23results about How to "High beam quality" patented technology

The application discloses a kind of parallel coupling self-imaging external cavity coherent array semiconductor laser, comprising: semiconductor laser chip array, light transmission dielectric layer and external cavity reflection layer;Semiconductor laser chip array includes multiple light emitting units, light transmission dielectric layer and external cavity reflection layer form laser self-imaging external cavity;The non-light emitting area of semiconductor laser chip array light emitting surface is coated with high reflection film, and the feedback light that cannot be injected into the light emitting unit due to incomplete self-imaging at the edge of semiconductor laser chip array can oscillate in self-imaging external cavity multiple times to reform the self-imaging that can be completely injected into the light emitting unit.The application improves the injection of laser outside the light emitting area, can efficiently parallel coupling all light emitting units including edge in chip array, eliminate the edge effect of chip array generated by self-imaging external cavity feedback, enhance the feedback efficiency of self-imaging external cavity, obtain the coherent array laser output of high parallel coupling efficiency, high efficiency optical mutual injection.

The invention relates to a radiation meter dense feed source array directional diagram optimization method based on a generative adversarial network. The method comprises the following steps: constructing a training data set, a condition vector containing a target directional diagram performance index and a corresponding optimal amplitude-phase weight vector; designing a conditional generative adversarial network model; constructing a physical constraint loss function by embedding a differentiable electromagnetic calculation module; loading the constructed training data set, and training a complete generative adversarial network model based on a loss function embedded with a differentiable electromagnetic calculation module; and when the system antenna pattern obtained according to the amplitude-phase adjustment parameters output by the generative adversarial network model meets the antenna pattern evaluation index, completing dense feed source array antenna pattern optimization. According to the method, the target weight is dynamically adjusted and optimized on orbit, so that a single model can adapt to beam forming requirements in different observation scenes, and flexible switching of multiple task modes such as high-resolution detection and wide-range general survey is realized.

The invention discloses a laser output optical device, a laser, equipment and a method. The laser output optical device comprises an output optical fiber, an optical waveguide and an optical output head which are connected in sequence, the output optical fiber is used for outputting point ring light beams, a cladding layer, wrapping the second fiber core, of at least partial area, close to the output optical fiber, of the optical waveguide comprises a second conical structure, and the cross section of the second conical structure is annular. The outer diameter of the second conical structure is gradually increased in the light beam transmission direction, and the second conical structure is used for adjusting the light path of the point ring light beam so as to adjust the divergence angle of inner and outer ring light beams. And the optical output head is used for outputting the light beam adjusted by the optical waveguide. The pre-modulated light from the output optical fiber is accurately regulated and controlled, the divergence angle of the output light is adjusted, the light beam quality is improved, and meanwhile the device has the advantages of being simple in structure, low in cost and high in stability.

The invention discloses a slice laser based on a topological structure dodging layer. The slice laser comprises a pumping system, a pumping light injection module and a composite dodging waveguide structure, pumping light generated by the pumping system enters the composite dodging waveguide structure through the pumping light injection module; the front end face of the composite dodging waveguide structure is plated with a pumping light wavelength high-reflective film and a laser wavelength antireflection film, and the rear end face of the composite dodging waveguide structure is plated with a pumping source wavelength and laser wavelength high-reflective film; the composite dodging waveguide structure comprises a slice gain medium, a topological structure dodging layer and a middle refractive index layer which are sequentially arranged from the front end face to the rear end face. The topological structure dodging layer is composed of a low-refractive-index material layer and a high-refractive-index material topological graph arranged on the low-refractive-index material layer; and the pump light injection module is fixed above the high refractive index material of the middle refractive index layer or the topological structure dodging layer. Pumping uniformity is improved fundamentally, high-order mode suppression and efficient fundamental mode extraction are facilitated, and output power and light beam quality are improved at the same time.

