21 results about "Random laser" patented technology

The electro-absorption modulated laser comprises a substrate, a buffer layer, a lower waveguide layer, an active layer region, an upper waveguide layer and a cover layer from bottom to top in sequence, electromagnetic isolation regions are formed in the upper waveguide layer and the cover layer, and a DFB laser and an EAM modulator are formed on the two sides of each electromagnetic isolation region respectively; a grating layer is arranged in an upper waveguide layer of the DFB laser, one end of the grating layer extends to an electromagnetic isolation area, a waveguide area is arranged between the other end of the grating layer and the end of the DFB laser in a spaced mode, in the preparation process, the coupling butt joint face of the DFB laser and the EAM modulator is etched, and then a passive InGaAsP body material is grown for the second time; compared with a traditional electro-absorption modulated laser, the problem of grating random truncation caused during cleavage is solved in a DFB laser area, so that generation of laser random phases is avoided; optimization design is carried out on a butt joint coupling interface, so that the tidiness of the butt joint interface is improved, and the phenomenon of light scattering caused by an uneven interface is avoided; therefore, the laser has better structural characteristics, the yield of the laser is improved, the beam quality of the laser is improved, and the transmission distance of the laser is prolonged.

The utility model provides an adjustable random laser sample clamp which comprises a supporting frame, an adjusting frame and two sliding seats movably installed on the adjusting frame, the adjusting frame is rotatably installed on the supporting frame, an adjusting mechanism is arranged on the supporting frame, folded plates are rotatably arranged on the sliding seats, the middle portions of the folded plates are rotatably connected with the sliding seats, and the middle portions of the folded plates are rotatably connected with the sliding seats. The fixing plates, the elastic pieces and the fasteners are arranged on the sliding seats, the cushion blocks are detachably arranged on the fixing plates, when the sample clamping device is used, the two sliding seats can be fixed through the fasteners so that the distance between the two sliding seats can be adjusted according to the length of a sample, and the sample clamping device is suitable for clamping samples of different lengths; the elastic piece acts on the folded plate to drive one end of the folded plate to elastically abut against the cushion block to clamp a sample, the cushion blocks of different sizes can be replaced to adjust the clamping force between the folded plate and the cushion block, and the angle position of the adjusting frame can be adjusted through the adjusting mechanism according to needs so as to adjust the angle position of the sample. Experimental operation is facilitated, and experimental requirements are met.

The utility model provides a random laser experiment mounting rack with a sleeve structure, which comprises a rack body, a mounting table, an objective table, a clamping assembly, an adjusting assembly, a shading cylinder and an adjusting disc, the side surface of the shading cylinder is provided with an entrance port and an exit port, the adjusting disc is rotatably arranged on one side of the shading cylinder, a plurality of lenses are detachably arranged on the adjusting disc, and the lenses are fixed on the rack body. A sample is fixed to the objective table through the clamping assembly, the whole sample is covered with the shading cylinder, laser irradiates the sample from the incident port and is emitted out from the emergent port, most of light is shaded through the shading cylinder, light pollution is reduced, the position, irradiated by the laser, of the sample can be adjusted by adjusting the position of the objective table through the adjusting assembly, and experimental research is facilitated; and the different lenses are driven to be aligned with the emergent ports by rotating the adjusting disc, so that the light rays can be researched at different refraction angles, the operation is simple, and various experiment requirements can be met.

The invention relates to a deep blue light random fiber laser based on a femtosecond active phase shift fiber grating, and relates to the technical field of laser. Comprising a 900nm random laser seed light source, a collimator, a first plano-convex lens, a frequency doubling crystal, a temperature control platform, a second plano-convex lens and a beam splitter prism, 900nm random laser enters the collimator; a light beam enters the frequency doubling crystal, the frequency doubling crystal efficiently absorbs 900nm wave band random laser through the CuFe2O4 metal nanoparticle film, and the output end face is plated with a 450nm anti-reflection film; the first plano-convex lens and the second plano-convex lens enable the optimal focusing waist spot of 900nm random laser to be at the central position of the frequency doubling crystal; 900 nm and 450 nm random laser is collimated through a second plano-convex lens, the 900 nm random laser is separated through a beam splitter prism, and 450 nm deep blue light random laser output is obtained. According to the invention, blue light random laser output with high stability, low phase noise and low coherence is obtained.

