62results about How to "High single pulse energy" patented technology

The invention relates to a high-energy low-repetition-frequency fiber laser, which comprises a pump light source used for providing energy for generating laser light, a gain fiber used for providing gains, a mode locking device used for modulating the laser light so as to generate ultrashort pulses, and a single-mode transmission fiber used for laser transmission, wherein the gain fiber, the single-mode transmission fiber and the mode locking device form a resonant cavity of the fiber laser; the generated laser light is oscillated in the resonant cavity; and under the condition that the lengths of the gain fiber and the mode locking device are not increased, the length of the single-mode transmission fiber is increased according to a relation that the length L of the resonant cavity is inversely proportional to the repetition frequency frep of the fiber laser and according to the reduction of the needed repetition frequency frep. By increasing the length of the resonant cavity, the high-energy low-repetition-frequency fiber laser reduces the repetition frequency of pulses in the resonant cavity, correspondingly improves the energy of a single pulse, further simplifies the structure of an amplification system, improves the efficiency of an amplifier and effectively reduces the cost.

The invention discloses a method and device for measuring the light frequency through a high-power optical fiber optics frequency comb. A mode locking pulse laser serves as an optics frequency comb seed resource to set up the high-power optical fiber optics frequency comb, and a carrier envelope phase signal of the optics frequency comb is locked at the zero frequency; the beat frequency is carried out on the output light of the optics frequency comb and continuous lasers to be tested, the repeated frequencies of the pulse of the optics frequency comb seed resource are finely adjusted through an externally loaded modulation signal, a plurality of sets of beat frequency signals corresponding to different repeated frequencies are obtained, and therefore the accurate measuring of the frequency of the continuous lasers to be tested can be achieved. The method and device have the advantages that the device is stable in structure, the measuring process is easy, and the application is flexible.

The invention discloses a laser strobe active night vision method for remote night monitoring. In the method, a one-frame multi-pulse and multi-door working mode is adopted, in one frame time of exposure of an imaging device, a pulse laser emits a laser pulse sequence, a strobing gate works according to a preset strobing pulse sequence, and the imaging device receives a plurality of target echo signals from a target, therefore, the purpose of light accumulation and signal enhancement is achieved. The invention has good working environmental suitability, and can normally work under the condition of low visibility. Since a long-distance target can be observed at night by using the low-power pulse laser, the cost of the system is greatly reduced, the laser security of the system is improved, and especially the security of eyes is improved.

A conductively cooled high-repetition single frequency Nd: YAG Laser is disclosed. An improved resonance detection method is used to obtain an injection-seeded single frequency pulse laser. A laser resonator is a u-shaped cavity, which uses two high peak power LD to pump a laser crystal from ends. High-precision TEC is used to control the temperature of the laser crystal. With changes of applied voltage on piezoelectric ceramics, seed lights reflected twice from a Brewster angle polarizing sheet interfere with each other. Interference signals received by photodiodes are processed by a sequential control system and when there is a maximum value, Q-witch is opened by the sequential control system. And then a close-to-diffraction-limited single-rate pulse laser is output. According to changes of light extraction time, system can give a negative feedback so that a cavity length can be maintained stably. The invention possesses a high-repetition frequency, high energy, conduction cooling, narrow linewidth, high frequency stability, and a compact structure and can work stably.

The invention relates to an intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection. A resonance detection method is used for obtaining 1064nm single-frequency pulse laser for seed injection is obtained and 532nm single-longitudinal-mode pulse laser is obtained through intracavity frequency doubling. A laser resonant cavity is a U-shaped cavity. Two high-peak-power laser diodes (LD) are used for pumping laser crystals from an end surface, a high-precision thermoelectric cooler is used for controlling the temperature of the laser crystals and green light output is obtained through intracavity lithium triborate (LBO) frequency doubling. The intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection has the characteristics of high efficiency, high energy, conduction cooling, narrow line width, high frequency stability, compact structure and high working stability.

