39 results about "Greenlight laser" patented technology

The invention relates to a dual-wavelength laser annealing device and a method thereof. The dual-wavelength laser annealing device comprises a green laser device and an infrared laser device; an output optical path of the green laser device is sequentially provided with a beam expanding module, a green light bar-type spot reshaping module, and a green light 45-degree reflector; an output optical path of the infrared laser device is sequentially provided with an infrared bar-type spot reshaping module, and an infrared 45-degree reflector; output optical paths of the green light 45-degree reflector and the infrared 45-degree reflector are provided with a beam combining projection focus lens; an output optical path of the beam combining projection focus lens is provided with a variable diaphragm; and an output end of the variable diaphragm is directly opposite to a machining platform. Two laser beams are combined into one beam via the optical assembly; the combined laser beam is converted from a circular Gaussian distribution into a bar-type Gaussian distribution after being coordinated, adjusted and converted among optical elements; the laser is a bar-type light spot after the beam combination; the introduction of the infrared wavelength provides a deeper annealing depth for the light spot, makes the temperature rise at the moment that the laser contacts with the surface of material, thereby increasing the activation rate of implanted ions; and therefore the machining effect is better.

The invention relates to a ytterbium-doped crystal as well as a growth method and application thereof. The molecular formula of the ytterbium-doped crystal is Ca3-3xYb3xRGa3Si2O14, wherein R represents an Nb ion or a Ta ion, and the doping concentration of a Yb ion is 0.1at.%-50at.%. The ytterbium-doped simultaneously has a laser emission effect and a nonlinear optical effect and is a self-frequency-doubling laser crystal with excellent performance. Compared with a laser device formed by combining laser crystals with nonlinear optical crystals, a self-frequency-doubling green laser device prepared from the ytterbium-doped crystal has the advantages that the volume is relatively small, the structure is relatively compact, the production cost is greatly lowered, meanwhile, the machining and assembling links are simplified, and the production efficiency is improved.

The invention discloses an intelligent traffic light with a high warning property. The intelligent traffic light comprises a supporting stand column, a laser projection module and a traffic control system. The LED light source module comprises red light, green light and yellow light and provides a road surface signal command function; the light sources are a red laser light source and a green laser light source; the laser projector projects the light source and emits projection light beams to form a light beam fence on the road surface, a central control panel sets the width and the length ofthe projection light beams according to the detection result of the projection area detection unit, and the optimal warning effect is achieved under the condition that the necessary sight line is notblocked. The light source intensity value of the projection light beams is set according to the detection result of a photosensitive sensor so that the highest warning effect is achieved, and the light source light-emitting effect is kept consistent with the light-emitting effect of the LED light source module; and the data analysis module analyzes the personnel and vehicle flow of the road section according to the detection result of the flow detection module, and the working states of the light source and the LED light source module are adjusted through the timing setting module.

The invention discloses a high-stability air-cooled green laser which comprises a pumping source, a collimating lens group, a rear cavity mirror, a laser crystal, a Q-switched crystal, a polaroid, a frequency doubling crystal, a 0-degree two-point reflector, a 45-degree spectroscope, a window mirror and a beam expanding lens group. Pump light emitted by the pumping source is reflected after passing through the collimation photoscope group, the rear cavity mirror, the laser crystal, the Q-switched crystal, the polaroid, the frequency doubling crystal and the 0-degree double-point reflector, passes through the frequency doubling crystal again, is reflected to the 45-degree spectroscope on the surface of the polaroid, passes through the window mirror and is finally emitted out through the beam expanding photoscope group. Cooling fins are embedded in the surface of the laser shell and are of a fin structure, a fan is installed outside the shell, and the cooling fins dissipate heat in an air cooling mode. The device is simple and compact in structure, convenient to carry, capable of achieving industrial batch production, good in output light beam quality, narrow in pulse width, adjustable in repetition frequency and the like, and can be widely applied to the fields of laser radar, medical treatment, scientific research and the like.