The invention discloses a compact tunable narrow-linewidth fiber laser light source, and belongs to the field of fiber lasers. The structure comprises a Brillouin pump and a Brillouin semi-open annular random fiber cavity. The Brillouin pump adopts a tunable laser and provides pump light for the Brillouin semi-open annular random optical fiber cavity. The erbium-doped optical fiber in the cavity serves as a nonlinear Brillouin gain medium and a linear gain medium at the same time, the narrowband gain of Stokes light is achieved through the stimulated Brillouin scattering effect in the optical fiber, laser output of different wavelengths can be achieved by adjusting the wavelength of Brillouin pump light and matching the center wavelength of the tunable filter, and the laser output of different wavelengths can be achieved. Random distributed feedback is introduced through the random fiber bragg grating to form random laser oscillation, the cavity length is greatly shortened, the line width is deeply compressed, and ultra-narrow line width tunable laser output is achieved while it is guaranteed that the structure of the laser light source is compact. According to the invention, the application of the tunable narrow linewidth laser in the aspects of optical fiber communication, biomedical imaging and the like is expanded.

The application belongs to the technical field of laser, and relates to a method for manufacturing a PVA / dye flexible random laser based on an electrostatic spinning method. A mixed solution of PVA, ovalbumin, rhodamine dye and Au nano-particles is adopted, the sample size and the morphology of the spinning structure are controlled by controlling the voltage, the spraying distance and the needle tip size in the electrostatic spinning technology process, and then the wavelength and the mode of laser emission and other parameters are adjusted. The design is simple and intuitive, the method is flexible and convenient, the principle is reliable, and the method is easy to realize. The obtained flexible random laser is easy to be coupled with other photon devices, and the quantitative control of the laser property is easy to be realized.

The application relates to a deep blue random fiber laser based on a femtosecond active phase shift fiber grating and relates to the technical field of lasers. The application comprises a 900nm random laser seed light source, a collimator, a first plano-convex lens, a frequency doubling crystal, a temperature control platform, a second plano-convex lens and a beam splitter prism; the 900nm random laser enters the collimator; the light beam is incident into the frequency doubling crystal, the frequency doubling crystal is high-efficiency absorbed to the 900nm waveband random laser through a CuFe2O4 metal nanoparticle film, and the output end face is coated with a 450nm antireflection film; the first plano-convex lens and the second plano-convex lens make the optimal focusing waist spot of the 900nm random laser be at the center position of the frequency doubling crystal; the 900nm and 450nm random lasers are collimated through the second plano-convex lens, the 900nm random laser is separated through the beam splitter prism, and the 450nm deep blue random laser output is obtained. The application obtains the blue random laser output with high stability, low phase noise and low coherence.

The application discloses a wavelength-tunable visible light system based on a random fiber laser, which comprises a random fiber laser module, a first isolator, a fiber amplifier module, a second isolator, a dual-wavelength tunable Raman random laser module, a third isolator and a nonlinear frequency conversion module which are sequentially connected. The random fiber laser module is used for outputting tunable wavelength ytterbium-doped random laser. The fiber amplifier module is used for amplifying the optical power of the ytterbium-doped random laser to obtain amplified ytterbium-doped random laser. The dual-wavelength tunable Raman random laser module is used for outputting dual-wavelength tunable Raman random laser. The nonlinear frequency conversion module is used for converting the dual-wavelength tunable Raman random laser into tunable visible light random laser. The application can realize the output of wavelength-tunable visible light random laser, and there is no gap in the whole adjustment range.