A narrow pulse fiber amplifier belongs to the laser technology field. The fiber amplifier contains the seed source laser, the seed optical coupling system, the gain fiber, the pumped source laser and the pumped coupling system, and the feature is that between the seed source laser and the gain fiber adding the pulse issued by the seed source laser to choose the pulse selector. The selected pulse sequence has the arbitrarily changing repetition frequency, and duration, through the high gain amplification of the fiber amplifier to obtain high-power, narrow pulse width laser pulse output. The invention has the advantages that it makes full use of the narrow pulse width of the seed source laser and the wide gain spectrum and high gain of the fiber amplifier, and adding the pulse selector to make the pulse repetition frequency and duration to be free to change. The invention can obtain narrow pulse width pulse sequence of low repetition frequency, whose single pulse energy and peak power can be significantly improved, but also avoiding the stimulated Brillouin scattering effect.

Disclosed is a laser beam combination system. The laser beam combination system respectively performs total reflection processing on an S-polarization laser and a P-polarization laser through a first total reflection module and a second total reflection module so that incident S-polarization laser and the P-polarization laser can be adjusted to be horizontal and vertical. The S-polarization laser after the total reflection processing is reflected to the second polarization module via the first polarization module and then is reflected again by the second polarization module. The P-polarization laser after the total reflection processing is retracted by the second polarization module to the optical path of the S-polarization laser reflected by the second polarization module so as to finish beam combination of the S-polarization laser and the P-polarization laser. The mean power of a single frequency multiplication laser is reduced as a frequency increases. Therefore, after the S-polarization laser and the P-polarization laser are combined, the frequency is two times that of a single laser, yet the mean power is unchanged, i.e., the single pulse energy at a high frequency is improved, and accordingly, the laser processing speed can be enhanced.

The invention provides a system for realizing 3D printing of a high-molecular material by a picosecond laser. The system comprises a laser system, a control system, an infrared temperature measuring device and a feeding device. Temperature difference with the latest 3D printing job temperature is compensated through calibration, feedback and laser power control. The temperature difference can be accurately controlled within +/- 0.5 DEG C. The high-molecular material can be effectively prevented from warping and nonuniform processing phenomena during 3D printing process.

The invention discloses a high energy hybrid thulium-doped pulse laser single-frequency amplifier which comprises a seed resource, a wavelength division multiplexer, an optical fiber pumping source, a polarization-maintaining single-mode single-cladding thulium-doped optical fiber, an isolator, a beam splitter, an output end, a filter, an acoustic optical modulator, a semiconductor pumping source and a laser crystal. The high energy hybrid thulium-doped pulse laser single-frequency amplifier has the advantages of being simple in structure and stable in system, the optical fiber-solid combined method is used, optical fiber amplification is adopted for a prime stage, the capacity for amplifying small signals is effectively improved, crystal amplification is adopted for a post stage, the advantage that solid lasers are prone to generating low-multi-pulse pulsed light is developed, the nonlinear effect easily occurring in optical fiber amplifying under high power is effectively avoided, low-multi-pulse high-energy pulse output is accordingly achieved, and the good application aspect is achieved.

The invention discloses a double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser. The double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser comprises a pumping device, a laser resonant cavity, a gain optical fiber and a laser output device, wherein the laser is provided with a linear cavity or an annular cavity structure for outputting laser pump, whereinthe pumping device comprises a pumping source, an optical fiber beam combiner and a wavelength division multiplexer; the laser resonant cavity comprises a first reflection type fiber bragg grating, asecond reflection type fiber bragg grating, a semiconductor saturable absorption mirror, a third reflection type fiber bragg grating and a total reflection mirror; the gain optical fiber comprises afirst gain optical fiber and a second gain optical fiber; and the laser output device comprises an optical isolator, an annular device and an optical fiber beam splitter. The mode-locked pulse laser adopts the all-fiber structure, which is simple in design and compact in structure, and capable of effectively improving laser output efficiency and stability and outputting the Q-switched mode-lockingpulse with high single-pulse energy and narrow pulse width.

