiner, a first fiber bragg grating, a first ytterbium-doped fiber, a second fiber bragg grating and a second ytterbium-doped fiber; the optical fiber amplifier comprises a second pumping source, a second pumping beam combiner and a third ytterbium-doped optical fiber; the second pumping source comprises a third pumping source, a third pumping beam combiner, a third fiber bragg grating, a fourth ytterbium-doped fiber and a fourth fiber bragg grating. The optical fiber laser provided by the embodiment of the invention adopts a cascade pumping technology, so that the power and brightness of fundamental frequency laser output by the narrow linewidth optical fiber laser are effectively improved, the nonlinear effect of the fundamental frequency laser and the thermal load of the optical fiber are remarkably reduced, and the beam quality and output power of the fundamental frequency laser are remarkably improved; and a foundation is laid for higher green light output.

The embodiment of the invention discloses a light amplification device and a related system and method. The light amplification device comprises an optical fiber isolator, a pump light source, a beam combiner and an EYDF. A large amount of pump light in the EYDF cannot be completely absorbed by ytterbium ions, and ytterbium-band ASE light generated by the ytterbium ions can be further amplified by the pump light, so that effective amplification of signal light by the pump light is limited by the ytterbium-band ASE light. According to the embodiment of the invention, the optical fiber isolator in the light amplification device is modified, the optical fiber isolator can reflect the ytterbium-band ASE light as an auxiliary signal back to the EYDF, the excited amplification of the auxiliary signal and the absorption of the auxiliary signal by the EYDF can effectively inhibit the EYDF from generating the ytterbium-band ASE light, the self-oscillation and self-pulsation of the ytterbium-band ASE light are avoided, and the reliability of the light amplification device is improved. Therefore, the pumping conversion efficiency and the stability of the output power are improved. Meanwhile, the optical amplification device provided by the embodiment of the invention can effectively inhibit the EYDF from generating the ytterbium-band ASE light without adding an additional device, and is beneficial to reducing the cost and the power consumption.

The invention relates to the technical field of laser control, in particular to an intelligent control method and system of an MOPA laser. The method comprises the following steps: constructing a target training data set and a one-dimensional convolutional neural network model; training a one-dimensional convolutional neural network model based on the target training data set in combination with a target loss function and a back propagation algorithm to obtain a target model; acquiring current operation parameters of the MOPA laser; inputting the current operation parameters into a target model, and outputting target regulation and control parameters by the target model; the target regulation and control parameters comprise the working current of a pumping module in the MOPA laser and the working temperature of a doped fiber; based on the target regulation and control parameters, the working current of a pumping module in the MOPA laser and the working temperature of a doped optical fiber are adjusted, the working temperature of the doped optical fiber comprises a plurality of different target temperatures, and each target temperature corresponds to a different position on the doped optical fiber. In this way, the problems caused by the nonlinear effect generated under high-power pumping can be reduced.

The invention provides a dual-wavelength tunable all-solid-state mid-far infrared laser, relates to the technical field of lasers, and is used for solving the technical problems that high-performance dual-wavelength 3 [mu] m waveband laser and mid-far infrared waveband laser generated by pumping of the high-performance dual-wavelength 3 [mu] m waveband laser are difficult to obtain in the prior art. The middle and far infrared laser comprises an erbium-doped laser and an optical parametric oscillator, the erbium-doped laser is used for providing dual-wavelength 3-micron wave band pulse laser, and the erbium-doped laser comprises a pumping source, an erbium-doped laser medium, a gain modulator, a high reflective mirror and an output mirror; the optical parametric oscillator is used for obtaining medium-wave infrared laser and long-wave infrared laser which are output in a dual-wavelength mode under the pumping effect of the dual-wavelength pulse laser in the 3-micron wave band. The mid-far infrared laser is simple in structure and convenient to use, can obtain tunable dual-wavelength mid-far infrared pulse laser with high beam quality, and meets the light source requirements of differential absorption of toxic gas telemetering of laser radar and photoelectric countermeasure.

A laser apparatus includes: a laser oscillator that includes a mirror and emits a laser beam; and an external resonator that includes a nonlinear optical crystal that functions as a phase conjugate mirror. The phase conjugate mirror reflects the laser beam and produces a phase conjugate wave that reaches the mirror of the laser oscillator, and the mirror of the laser oscillator and the phase conjugate mirror cause laser oscillation such that a wavelength and a phase of the laser beam oscillated by the laser oscillation are automatically fixed.

An electrodeless laser-driven light source includes a laser that generates a CW sustaining light. A pump laser generates pump light. A Q-switched laser crystal receives the pump light generated by the pump laser and generates pulsed laser light at an output in response to the generated pump light. A first optical element projects the pulsed laser light along a first axis to a breakdown region in a gas-filled bulb comprising an ionizing gas. A second optical element projects the CW sustaining light along a second axis to a CW plasma region in the gas-filled bulb comprising the ionizing gas. A detector detects plasma light generated by a CW plasma and generates a detection signal at an output. A controller generates control signals that control the pump light to the Q-switched laser crystal so as to extinguish the pulsed laser light within a time delay after the detection signal exceeds a threshold level.

The invention relates to the technical field of laser control, and discloses a 920nm femtosecond pulse fiber laser system based on a neodymium-doped fiber. The system comprises a seed laser source system, a pre-chirp system, an amplification system and a compression system, the output end of the seed laser source system is connected with the input end of the pre-chirp system, the output end of the pre-chirp system is connected with the input end of the amplification system, and the output end of the amplification system is connected with the input end of the compression system. Through a pre-chirp management method, the seed pulse can simultaneously realize the improvement of the pulse energy and the violent broadening of the spectrum in the amplification process. And a wider spectrum can obtain a narrower pulse width after being subjected to time domain compression. The narrower the width of the pulse means that the energy is more concentrated, so that the peak power of the laser pulse output after compression is higher, and the problem that narrow pulse width and high energy output cannot be simultaneously realized in the 920nm wave band in the existing fiber laser technology is solved.