The invention provides a public safety patrol system and method based on laser calibration visual obstacle avoidance. According to the public safety patrol system and method based on laser calibration visual obstacle avoidance, a non-coding, irregular and dynamically changeable random laser dot matrix is projected to a front environment; acquiring a scene image containing laser dot matrix light spots; inverting the particulate matter concentration and visibility score of the current environment based on a Mie scattering model; fusing the light spot deformation depth and the light spot visual depth to obtain space depth information of the obstacle; fitting the three-dimensional contour of the obstacle according to the space depth information of the obstacle, identifying the material category of the obstacle through a classifier, and generating a collision-free early warning profile and a real-time path based on the distance, contour and material information of the integrated obstacle and the position of the robot; according to the invention, obstacle perception can still be stably realized in scenes of no light, weak light, smog, dust and the like; the method has the advantages of low cost, high robustness, high response speed, high material identification capability and the like, and can be widely applied to public scenes such as mine patrol and underground pipe gallery patrol.

The application belongs to the technical field of semiconductor lasers, and discloses an integrated chip, a manufacturing method of the integrated chip and a semiconductor random laser. The integrated chip comprises ring mirrors, the ring mirror comprises a ring mirror waveguide and a directional coupler, the two ends of the ring mirror waveguide are connected with the ports on the corresponding sides of the directional coupler, the number of the ring mirrors is set to be multiple, the multiple ring mirrors are connected in sequence to provide random feedback, two adjacent ring mirrors are connected through a connecting waveguide, and the ring mirror located at one end is connected with a light output waveguide on the side away from the adjacent ring mirror. The semiconductor random laser comprises the integrated chip, and further comprises a semiconductor optical amplifier, the semiconductor optical amplifier is connected with the light output waveguide of the integrated chip, and the output end of the semiconductor optical amplifier is provided with a reflection structure corresponding to the light output waveguide. The integrated chip provided by the application is used as the feedback structure of the semiconductor random laser, has the advantages of simple structure, high integration, and greater reflection bandwidth and higher feedback strength.

The invention discloses an encryption and decryption system and method based on random laser chaotic signal generation, a transmitting end, a first reflector, a first continuous wave laser, a first circulator and a first optical coupler of the system are connected in sequence, and a second continuous wave laser is connected with the first circulator to obtain a common optical chaotic signal; the first optical coupler divides a common optical chaotic signal into a plurality of beams, each beam of optical chaotic signal sequentially passes through a tunable optical filter, a tunable dispersion compensator and the like to obtain optical chaotic signals with different parameters, then the optical chaotic signals enter a first phase modulator, and the first phase modulator is connected with a first dispersion element; the first phase modulator is connected with a second phase modulator at a receiving end; in the receiving end, a second reflecting mirror, a third continuous wave laser, a second circulator and a second optical coupler are connected in sequence, and a fourth continuous wave laser is connected with the second circulator; the second optical coupler divides the public optical chaotic signal into a plurality of beams, each beam of optical signal sequentially passes through a tunable optical filter, a tunable dispersion compensator and the like and then enters a second phase modulator to obtain a random laser chaotic signal synchronous with a transmitting end, and the second phase modulator is connected with a second dispersion element.

The application provides a fiber vortex random laser integrated with multiple orbital angular momentum modes and a preparation method thereof, and a vortex random laser generating device and method, and belongs to the technical field of lasers; the problems of the existing vortex random laser, i.e., the radiation direction to be optimized and the system integration to be strengthened, are solved; the fiber vortex random laser integrated with multiple orbital angular momentum modes comprises a microfluid channel, a single-mode optical fiber, an optical fiber splitter and an optical fiber integrated with a spiral phase plate; a gain medium and scattering particles are arranged in the microfluid channel; one end of the single-mode optical fiber is fixed in the microfluid channel; the other end of the single-mode optical fiber is coupled with an end face of the spiral phase plate of the optical fiber integrated with the spiral phase plate through the optical fiber splitter; the spiral phase plates of different optical fibers integrated with the spiral phase plates carry different topological charges, and the vortex random lasers carrying different orbital angular momentum modes are formed; the application is applied to the random laser.