A white light generation based multi-color femtosecond laser generation device is characterized in that a splitting piece is arranged on a main light path to divide incident light into reflected light and transmission light; the reflected light is focused on a nonlinear crystal after sequentially passing a first attenuation piece, a first lens, a white gem piece, a first concave surface reflecting mirror, a small hole diaphragm, a chirp mirror and a second concave surface reflecting mirror; the transmission light is focused on the nonlinear crystal to be served as pump light after sequentially passing a second attenuation piece, a delay line which is formed by a first reflective mirror and the second reflective mirror, a third reflective mirror, a fourth reflective mirror, a fifth reflective mirror and a second lens. The white light generation based multi-color femtosecond laser generation device has the advantages of being simple in adjustment, compact in structure, stable in light of output signals and the like.

The invention relates to a femtosecond vortex pulse generator, which comprises a vortex beam generation system, a hollow-core fiber system and a pulse compression system, wherein the vortex beam generation system comprises a collimating lens group and a vortex beam generation unit used for transforming a gaussian beam into a vortex beam; the hollow-core fiber system comprises a coupling lens, a cylindrical vacuum chamber and a hollow-core fiber arranged in the vacuum chamber; and the pulse compression system comprises a concave reflector group for carrying out collimating and a pair of chirp mirrors. Only a relatively simple device is used, so that ultra-short and ultra-strong femtosecond vortex laser light can be generated and the femtosecond vortex pulse generator can be applied to the fields of attosecond optics, light filament research and micro-nano machining.

The invention relates to an optical fiber laser based on broad-band spectrum, which comprises a high-reflection coating plated reflection cavity mirror, a pumping source, an optical coupling device and a gain optical part reflection resonant device, wherein the optical fiber laser based on broad-band spectrum forms broadband laser to be output through a pair of broadband reflection resonant cavities, and the broadband laser is used as a seed laser for amplifying an optical fiber. The optical fiber laser based on broad-band spectrum disclosed by the invention has the characteristics of being low in threshold value and easy to pair, and efficiently inhibits nonlinear effect in the optical fiber, so that the single pulse energy and peak power of a pulse optical fiber laser are obviously promoted, and the stability of output power of the optical fiber laser is improved.

The invention discloses a high-energy hundreds of picoseconds laser device based on stimulated Brillouin scattering pulse compression, and belongs to the field of optical instruments, so as to solve the problem that the prior laser can not realize narrow pulse high energy single longitudinal mode output. According to the scheme of the invention, after p polarized light generated by an oscillator passes through a beam expanding telescope, the light transmits a light isolation system, the transmitted p polarized light is amplified and changes into s polarized light via a 90-DEG rotor, the s polarized light is further amplified and then converted into circular polarized light via a 1/4 wave plate, continuous reflection via two plane mirrors is sequentially carried out, a direction is changed, the light then enters a stimulated Brillouin scattering generation unit, and stimulated Brillouin scattering is generated. Generated back Stokes light is returned along the original path, continuous reflection via two plane mirrors is sequentially carried out, a direction is changed, the light is converted into p polarized light via a 1/4 wave plate, the p polarized light is amplified and then converted into s polarized light via a 90-DEG rotor, and the s polarized light is further amplified and separated by a second polarized film and reflected out of the light path.

The invention relates to the technical field of optical fiber laser transmission, and in particular relates to a laser amplification optical fiber for preventing self-convergence damage, which comprises a hollow optical fiber and a gain optical fiber, wherein the rear end of the gain optical fiber is connected with the hollow optical fiber along the laser transmission direction. The gain optical fiber is connected with the hollow optical fiber so as to prevent optical fiber damage caused by optical field convergence due to a self-convergence effect generated during the process of transmitting, amplifying and oscillating the gain optical fiber, so that single fiber power amplification limit performance of the gain optical fiber is improved, and the obtained pulse energy is greatly improved.

The invention relates to a laser treating equipment whose emission wavelength is 593nm, 594nm, or 589nm which is near to ideal the absorption peak 577nm of oxidized hemoglobin, and since it is the full-solid laser treating equipment, compared to dyestuff laser, said treating equipment can significantly reduce the cost. The pulse length of output laser is 3-100ms which is continuously adjustable and each pulse can be divided into two or more 0.2-3ms long-pulse laser. Said long pulse laser treating equipment can replace present dyestuff laser treating equipment to treat the erythema lesion.

