38results about How to "Low damage threshold" patented technology

A method of depositing various materials onto heat-sensitive targets. Heat-sensitive targets are generally defined as targets that have thermal damage thresholds that are lower than the temperature required to process a deposited material. The invention uses precursor solutions and / or particle or colloidal suspensions, along with optional pre-deposition treatment and / or post-deposition treatment to lower the laser power required to drive the deposit to its final state. The present invention uses Maskless Mesoscale Material Deposition (M3D™) to perform direct deposition of material onto the target in a precise, highly localized fashion. Features with linewidths as small as 4 microns may be deposited, with little or no material waste. A laser is preferably used to heat the material to process it to obtain the desired state, for example by chemical decomposition, sintering, polymerization, and the like. This laser processing may be performed in an ambient environment with laser powers of less than 100 milliwatts.

An anti-resonant hollow core optical fiber having multiple resonant layers. The optical fiber comprises a low-refractive index core region (1) and a high-refractive index cladding region. The high-refractive index cladding region comprises an inner cladding region (4) and an outer cladding region (5). The outer cladding region (5) clads the inner cladding region (4) and the core region (1). The inner cladding region (4) comprises a first anti-resonant layer (2) and a second anti-resonant layer (3), and the first anti-resonant layer (2) and the second anti-resonant layer (3) surround the core region (1); and the first anti-resonant layer (2) comprises several layers of microcapillary tubes, and the second anti-resonant layer (3) supports the first anti-resonant layer (2). The optical fiber adopts a double-cladding structure and uses two or more anti-resonant layers such that theoretically simulated loss is reduced to 0.1 dB / km, and has the features of ultralow transmission loss, wide spectral bandwidth, low bending loss, low transmission loss, high damage threshold and single-mode transmission.

The invention relates to the technical field of laser cutting and discloses a laser through cutting device for a transparent hard and brittle material. The laser through cutting device for the transparent hard and brittle material comprises a laser device, a beam expander, a reflector, an extended depth of focus optical device and a focusing mirror. The laser device receives an external pulse signal and forms a pulse envelope. The pulse envelope is subjected to beam expanding through the beam expander, is reflected by the reflector and then sequentially passes through the extended depth of focus optical device and the focusing mirror to form a laser spot. The focusing spot acts on the machined material to form a material modification channel or a material modification channel cluster penetrating through the material in the thickness direction. The laser through cutting device for the transparent hard and brittle material guarantees that the machined material can crack along a preset path, efficient and precise cutting of the machined material is achieved, and the requirements for high efficiency, high quality and a low damage threshold are met.

The invention relates to an inorganic compound with a non-heart structure, and a preparation method and an application thereof as a nonlinear optical crystal. The crystal has a chemical formula of K2Au(IO3)5, belongs to an orthorhombic crystal system, has a space group of C[mc]2[1], and has crystal cell parameters of a=11.5949(8) angstroms, b=11.6905(6) angstroms, c=11.4716(6) angstroms, alpha=beta=gamma=90 DEG and Z=4. The yellow K2Au(IO3)5 crystal is prepared by a hydrothermal method. The powder frequency-doubling effect of the K2Au(IO3)5 crystal is 1.0 time that of KTiOPO4.

The invention relates to an arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel and a preparation method thereof. The arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel comprises a first dielectric film layer, a first glass substrate, a first chemical film layer, an optical orientation film layer, a liquid crystal layer, a friction orientation film layer, a second chemical film layer, a second glass substrate, a second dielectric film layer and an interval sub frame. According to the panel, arbitrary amplitude shaping binarycoding figure is generated by a silicon substrate photo-etching system which comprises an LED (light-emitting diode) blue light source, an array lens, a collimator, a polarization beam splitter, a silicon substrate liquid crystal space light modulator, an achromatic imaging system and a computer, and the figure is inscribed on the optical orientation film layer of the liquid crystal binary opticalpanel to obtain the arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel. The arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel has the advantages that the panel is rewritable, high in damage threshold and shaping accuracy and the like.