The invention discloses a large-color-gamut laser light source system integrated through trapped wave beam combination. The system comprises a blue laser light source I1, a green-light-reflecting blue-transmitting beam combiner 2, a green laser light source 3, a blue excitation light source 5, a red-light-reflecting blue-green-transmitting beam combiner 6, a fluorescence unit 7 and a red laser light source 9. The light beam emitted by the blue laser light source I1 sequentially passes through the green-light-reflecting blue-transmitting beam combiner 2, a light equalizing sheet I4a, the red-light-reflecting blue-green-transmitting beam combiner 6, a red trapped wave filter 10 and a lens group II11 and enters a light guide tube 12; and the light beam emitted by the green laser light source3 sequentially passes through the green-light-reflecting blue-transmitting beam combiner 2, the light equalizing sheet I4a, the red-light-reflecting blue-green-transmitting beam combiner 6, the red trapped wave filter 10 and the lens group II11 and enters the light guide tube 12. The RGB laser light source coupled integrated system realizes a multi-light-source high-efficiency super-small-size coupling mode, can meet the requirements of a large color gamut Rec.2020, and meanwhile, is high in cost performance and wide in working temperature application range.

The invention provides a subnanosecond green laser. The subnanosecond green laser comprises a subnanosecond seed source for emitting seed light, a multi-stage amplification structure for performing multi-stage amplification on the seed light, and a frequency doubling conversion structure for performing frequency doubling conversion on the amplified seed light, the multi-stage amplification structure comprises a first-stage amplification light path, a second-stage amplification light path and a third-stage amplification light path; the first-stage amplification light path comprises a first seed light path, a first laser crystal, a 0-degree reflecting mirror and a first pumping module which are arranged in sequence; the second-stage amplification light path comprises a second seed light path, a second laser crystal, a 0-degree reflecting mirror and a second pumping module which are arranged in sequence; and the third-stage amplification light path comprises a third seed light path, a third laser crystal, a pumping spectroscope and a third pumping module which are arranged in sequence. According to the subnanosecond green laser provided by the invention, the output green laser has the characteristics of high repetition frequency, high average power and high monopulse energy, and can meet market application requirements.

The invention relates to a passive Q-switched pulsed self frequency doubling green light laser which comprises a pump source, a self frequency doubling laser crystal, a saturable absorber and a resonant cavity output lens which are orderly arranged along an optical path. The self frequency doubling laser crystal is Nd:YCOB crystal or Nd:GdCOB crystal, the length of a light passing direction is 6 to 15 mm, a cutting direction is a 1064 nm frequency doubling phase matching direction, the doping concentration of strontium ions is 1 to 20 at.%, and the material of the saturable absorber is a two-dimensional material SnSe2. According to a film-like saturable absorber modulated self frequency doubling laser made of the two-dimensional material in the invention, continuous wave self frequency doubling light is converted into pulse self frequency doubling laser with a short pulse width, a high peak power and high repetition frequency. The saturable absorber used in the invention has the advantages of simple preparation process, low production cost, high efficiency and easy assembly, and the produced pulse self frequency doubling laser has the advantages of small volume and good performance, and the large-scale promotion and use are facilitated.

The invention belongs to the technical field of beam conversion, in particular to a method for generating Bessel-like beams by growing microcones on the end faces of optical fibers. The invention includes: depositing a photopolymer liquid reagent on the end face of a single-mode fiber, coupling a green laser into the single-mode fiber through a lens, and reacting with the photopolymer liquid reagent deposited on the end face of the single-mode fiber to form a polymer microcone; After passing through the polymer microcone formed on the fiber end face, it transforms into a Bessel-like beam. The shape of the microcones is controlled by photopolymerization parameters such as green laser power, laser exposure time, and oxygen diffusion concentration. The working bandwidth of this microcone covers the entire visible light region and even the near-infrared band, and can have more than 30 concentric rings at most, and the generated Bessel-like beam has self-restoring properties. The method of the invention is efficient, low-cost, and convenient, and can be widely used in the fields of particle manipulation, optical imaging, nonlinear optics, photolithography, micro-manufacturing, and the like.