The invention relates to an ultra-high-power laser space beam combination system, an ultra-high-power space beam combination laser system, and a group central computer control system. According to theultra-high-power laser space beam combination system, an optical path adjusting module comprises a beam expander, a collimating mirror and a reflector, a plurality of the optical path adjusting modules form an optical path area array, the optical path area array is installed on an angle swinging head, and the angle swinging head is installed on a rotary platform; and a numerical control system controls the rotary platform and the angle swinging head to form linkage with the optical path adjusting modules on the optical path area array, so that laser beams emitted by a plurality of laser devices converge at one point in a space beam combination manner. By integrating the plurality of optical path adjusting modules, and controlling the rotary platform and the angle swinging head to form linkage with the optical path adjusting modules by means of the numerical control system, the technical problem of how to gather energy of all the laser devices to implement intelligent tracking and irradiation on an arbitrary target and enable long-distance output of the laser beams under the command of a computer is solved.

The invention belongs to the technical field of fiber laser, and discloses a saturable absorber with saturable absorption and anti-saturable absorption characteristics, application thereof and a passive Q-switched fiber laser device, and the saturable absorber comprises a 980nm LD pumping source, a 980nm/1550nm wavelength division multiplexer, a 10% output coupler, an erbium-doped gain fiber, a polarization independent isolator, a single-mode fiber, a polarization controller and a Fe3O4-PI composite film, wherein the Fe3O4-PI composite film is cut into a square with the side length of 0.5 mm and then placed on the optical fiber jumper head. According to the passive Q-switched fiber laser, the output characteristics of the passive Q-switched fiber laser are adjusted and optimized through the saturable absorber with saturable absorption and anti-saturable absorption characteristics, the output characteristics of the passive Q-switched fiber laser are greatly optimized, the pulse width and the repetition frequency are compressed, meanwhile, the monopulse energy and the peak power are improved, the output performance of the passive Q-switched fiber laser is improved, and the Q-switched pulse is high in stability.

The invention provides a chirped pulse compression device and a laser. The chirped pulse compression device comprises the following components: a translation roof prism and a grating which are spaced oppositely, wherein all angles are arranged in a total reflection manner; and a reflector assembly which comprises a plurality of reflectors which are all located between the grating and the translation roof prism; wherein after incident light is emitted to the grating, the incident light is diffracted by the grating to form first light which is emitted to the reflector assembly along a first direction, and the first light is reflected back to the reflector assembly after being reflected by the reflector assembly for multiple times and translated by the reference surface position of the translational roof prism, and then is reflected for many times; and the light returns and enters the grating along the direction symmetrical with the first direction relative to the normal direction, and then is subjected to secondary diffraction by the grating to form a second light meeting the grating diffraction condition. The chirped pulse compression device provided by the invention can improve the utilization rate of the grating region and increase the compressible pulse width so as to improve the pulse output single pulse energy and reduce the cost.

The invention discloses a handheld laser cleaning device. According to the handheld laser cleaning device of the invention, a main control board, a laser, a laser power source, a galvanometer drivingboard and an acousto-optic modulator driver are arranged in a shell; a zero-degree total reflection mirror, a pumping source, an acoustic-optical modulator, an output mirror and a first 45-degree total reflection mirror are arranged on the bottom plate of the laser; the pumping source is connected with a cooling-water machine through a water pipe; the laser power source, the galvanometer driving board and the acoustic-optical modulator driver are all in signal connection with the output end of the main control board; the second 45-degree total reflection mirror is arranged behind the first 45-degree total reflection mirror; a coupling head is arranged on the left side of the second 45-degree total reflection mirror; a laser cleaning head is connected with the coupling head through an optical fiber and located outside the shell; a galvanometer is arranged in the laser cleaning head; the galvanometer is in signal connection with the output end of the galvanometer driving board; and the galvanometer driving board is in signal connection with the output end of the main control board. The peak power of the laser emitted by the laser is high.