The invention discloses a method for preparing a back incident silicon-based tellurium, cadmium and mercury focal plane anti-reflection film by femto-second laser, and relates to a manufacturing technology for photoelectric detectors. In the method, the anti-reflection film is prepared on the surface of a silicon substrate directly by using a femto-second laser hyperfine 'cold' processing technology; and an appropriate working environment is selected, the appearance of a microstructure is controlled by adjusting parameters such as average power, laser scanning speed and the like of the femto-second laser, and the incident light reflection of the substrate surface is reduced, so that the aim of anti-reflection in an infrared waveband is fulfilled. The anti-reflection film is formed by reconstructing a substrate material under the action of the femto-second laser, so the anti-reflection film has good heat matching with the substrate, and the reliability is high. The femto-second laser hyperfine 'cold' processing method used for preparing the anti-reflection film is simple to operate, and has the advantages of high processing precision and small heat effect, and is particularly suitable for the processing technology of tellurium, cadmium and mercury devices.

The invention discloses a fiber reinforced metallic matrix composite board and a pretreatment method thereof. The composite board is of a multi-layer composite structure, wherein the multi-layer composite structure is obtained by alternatively stacking reinforcing fibers and metallic matrix materials, the reinforcing fibers are carbon fiber cloths or glass fiber cloths with micro mesh woven structures, and the metallic matrix materials are lightweight metal materials with the thickness of 1-3 mm. A femtosecond / picosecond laser welding mode including one of an equal-space spot welding mode, a linear track welding mode and a circular track welding mode or a spiral track welding mode is adopted. According to process parameters, the laser spot beam diameter is 2-100 microns, the laser power is0.1-4 kW, the welding speed is 10-80 mm / min, and the welding current is 50-200 A. By means of the narrow laser spot, nonlinear high absorption rate and high penetration performance of a femtosecond / picosecond laser, bimetallic sheets isolated by the fibers are metallurgically combined through welding at fiber micropores to manufacture the high-strength fiber reinforced metallic matrix composite board.

The invention discloses a multi-stage taper optical fiber phase conjugation mirror and a device and method for laser double-journey amplification of the multi-stage taper optical fiber phase conjugation mirror. The device for laser double-journey amplification comprises a laser, a first polarizing film, a lambada / 2 wave plate, a Faraday magnetic rotation device, a second polarizing film, a laser amplifier, a lambada / 4 wave plate, a first lens, a second lens and multi-stage taper optical fibers, wherein the laser, the first polarizing film, the lambada / 2 wave plate, the Faraday magnetic rotation device, the second polarizing film, the laser amplifier, the lambada / 4 wave plate, the first lens, the second lens and the multi-stage taper optical fibers are sequentially placed in the optical axis direction. The first lens is a convex lens, the second lens is a concave lens, a telescope system is formed by the first lens and the second lens, the focal length f1 of the first lens ranges from 100mm to 1000mm, and the focal length f2 of the second lens ranges from -20mm to -1000mm; the distance D1 between the first lens and the second lens satisfies the equation that D1=f1+f2, wherein the D1 ranges from 20mm to 1000mm. The multi-stage taper optical fiber phase conjugation mirror is high in damage threshold, low in stimulated brillouin scattering threshold, high in reflectivity and wide in dynamic working range, therefore, the conjugation mirror is applied to a high-power laser, and damage is avoided.

The invention belongs to the field of optical thin films, and relates to a high-damage threshold laser lens and a manufacturing method thereof. The laser lens of the invention comprises a substrate and coating layers. The coating layers alternately form multiple zirconia film layers and multiple silica film layers from the surface of the substrate, and the zirconia film layer adopts zircaloy for coating. The manufacturing method of the invention comprises steps of substrate preparation, pre-coating preparation and coating. According to the high-damage threshold laser lens capable of solving alow damage threshold by direct zirconia material evaporation and the manufacturing method thereof, the damage threshold of the zirconia film layer is raised to17J / cm<2> 10ns-coating 355 nm from 5 J / cm<2> 10ns-coating 355 nm.