The invention discloses an optical fiber random laser speckle-free illumination method based on a disordered disturbance multimode optical fiber, which relates to the field of laser illumination imaging and comprises a pumping source, a reflector, a first wavelength division multiplexer, a high-nonlinearity optical fiber, a second wavelength division multiplexer, an isolator, an attenuator, a multimode optical fiber, a signal generator and a multimode optical fiber disturbance device. And three effect verification assemblies including a lens, ground glass and an infrared camera. Pump light is injected into the optical fiber link through the first wavelength division multiplexer, the multi-mode optical fiber is arranged in the multi-mode optical fiber disturbance device, a driving power supply is provided for a piezoelectric ceramic piece in the multi-mode optical fiber disturbance device through the signal generator, and other components are sequentially connected end to end. According to the built optical fiber random laser, Rayleigh scattering of a high-nonlinearity optical fiber and a reflector are adopted for providing optical feedback, time and space disordered disturbance is applied to laser in a multimode optical fiber through a piezoelectric ceramic piece, space coherence is reduced, and the laser serves as an illumination light source for speckle-free imaging after being collimated.

The invention discloses a random microlens array and a manufacturing method thereof, and belongs to the technical field of semiconductor device manufacturing processes. Aiming at the problems that the structure is not real and random, the template dependence is strong, the morphology is difficult to continuously regulate and control, the process is complicated, the efficiency is low and the random micro-lens array is not suitable for large-area processing in the existing random micro-lens array preparation method, laser of an ultraviolet wave band is irradiated to the surface of a diffuser by utilizing a laser speckle gray scale photoetching system; forming a laser speckle pattern with statistical randomness, taking the intensity distribution of the laser speckle pattern as a natural gray level mask, and transferring the intensity distribution to the photoresist on the surface of the transparent substrate in a gray level exposure mode to form a three-dimensional free-form surface micro-lens morphology which is arranged in a non-periodic manner and has continuous change; therefore, a random micro-lens array preparation scheme which is real and random in structure, adjustable in height, free of a template and simple in process is realized.

The application discloses a double-pump cascade type super-narrow linewidth Brillouin random laser, which comprises a pump laser, a fiber amplifier, an optical isolator, a fiber coupler, a first fiber circulator, a second fiber circulator, a third fiber circulator, an adjustable fiber attenuator, a first Brillouin gain fiber, a second Brillouin gain fiber and a tunable filter; the application adopts two optical fibers which are subjected to stimulated Brillouin scattering frequency shift superposition, stimulated Brillouin scattering occurs in the first Brillouin gain fiber, Stokes light generated by the first Brillouin gain fiber is further provided with a Stokes light signal source for the second Brillouin gain fiber after passing through the adjustable fiber attenuator, meanwhile, Rayleigh scattering occurs in the second Brillouin gain fiber and provides random feedback for the first Brillouin gain fiber after passing through the third fiber circulator; in the system, higher Brillouin gain is realized, laser linewidth can be further compressed, and finally super-narrow linewidth random laser is output.

The present invention discloses a method for reverse design of a dissipative soliton resonant laser based on machine learning. The method comprises the following steps: 1) establishing two sets of associated data sets, one for training an SVM and the other for training a BP neural network. The SVM is used to predict the convergence of the dissipative soliton resonant pulse, and the other for predicting the laser output time domain and spectral waveform. 2) initializing a PSO algorithm particle swarm, with each particle's position parameter corresponding to a set of random laser cavity parameters. The SVM model is pre-input to filter out particles that meet the convergence criteria and reuse them as the initial particle swarm. 3) Iteratively updating the particle position information and inputting it into the BP neural network to predict the pulse time domain and spectral waveform information. When the mean square error between the predicted waveform and the set target waveform is lower than a set value, a set of optimal laser cavity parameters is output, thus achieving laser reverse design. The present invention effectively solves the problem of difficult design of dissipative soliton resonant fiber lasers under conditions of low absolute net cavity dispersion.