The application relates to a kind of laser beam shaping systems and methods based on optical waveguide, belong to beam shaping technology.It includes semiconductor laser from left to right sequentially arranged, fast axis collimating lens, slow axis collimating lens, beam expander system, focusing lens and optical waveguide;Fast axis collimating lens is plano-convex cylindrical lens, for collimating the fast axis direction of light beam;Slow axis collimating lens is plano-convex cylindrical lens, for collimating the slow axis direction of light beam;Beam expander system includes preceding plano-concave cylindrical lens and following plano-convex cylindrical lens, for expanding the light beam width of slow axis direction to be consistent with the light beam width of fast axis direction;Focusing lens is plano-convex lens, for focusing light beam to optical waveguide input end;The input end section of optical waveguide is rectangle, and the output end section is circular, for shaping rectangular light spot into circular light spot.In the application, light beam is transmitted in optical waveguide efficiently, and gradually shaped into circular light beam through transition structure.

The application provides an internal-pumping thin slice laser emitting coherent array laser, comprising a heat sink, a pump light source, a coupling module, an internal resonant cavity and a cut-angle external cavity, the internal resonant cavity, the cut-angle external cavity and a double-wavelength reflecting layer arranged outside a front end surface of the cut-angle external cavity form a resonant cavity, the internal resonant cavity comprises, from inside the cut-angle external cavity, a semi-reflective semi-transmissive layer, a micro-structure thin slice and a double-wavelength high-reflective layer arranged in sequence from the inside of the front end surface to a rear end surface, and the double-wavelength high-reflective layer and the rear end surface of the cut-angle external cavity are attached to the heat sink. The internal-pumping thin slice laser emitting coherent array laser has the advantages of high pumping efficiency, output power, beam quality and stability, and compact structure. The application further provides a preparation method of the internal-pumping thin slice laser emitting coherent array laser.

This invention discloses a device for real-time analysis of multidimensional information of spatiotemporally mode-locked pulses using an all-fiber structure, belonging to the field of ultrafast optics technology. It includes an all-fiber spatiotemporally mode-locked laser platform, a raw pulse beam profile measurement module, an optical circulator, a sub-pulse beam profile measurement module, and a dispersive Fourier transform and real-time spectral information detection module. Based on the generalized multimode nonlinear Schrödinger equation, this invention constructs a theoretical model of the spatiotemporally mode-locked laser, explores the multidimensional parameter coupling mechanism during spatiotemporal mode-locking, clarifies the mapping relationship between modes and frequencies, and provides a theoretical basis and method for high-precision mode differentiation and multidimensional real-time information extraction. This invention aims to rationally design the parameters of each fiber grating according to the spectral width and temporal interval of the spatiotemporally mode-locked pulse, reflecting more sub-pulses while ensuring that the pulse temporal domains do not overlap, achieving high-precision spatial mode resolution, and maximizing pulse broadening to obtain high-resolution real-time spectral information.

This invention discloses an all-solid-state white laser, belonging to the field of laser technology. The laser includes a pump source for generating pump light and a composite laser gain medium for receiving the pump light. The composite laser gain medium is composed of several laser crystals with a stepped distribution of pump light absorption coefficients and several nonlinear optical crystals arranged in a cross-bonded configuration. A first laser resonator, a second laser resonator, and a third laser resonator are formed by coating the laser crystals and nonlinear optical crystals respectively, enabling them to generate lasers of different wavelengths in the same direction under the action of focused pump light. The first laser output from the first laser resonator, the second laser output from the second laser resonator, and the third laser output from the third laser resonator are mixed in the same direction to generate white light, which is then output. This invention effectively improves the thermal effect inside the gain medium through relatively independent resonators, which is beneficial for obtaining high-quality, high-power white light output.

This application relates to the field of laser technology and provides a side-pumped pumping device, its fabrication method, and a chip. The fabrication method includes: providing a substrate; fabricating a metasurface structure on at least one surface of the substrate to obtain a metasurface substrate; stripping the outer cladding of a target region in an optical fiber to expose the inner cladding; ensuring that the length of the target region along the optical fiber axis is greater than or equal to the length of the metasurface substrate; placing the metasurface substrate within the inner cladding of the target region; and placing a laser diode bar in the optical fiber, with the laser diode bar opposite to the metasurface structure, to obtain the pumping device. This fabrication method is simple, and the resulting pumping device has a compact structure, few components, low complexity, and practicality. It exhibits high and stable coupling efficiency, high beam quality, and high alignment accuracy, effectively ensuring performance. Furthermore, it eliminates the need for an additional optical system, special fiber combiners, and multimode pump fibers, effectively reducing fabrication costs.