The invention relates to an integrated optical fiber laser collimator and a manufacturing device thereof. One end of an optical fiber of the optical fiber laser collimator is connected with a laser; the other end is connected with a bucket-shaped sleeve; and a droplet lens is arranged in the sleeve. The manufacturing device of the optical fiber laser collimator comprises a transparent or netted upper electrode, a lower electrode, a high-frequency alternating-current / direct-current power supply, a solidification mechanism and a light beam divergence angle detection device, wherein a through hole is reserved in the centre of the lower electrode; a positioning convex ring is arranged in a lower port of the through hole; the solidification mechanism is an annular ultraviolet source and is positioned between the upper electrode and the lower electrode; and the light beam divergence angle detection device is positioned above the upper electrode. The collimator has a good collimation effect, greatly reduces the optical energy loss of an end surface, and improves an energy transmission threshold. The device combines electric field droplet surface shape regulation and control, liquid micro-lens solidification, and lens surface shape and collimation effect real-time detection, detects a light beam divergence angle in real time, ensures the synchronization of manufacture and detection, and reduces a rejection rate.

The invention discloses an FP cavity adjustable filter, which comprises a pair of a first flat plate and a second flat plate which are mutually spaced and parallel. A plurality of isolation piles withthe same height are uniformly spaced at the peripheral position of a first reflecting film on the first flat plate; a plurality of piezoelectric ceramics are further fixedly installed on the peripheries of the isolation piles, the bottoms of the piezoelectric ceramics are fixedly connected to the first flat plate, and the tops of the piezoelectric ceramics are free ends; through holes are formedat positions right opposite to the piezoelectric ceramics on the second flat plate, the tops of the piezoelectric ceramics are inserted into the through holes; compensation blocks are further fixedlyinstalled on the second flat plate, one ends of the compensation blocks are fixedly connected to the second flat plate, and the other ends of the compensation blocks are inserted into the through holes and in contact with the tops of the piezoelectric ceramics, and the problems that the cavity length uniformity of an existing FP cavity adjustable filter is difficult to guarantee and the damage resistance is poor are solved.

The invention relates to a combined interference chamber for chemical laser device wavelength choice output. A stable chamber structure is adopted in the combined interference chamber which comprisesa recessed surface reflecting mirror, a 45 degree beam splitting sheet and two plane reflecting mirrors. The 45 degree beam splitting sheet and the two plane reflecting mirrors form an interference sub-chamber, and reflecting films having different reflectivity for laser light with different wavelengths are respectively plated on reflecting planes of the recessed surface reflector and the plane reflecting mirrors. Via control over reflectivity parameters of optical elements in a laser resonant cavity, wavelengths of a laser device can be chosen roughly; interference effects are used for closely adjacent wavelengths can be chosen in a careful way via adjustment of parameters such as a length of the interference sub-chamber, a beam splitting ratio of a beam splitting sheet and the like; thelaser device is enabled to output laser light with any single wavelength.

The present invention discloses a preparation method of a plane lens. The method comprises: employing high refraction index nanofluid materials to dropwise add onto loose and porous monolithic gel body materials with low refraction index and high damage threshold, and allowing the refraction index of the monolithic gel body materials to be gradually changed (diffusing from middle portion to transverse direction and vertical direction or diffusing from an edge layer) after the nanofluid materials are permeated through diffusion of the nanofluid materials in the monolithic gel body materials and through adoption of the nanofluid material physical property and the monolithic gel body material porous structure to prepare a plane lens. The preparation method of the plane lens is simple in process, and can control forming of the refraction index of the lens through selection of the nanofluid materials and the monolithic gel body materials, the formed lens has higher transmittance than a lens based on glass materials, a lens with a continuously and gradually changed refraction index prepared by the method can omit the tedious preparation process of a traditional glass-based lens and does not need processes such as grinding, polishing and the like so as to save the production cost, and is an ideal lens with a continuously and gradually changed refraction index.