This invention relates to the field of organic photonics and laser device technology, specifically disclosing a laser based on a mesoporous titanium dioxide substrate and its fabrication method. The laser comprises a transparent substrate, a mesoporous titanium dioxide thin film on the substrate, and an organic conjugated polymer gain medium layer on the titanium dioxide thin film. The mesoporous titanium dioxide layer is fabricated by spraying or spin coating, utilizing its disordered porous structure to provide light scattering feedback. Low-threshold random laser emission can be achieved under optical pumping without the need for a traditional precision resonant cavity. This device features a simple structure, low fabrication cost, good process compatibility, and applicability to polymer gain media with various emission wavelengths, providing a new technical path for realizing low-cost, easily integrated electrically pumped organic lasers.

A surface emission random laser and a manufacturing method thereof, wherein the random laser comprises: a semiconductor die (1) comprising a plurality of semiconductor layers; two or more electrodes (2), attached to the semiconductor die (1) for current injection; an optically active layer (3) placed between two semiconductor layers to produce optical amplification as a response to the current injection; two planar confinement layers (4), arranged over and under the optically active layer (3) configured for light confinement; and one or more scattering elements (5), being holes or grooves drilled in the semiconductor die (1) and extending at least to reach the optically active layer (3) and defining scattering rough surfaces (7) divided into: a proximal scattering surface (8) for optical feedback; and a distal scattering surface (9) for light extraction (6).

The invention belongs to the field of spectral analysis, and provides a broadband tunable fiber laser device based on wavefront regulation, which comprises a pumping source 1, a fiber bragg grating 2, a first wavelength division multiplexer 3, a true wave fiber 4, a second wavelength division multiplexer 5, a dispersion shifted fiber 6, an isolator 7, a collimating lens 8, a digital micromirror device 9, a coupling objective lens 10, a multimode fiber 11 and a fiber coupler 12. According to the invention, the Rayleigh scattering effect in the optical fiber and the nonlinear effect of the true wave optical fiber are utilized to simultaneously generate the first-order broadband random laser and the first-order super-continuum laser as pumping sources of the super-continuum laser, so that the spectrum is rapidly broadened to generate the stable broadband super-continuum laser, and the generation of the second-order random laser is effectively inhibited; in addition, a digital micromirror device is used for carrying out wavefront modulation on the broadband super-continuous laser, and wavelength microsecond-level fast tuning is achieved; in addition, higher complexity is brought to randomness of the multi-mode optical fiber through the bent fixing device, and the length of the multi-mode optical fiber is effectively shortened.

The present invention discloses a laser display panel with a self-healing function and a method for constructing the same. The laser display panel comprises a periodically arranged RGB pixel array unit, which includes a self-healing polymer micro-template and random lasers. The self-healing polymer micro-template serves as a blank pixel, and the random lasers are uniformly filled within the blank template. The random lasers contain a gain medium and a scattering medium. The random laser micro-laser pixel array of the present invention has a periodic arrangement, facilitating mixed-color laser output and full-color laser display under specific excitation modes. Furthermore, the self-healing laser display panel of the present invention can self-repair even when scratched, maintaining its laser performance and maintaining a stable display effect.

An ultrafast random laser fast pulse width measuring instrument comprises a beam splitter, a wedge-shaped mirror, a high reflective mirror, a first cylindrical lens, a second cylindrical lens, a first convex lens, a frequency doubling crystal, a second convex lens, a time delay optical fiber array, a photoelectric detector and an oscilloscope. After a to-be-measured light beam is split, one path of light is inclined through a wedge-shaped mirror, then interferes with the other path of light and then is subjected to frequency multiplication, time domain waveforms are converted into spatial intensity distribution, time domain broadening of pulses is achieved through a space division delay optical fiber array, sampling is conducted through a conventional oscilloscope, and therefore rapid measurement of the waveforms and the widths of the ultrafast pulses is achieved. Time switching is realized by adopting a pulse tilt interference method, pulse time broadening is realized through optical fiber array space division delay, high-precision rapid measurement of ultrashort pulses can be obtained by using a common oscilloscope, an unrepeatable optical dynamic process can be rapidly represented, and the method has the advantage of low cost and is suitable for large-scale popularization and application. The method is a novel ultrafast laser pulse measuring technology with high cost performance.