This invention relates to a multi-pass optical path system and its adjustment method for an off-axis dual-reflector disk laser, overcoming a series of problems associated with existing multi-pump schemes for disk lasers, such as high processing requirements, difficult system assembly and adjustment, and complex structure and difficult optical adjustment of the signal light amplification system. This invention employs a combination of a series of small-aperture spherical or aspherical mirrors and total reflection mirrors, utilizing a discrete adjustment method to uniformly distribute the pump spot across different mirror surfaces, achieving multi-pass pumping of the pump light and improving the beam quality of the output laser. Simultaneously, a focusless system structure is used to achieve multi-pass amplification of the signal light, improving the operability of optical adjustment. Furthermore, the system can achieve a common optical path for pumping and amplification, facilitating high-efficiency absorption of the pump light and optimal signal light gain amplification; it also allows for adjustment of the number of multi-passes, resulting in high system flexibility, low processing and debugging difficulty, convenient equipment maintenance, and ease of industrial application.

The invention provides a disc-type regenerative laser cavity for a laser amplifier, a disc-type laser and a laser amplification method. According to the disc-type regeneration laser cavity for the laser amplifier, the disc-type laser and the laser amplification method, laser oscillation is formed on the same disc-type crystal at the same time through two beams of laser with different spatial orientations of the main resonant cavity and the auxiliary resonant cavity, redundant pump light energy of the main cavity can be extracted by adjusting optical parameters of the auxiliary cavity, and the laser amplification efficiency is improved. The thermal pressure of the disc is reduced, and laser pulse energy of the main cavity is shaken and stripped to the auxiliary cavity, so that the laser pulse power output by the main cavity is more stable, the light beam quality is better, and the light beam directivity is more stable.

The application belongs to the technical field of laser. A kind of dual-wavelength asynchronous common cavity amplification and frequency 589nm laser and method are provided, 1064nm and 1319nm single frequency continuous seed source are chopped after corresponding acoustooptic modulator, respectively pass through lens shaping, by first coupling mirror, couple into solid amplification module, two pulse light frequency are all, time sequence difference, all are located near the falling edge of pump source. After amplification, light is separated by first beamsplitter, 1064nm light passes through corresponding mirror, second 1064nm lens, 1319nm light passes through second 1319nm lens, then by second coupling mirror, couple into frequency conversion crystal, and output 589nm laser by second beamsplitter, the application simplifies structure, improves frequency conversion efficiency and beam quality.

The invention discloses a medium-long wave infrared optical fiber beam combiner with high beam quality and a preparation method of the medium-long wave infrared optical fiber beam combiner. The beam combiner is composed of a few-mode input optical fiber bundle formed by fused biconical taper and a multi-mode output optical fiber welded with the few-mode input optical fiber bundle, and the core of the beam combiner is that through collaborative design of a mode field and biconical taper geometry of the few-mode optical fiber, adiabatic mode conversion from a few mode to a fundamental mode in a taper area is achieved, and multiple paths of input laser are efficiently coupled into the fundamental mode of the output optical fiber. The preparation method sequentially comprises the steps of optical fiber preparation, tapering parameter theoretical calculation and simulation optimization, input optical fiber preprocessing and bundling, controllable tapering and welding, and packaging post-processing. The beam combiner can realize high-efficiency power synthesis and multi-wavelength spectrum synthesis of multi-path medium-wave / long-wave infrared laser, maintains excellent beam quality while remarkably improving the total output power, and is suitable for a high-brightness wide-spectrum infrared laser system.