The invention relates to an all-fiber high-energy super-continuum spectrum laser. The laser comprises a pump laser, an optical fiber amplifier, an optical fiber amplifier tail fiber, a transition optical fiber and a multi-core high-nonlinearity optical fiber, wherein a tail fiber of the optical fiber amplifier, the transition optical fiber and the multi-core high-nonlinearity optical fiber are sequentially welded, so the tail fiber of the optical fiber amplifier is matched with the mode field of the multi-core high-nonlinearity optical fiber, and all-fiber and high-energy output of the super-continuum spectrum laser are guaranteed. According to the all-fiber high-energy super-continuum spectrum laser, the laser with monopulse energy reaching the hundred-microfocus magnitude is used for pumping the multi-core high-nonlinearity optical fiber, and defects of low damage threshold of the single-core high-nonlinearity optical fiber, large welding loss of the multi-core high-nonlinearity optical fiber and the amplifier tail fiber and low coupling efficiency are overcome; the single pulse energy of the super-continuum spectrum laser generated by the invention reaches the micro-focus magnitude, and the working distance of the super-continuum spectrum laser is further improved.

The invention relates to the technical field of ceramic connection, in particular to an ultrafast laser welding method applied to ceramics. According to the method, the joint of the ceramic workpieceis irradiated through ultrafast laser, the ceramic absorbs photon energy, a nonlinear absorption phenomenon is induced under high power density, the ceramic at the focus is fused instantaneously, theatomic activity is greatly improved, and then elements at the joint of the ceramic workpiece are diffused to form welding spots. Due to the fact that the ultrafast laser action time is extremely short, heat cannot be dissipated in time, and a heat-affected zone is extremely small. Reliable connection of ceramic can be achieved by changing relevant parameters of ultrafast laser, and the phenomenonof weld joint cracking caused by thermal stress can be greatly reduced. By the adoption of the method, the welding stress of the weld joint can be reduced, cracks at the weld joint are avoided, and fusion welding of the ceramic is achieved under the condition that ablation does not occur.

The invention belongs to the field of spatial light field regulation and control, and relates to a spatial light modulator coupling device without zero-order diffracted light. The device comprises a sealing box, an asymmetric triangular reflector and a spatial light modulator. The asymmetric triangular reflector and the spatial light modulator are oppositely arranged and are arranged in the sealing box; a light inlet hole and a light outlet hole are formed in the sealing box; incident light sequentially passes through the light inlet hole, the asymmetric triangular reflector, the spatial lightmodulator and the asymmetric triangular reflector and then is emitted out from the light outlet hole. The zero-order diffracted light-free spatial light modulator coupling device has the advantages of high-precision light field regulation and control, zero-order light beam suppression without a spatial filter, modularization and compactness of the spatial light field regulation and control deviceand easiness in combination with other systems.

The invention relates to a manufacturing device of an integrated optical fiber laser collimator. The manufacturing device of the integrated optical fiber laser collimator comprises a transparent or netlike upper electrode, a lower electrode, a high-frequency alternating current-direct current power supply, a curing mechanism and a light beam diffusion angle detection device, wherein the middle part of the lower electrode is provided with a through hole and the lower port of the through hole is internally provided with a positioning convex ring; the curing mechanism is provided with an annular ultraviolet light source and is located between the upper electrode and the lower electrode; and the light beam diffusion angle detection device is located above the upper electrode. The collimator disclosed by the invention has a good collimation effect, and can be used for greatly reducing the optical energy loss of the end face and improving the energy transmission threshold value; the device disclosed by the invention combines steps of regulating surface shape of a liquid drop by an electric field, curing a liquid drop by a micro lens and detecting the lens surface shape and the collimation effect in real time, so as to detect the collimated light beam diffusion angle in real time, guarantee the synchronization of manufacturing and detecting, and reduce the rejection ratio.

