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

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 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 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 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.