The invention discloses a photon mutual injection distributed expandable VCSEL (Vertical Cavity Surface Emitting Laser) phase-locked array, which is characterized in that efficient electrical isolation between adjacent VCSEL units is realized through a multi-time ion injection process, and the array is divided into a plurality of independent controllable sub-arrays by utilizing addressable electrodes. Photon mutual injection is directly carried out between the VCSEL units through the interior of the resonant cavity to realize phase locking, and dependence on a complex external phase locking system is not needed, so that high-beam-quality laser output is realized, the system complexity and integration difficulty are remarkably reduced, and miniaturization is facilitated. The array is compact in structure, the phase locking mode is flexible and controllable, and the array is suitable for the high-tech fields of optical interconnection, laser radar, free space communication, optical calculation and the like.

The application discloses a side-pumped passive Q-switched laser, and relates to the technical field of lasers.The application comprises a base, a pumping assembly, a gain medium, a laser oscillation assembly, a heat dissipation assembly and an output mirror, wherein the gain medium, the laser oscillation assembly and the output mirror are detachably installed on the base, the pumping assembly is arranged on the side of the gain medium perpendicular to the optical axis direction, and the heat dissipation assembly is installed on the base.The application is provided with the heat dissipation device, and the components in the heat dissipation bellow are air-cooled, which, in cooperation with the side erbium glass passive Q-switched mode, can effectively improve the laser energy and the beam quality, and can fully dissipate the heat of the components on the optical axis, so that the service life of the components is prolonged while the quality of the output laser is ensured.

The application discloses a device and a method for nonlinear frequency conversion regenerative amplification, and belongs to the technical field of laser nonlinear frequency conversion. The device comprises a signal light injection unit, a regenerative amplification cavity unit and a pump light synchronization unit. The regenerative amplification cavity unit comprises an optical resonant cavity structure module, a polarization control module and a nonlinear action module. The polarization control module is driven by a time sequence controller to form a time domain switch, and the signal light is accurately controlled to circulate in the cavity for a preset number of times. At the same time, the pump light synchronization unit generates a pump pulse train laser which is synchronized with the circulation process and whose sub-pulse power increases in sequence, so that the signal light occurs optical parametric amplification with a corresponding pump sub-pulse in a nonlinear crystal in each circulation. The application converts the spatial complexity of multi-stage amplification into time domain controllability, realizes high-efficiency and high-gain nonlinear frequency conversion by using a single-stage compact structure, and significantly improves the system integration and stability.

The application discloses a low-repetition-frequency optical fiber laser amplifier pump light time-sharing and light-splitting device. The device comprises a pump source, a fiber acousto-optic modulator, a plurality of laser systems and a control unit. The pump source is used for generating pump light; the fiber acousto-optic modulator is connected with the output end of the pump source and is used for receiving the pump light and realizing time-sharing and light-splitting; the plurality of laser systems are respectively connected with the light-splitting output ends of the fiber acousto-optic modulator to form respective light-splitting branches and are used for receiving time-sharing pump light and performing laser amplification; and the control unit is connected with the fiber acousto-optic modulator and is used for controlling the time-sharing and light-splitting operation of the fiber acousto-optic modulator according to a preset time sequence. The device structure in the technical scheme of the application is relatively simple, easy to realize and integrate, the pump light is time-shared and light-split by the acousto-optic modulator, the ASE during the fiber laser amplification can be obviously inhibited, the beam quality and power stability of the laser output are improved, and the reasonable distribution and efficient utilization of the pump light in the plurality of laser systems can be realized.

The application provides a Debye temperature operating laser device, which comprises a vacuum cavity, a laser gain medium and a heat sink sample table located in the vacuum cavity, the heat sink sample table is used to fix the laser gain medium, a pumping module is used to provide pumping light for the laser gain medium, and a temperature adjusting module is correspondingly matched with the heat sink sample table, the temperature adjusting module is configured to adjust the temperature of the heat sink sample table so that the working temperature of the laser gain medium is stably kept at the Debye temperature. The Debye temperature operating laser device is used to realize the operation of the laser gain medium at the Debye temperature, which can theoretically improve the thermal and optical performance, obtain laser output with high power, high beam quality and high efficiency, and provide support and impetus for the application and development of laser technology.