An underwater quenching method for a thin steel plate, the method comprising: polishing, cleaning, and decontaminating the surface of a substrate; placing the pretreated substrate in a water tank, and completely submerging the upper surface of the substrate in water, and using a wavelength The blue / green laser with a range of 400-600nm scans the surface of the substrate, and at the same time, a side blowing device is used to blow off the water vapor generated in the laser quenching process in time; The rapid rise of the temperature of the workpiece makes the surface temperature of the material rise above the austenite transformation temperature. The heat of the processed part of the thin steel plate is absorbed by the water layer on the upper surface of the thin steel plate. The cooling water absorbs the heat and vaporizes violently, taking away a large amount of heat. The thin steel plate is cooled rapidly, so as to meet the requirements of the thin steel plate to be hard on the outside and tough on the inside, and at the same time reduce the thermal influence on the base part.

The invention discloses an all-solid-state blue-green laser based on a thulium-doped ion crystal. The all-solid-state blue-green laser comprises an excitation source, a gain medium, a nonlinear frequency doubling crystal, an endoscope system and a tuning element, the plane mirror, the gain medium, the tuning element and the plane-concave cavity mirror are sequentially arranged along the laser output direction of the excitation source; a nonlinear frequency doubling crystal and a plano-concave rear cavity mirror are sequentially arranged in the direction of a reflection light path of the plano-concave cavity mirror, wherein a certain angle is formed between the plano-concave rear cavity mirror and the front light path; and the plane mirror, the plano-concave cavity mirror and the plano-concave rear cavity mirror jointly form a folded resonant cavity. Pump light emitted by the excitation source is injected into the gain medium after being collimated and focused, and output mid-infrared laser with the wavelength of 1.85-2.1 microns is converted by the nonlinear frequency doubling crystal to output blue-green laser with the wave band of 462.5-525nm. The laser has the advantages of abundant emission wavelength, tunable laser wavelength, high output power, high stability, simple structure, small size and the like.

The invention discloses a gallium nitride-based green laser and a preparation method thereof. The gallium nitride-based green laser comprises a gallium nitride single crystal substrate, an n-GaN layer, an n-AlGaN / GaN superlattice limiting layer, a lower waveguide layer, an active region, a p-type electron blocking layer, an upper waveguide layer, a p-AlGaN / GaN superlattice limiting layer and a p-GaN contact layer which are sequentially stacked from bottom to top, wherein the active region is of a quantum well structure with variable temperature and variable growth rate, and the lower waveguide layer and the upper waveguide layer are gradient doped composite waveguide layers. According to the invention, the InGaN / InGaN quantum well structure with variable temperature and variable growth rate serving as an active region, the gradient doped u-InGaN+u-GaN+p<+>-AlGaN composite upper waveguide layer and the gradient doped n<+>-Aly1Ga<1-y1>N+n-GaN+u-GaN+u-Inx5Ga<1-x5>N composite lower waveguide layer are arranged, so that the optical absorption loss of the P-type layer of the laser is effectively reduced, the quantum efficiency of the laser is improved, and the green light emitting intensity of the gallium nitride-based green light laser is further improved.

The invention discloses a preparation method of a solid laser working substance with dye laser properties, and the solid laser working substance prepared by the method overcomes the critical defect that the laser is large in size and limited to use due to the complex optical path structure of the dye laser; a laser made of the laser working medium is the same as a common solid laser and has the advantages of being simple in structure, small in size and convenient to carry. Pumping is carried out within the range that a pumping light source is 945 nm to 980 nm, green light of 525 nm can be directly generated, and the single-machine continuous laser power can easily reach 40 watts and is about eight times that of an existing mainstream green laser under the same condition. According to the resonant cavity provided by the invention, the sheet is arranged between the first lens and the second lens, so due to a laser manufactured by the resonant cavity, a frequency doubling optical device in a traditional green laser is saved, the structure of the traditional green laser can be simplified, and the light conversion rate of the laser is improved.