12 results about "Random laser" patented technology

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 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 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.

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.