The utility model discloses a critical space laser ranging device, including laser emission module and receiving module, laser emission module includes laser, emission lens barrel and emission collimating optical system, and the laser is fixed at the back end of emission lens barrel, and emission collimating optical system is located in emission lens barrel, and emission collimating optical system includes first double concave lens, first double convex lens, second double concave lens and second double convex lens, receiving module includes receiving lens barrel, focusing system and detector, and focusing system is located in receiving lens barrel, and focusing system includes third double convex lens, first meniscus and second meniscus, and the detector is fixed at the back end of receiving lens barrel. The utility model improves laser emitter's output power density and beam quality, realizes the spatial concentrated distribution of energy through the divergence angle of emission beam is suppressed, and the focusing characteristic of echo beam is optimized simultaneously, improves the optical coupling efficiency, thereby enhances the signal to noise ratio of detector receiving signal.

The invention is suitable for the technical field of optical systems, and provides an astigmatism compensation optical gain cavity laser system which comprises an incident laser system, an optical cavity system and a feedback system. According to the astigmatism compensation optical gain cavity laser system, the incident laser system, the optical cavity system and the feedback system are arranged, and the astigmatism compensation optical gain cavity device remarkably improves the optical cavity coupling rate through optical matching and photoelectric modulation of the incident laser system; a 90-degree included angle cylindrical mirror group arranged in the optical cavity system is utilized to accurately eliminate astigmatism and realize regulation and control of the size of a light spot, so that the laser keeps circular Gaussian fundamental mode operation; by combining the PDH technology and PID control of a feedback system, stable locking of the laser and the optical cavity is realized, the device can effectively solve the problem of light spot ellipse caused by astigmatism in the optical cavity, the laser conversion efficiency and stability and the light beam quality are remarkably improved, and finally a laser system with high efficiency and good stability and light beam quality is obtained.

The invention discloses a metasurface integrated Micro-LED structure with light beam shaping and light extraction enhancing functions, the structure comprises a Micro-LED chip and a single-layer metasurface structure directly integrated on the light emitting surface of the Micro-LED chip, and the metasurface is composed of a plurality of sub-wavelength nano units arranged in a two-dimensional array. Wherein the sizes and the space periods of the nano units are cooperatively designed according to the light-emitting center wavelength of the Micro-LED, the distance from a light-emitting layer in the chip to a light-emitting surface and a preset deflection angle of a light beam, so that phase delay values introduced by the units jointly form a composite two-dimensional phase distribution. According to the phase distribution, firstly, divergent spherical wavefront is reconstructed into collimated wavefront by compensating an optical path difference so as to enhance light extraction, and secondly, a linear phase gradient is superposed so that an optical axis of a whole outgoing beam generates a preset deflection angle. According to the invention, the functions of a complex optical system are integrated on a chip layer, and the integration of efficient collimation, directional emission and light extraction enhancement of light beams is realized.

The application belongs to the technical field of semiconductor laser, and relates to a high-performance VCSEL semiconductor laser based on a diamond film. The application aims to solve the problems of low working temperature (600), wide line width and poor beam quality of the VCSEL. The main scheme comprises a substrate (101), a heat dissipation layer (102), a first electrode (103), a first DBR reflection layer (104), a first oxidation limiting layer (105), an active layer (106), a second oxidation limiting layer (107), a second DBR reflection layer (108), and an insulating heat dissipation layer (109) arranged from bottom to top. The insulating heat dissipation layer (109) is provided with a second electrode (110) connected with the second DBR reflection layer (108), and the second electrode is covered with a heat insulation layer.

The invention provides a power self-locking system, a power self-locking method and a fiber laser bi-pass amplification device. According to the power self-locking system, the power self-locking method and the optical fiber laser bi-pass amplification device, three hundred watts laser in hundred femtosecond magnitude can be output, and meanwhile, the compact laser layout is achieved. The laser has the advantages of simple and compact structure, low cost, one-way laser output, narrower pulse width, higher beam quality and the like, can be widely applied to the fields of national defense and military industry, biomedical treatment, laser processing, scientific research and the like, and has good application prospects and commercial values.