The invention relates to a high-damage-threshold liquid crystal optical panel with arbitrary depolarization compensation and an exposure device thereof. The high-damage-threshold liquid crystal optical panel with arbitrary depolarization compensation is composed of a composite layer, and a spacer frame adhesive which coats the composite layer. The composite layer comprises a first dielectric filmlayer, a first glass substrate, a second dielectric film layer, a light-operated alignment film layer, a liquid crystal layer, a friction alignment film layer, a third dielectric film layer, a secondglass substrate and a fourth dielectric film layer which are sequentially connected from top to bottom. According to the invention, any polarization distribution gray-scale pattern generated by a reflective electric addressing liquid crystal light valve is inscribed on the light-operated orientation film layer of the liquid crystal optical panel; the high-damage-threshold liquid crystal optical panel with arbitrary polarization distribution has the characteristics of erasable performance, large aperture, high damage threshold, high compensation precision and the like; and the exposure device of the high-damage-threshold liquid crystal optical panel is simple in structure, easy to expand and low in cost.

The present invention discloses a preparation method of a plane lens. The method comprises: employing high refraction index nanofluid materials to dropwise add onto loose and porous monolithic gel body materials with low refraction index and high damage threshold, and allowing the refraction index of the monolithic gel body materials to be gradually changed (diffusing from middle portion to transverse direction and vertical direction or diffusing from an edge layer) after the nanofluid materials are permeated through diffusion of the nanofluid materials in the monolithic gel body materials and through adoption of the nanofluid material physical property and the monolithic gel body material porous structure to prepare a plane lens. The preparation method of the plane lens is simple in process, and can control forming of the refraction index of the lens through selection of the nanofluid materials and the monolithic gel body materials, the formed lens has higher transmittance than a lens based on glass materials, a lens with a continuously and gradually changed refraction index prepared by the method can omit the tedious preparation process of a traditional glass-based lens and does not need processes such as grinding, polishing and the like so as to save the production cost, and is an ideal lens with a continuously and gradually changed refraction index.

The invention relates to a combined interference chamber for chemical laser device wavelength choice output. A stable chamber structure is adopted in the combined interference chamber which comprisesa recessed surface reflecting mirror, a 45 degree beam splitting sheet and two plane reflecting mirrors. The 45 degree beam splitting sheet and the two plane reflecting mirrors form an interference sub-chamber, and reflecting films having different reflectivity for laser light with different wavelengths are respectively plated on reflecting planes of the recessed surface reflector and the plane reflecting mirrors. Via control over reflectivity parameters of optical elements in a laser resonant cavity, wavelengths of a laser device can be chosen roughly; interference effects are used for closely adjacent wavelengths can be chosen in a careful way via adjustment of parameters such as a length of the interference sub-chamber, a beam splitting ratio of a beam splitting sheet and the like; thelaser device is enabled to output laser light with any single wavelength.

The invention discloses a multi-stage taper optical fiber phase conjugation mirror and a device and method for laser double-journey amplification of the multi-stage taper optical fiber phase conjugation mirror. The device for laser double-journey amplification comprises a laser, a first polarizing film, a lambada / 2 wave plate, a Faraday magnetic rotation device, a second polarizing film, a laser amplifier, a lambada / 4 wave plate, a first lens, a second lens and multi-stage taper optical fibers, wherein the laser, the first polarizing film, the lambada / 2 wave plate, the Faraday magnetic rotation device, the second polarizing film, the laser amplifier, the lambada / 4 wave plate, the first lens, the second lens and the multi-stage taper optical fibers are sequentially placed in the optical axis direction. The first lens is a convex lens, the second lens is a concave lens, a telescope system is formed by the first lens and the second lens, the focal length f1 of the first lens ranges from 100mm to 1000mm, and the focal length f2 of the second lens ranges from -20mm to -1000mm; the distance D1 between the first lens and the second lens satisfies the equation that D1=f1+f2, wherein the D1 ranges from 20mm to 1000mm. The multi-stage taper optical fiber phase conjugation mirror is high in damage threshold, low in stimulated brillouin scattering threshold, high in reflectivity and wide in dynamic working range, therefore, the conjugation mirror is applied to a high-power laser, and damage is avoided.

The invention belongs to the field of spatial light field regulation and control, and relates to a spatial light modulator coupling device without zero-order diffracted light. The device comprises a sealing box, an asymmetric triangular reflector and a spatial light modulator. The asymmetric triangular reflector and the spatial light modulator are oppositely arranged and are arranged in the sealing box; a light inlet hole and a light outlet hole are formed in the sealing box; incident light sequentially passes through the light inlet hole, the asymmetric triangular reflector, the spatial lightmodulator and the asymmetric triangular reflector and then is emitted out from the light outlet hole. The zero-order diffracted light-free spatial light modulator coupling device has the advantages of high-precision light field regulation and control, zero-order light beam suppression without a spatial filter, modularization and compactness of the spatial light field regulation and control deviceand easiness in combination with other systems.

The invention relates to the technical field of laser cutting and discloses a laser through cutting device for a transparent hard and brittle material. The laser through cutting device for the transparent hard and brittle material comprises a laser device, a beam expander, a reflector, an extended depth of focus optical device and a focusing mirror. The laser device receives an external pulse signal and forms a pulse envelope. The pulse envelope is subjected to beam expanding through the beam expander, is reflected by the reflector and then sequentially passes through the extended depth of focus optical device and the focusing mirror to form a laser spot. The focusing spot acts on the machined material to form a material modification channel or a material modification channel cluster penetrating through the material in the thickness direction. The laser through cutting device for the transparent hard and brittle material guarantees that the machined material can crack along a preset path, efficient and precise cutting of the machined material is achieved, and the requirements for high efficiency, high quality and a low damage threshold are met.

A method for enhancing the performance of amorphous silicon thin-film solar cells by femtosecond laser etching. The p-i-n structured amorphous silicon thin-film solar cells are fixed on a femtosecond laser micro-nano processing platform, and femtosecond laser pulses pass through a 10-fold objective lens The microscope system is vertically incident and focused on the surface of the n-type amorphous silicon film of the thin-film solar cell; the linearly polarized femtosecond laser pulse will velvet the surface of the n-type amorphous silicon film of the amorphous silicon thin-film solar cell to obtain an efficient p‑i‑n structure amorphous silicon thin film solar cells. The method has the advantages of simple process, low cost, remarkable improvement in photoelectric conversion performance, and the photoelectric conversion efficiency of the obtained solar cell reaches 14.9%, which is twice the conversion efficiency of the untreated amorphous silicon thin film solar cell.

The invention discloses a laser path system of a semiconductor pumping laser cleaning machine and relates to the technical field of laser cleaning. Double pumping light sources are adopted for carrying out pumping motivation on laser crystals, after first harmonic waves are formed, ultraviolet laser beams are generated through intra-cavity second harmonic generation conversion and third harmonic generation conversion to be output, and the ultraviolet laser beams have the advantages of being high in electro-optical conversion efficiency, high in repetition frequency, small in pulse width, low in damage threshold and the like. The repetition frequency of a laser device with the laser path system can reach 20-100 KHz, and at the repetition frequency of 100 KHz, the average output power of 355nm lasers can reach 10 W; through an acousto-optical Q-regulated switch, the laser output pulse width can reach 40 ns, the beam quality factor M<2> is smaller than 1.2, and the laser remote divergence angle can be controlled at 1 mrad; the laser path system can be used for high-precision laser lossless cleaning, and is good in cleaning effect and suitable for large-area laser cleaning.

The invention relates to an arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel and a preparation method thereof. The arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel comprises a first dielectric film layer, a first glass substrate, a first chemical film layer, an optical orientation film layer, a liquid crystal layer, a friction orientation film layer, a second chemical film layer, a second glass substrate, a second dielectric film layer and an interval sub frame. According to the panel, arbitrary amplitude shaping binarycoding figure is generated by a silicon substrate photo-etching system which comprises an LED (light-emitting diode) blue light source, an array lens, a collimator, a polarization beam splitter, a silicon substrate liquid crystal space light modulator, an achromatic imaging system and a computer, and the figure is inscribed on the optical orientation film layer of the liquid crystal binary opticalpanel to obtain the arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel. The arbitrary amplitude shaping high damage threshold liquid crystal binary optical panel has the advantages that the panel is rewritable, high in damage threshold and shaping accuracy and the like.