37results about How to "High photodamage threshold" patented technology

The invention relates to a saturable absorber for a fiber laser and a preparation method thereof. The saturable absorber is a transmission-type tapered saturable absorber, comprising a core (101), a cladding (102), Coating layer (103) and heterojunction layer. Layered graphene and Bi obtained by exfoliating the liquid phase 2 Te 3 The solution can be obtained by attaching to the tapered region of the tapered single-mode fiber by light adsorption. Compared with the prior art, the invention has the advantages of high damage threshold, simple structure, bidirectional transmission fiber laser capable of carrying high power, and the like.

The invention relates to a three-dimensional measurement method for high-power laser body damage of a KDP (Potassium Dihydrogen Phosphate) crystal. The method substantially comprises the following steps of placing the KDP crystal to be measured into a detection optical path of a digital hologram interferometric device, and detecting a phase distribution outline of body damage in the crystal, i.e.a two-dimensional phase distribution image; carrying out angle scanning on the crystal to be measured, carrying out Fourier transform on the two-dimensional phase distribution image obtained from each angle sampling point, and constructing a three-dimensional phase distribution appearance of the body damage through the Fourier transform. The three-dimensional fine structure of the body damage canbe utilized as an important parameter for qualitatively describing laser damage characteristics, and become a key environment correlated with laser damage macroscopic characteristics and micromechanisms and has important application to exploration of a KDP / DKDP (Deuterated Potassium Dihydrogen Phosphate) crystal laser damage mechanism and improvement of a laser damage threshold.

The invention relates to a vector light field converter and a polarized light converting method. The vector light field converter is formed by an optical crystal device and / or a wave plate, wherein the crystal length of the optical crystal device is in spiral change, thus a polarization direction passing through the optical crystal can be subjected to rotation, the radial polarized light output can be obtained, the conversion from the radial polarization to the angular polarization can be realized when a half of the wave plate is placed at the back part of the optical crystal device, and the angular polarized light output can be obtained. The vector light field converter disclosed by the invention has the advantages that the cost is low, the converting efficiency is high, the light damage threshold is high, and the like. The vector light field converter and the polarized light converting method, disclosed by the invention, have important application prospect in optics respects such as quantum optical communication, cold atom trapping, dynamic optical storage, quantum computing and material processing.

The present invention proposes a method for preparing a KTP nonlinear racetrack microring resonator, including six steps of KTP wafer processing, ion implantation, electron beam exposure, follow-up processing, ion etching processing and final processing, through one process of ion implantation, Just realized the preparation of the thin-film waveguide structure similar to the on-chip lithium niobate thin-film material, the production process is greatly simplified, the time is shortened, and the cost is significantly reduced. At the same time, the KTP nonlinear microring resonator finally prepared by the present invention is compatible with existing Compared with Lithium Oxide nonlinear microring resonators, it has a higher optical damage threshold, which can increase the output power of nonlinear frequency conversion light from microwatts to milliwatts, and is suitable for both input and output optical signals. In the case of pulsed laser, ion implantation, electron beam exposure, metal evaporation deposition coating, and reactive ion etching are all relatively mature micro-nano processing technologies, making the present invention have good operability and repeatability.

The invention discloses a novel cone lens for generating Bottle beams with the periodicity, which consists of an axis pyramid and a frustum structure glued at the bottom of the axis pyramid; the lower bottom surface of the frustum structure is glued with the bottom surface of the axis pyramid; and the radius of the lower bottom surface of the frustum structure is larger than that of the upper bottom surface of the frustum structure. The novel cone lens can obtain a plurality of Bottle beams with the recurrence periodicity through a single component and adjust the dimension and the recurrence periods of the plurality of generated Bottle beams through controlling a bottom angle of the frustum structure and the radius of the upper bottom. Compared with the conventional method for generating the bottle beams, the novel cone lens has the advantages of simple structure, high conversion efficiency and high light damage threshold value, and the component is simple to process. The novel cone lens provides a brief and effective new approach for obtaining the Bottle beams and has the special significance for the multi-layer operation and control of particles.

The invention discloses a terbium-containing borate compound. The chemical formula of the terbium-containing borate compound is Rb2LiTbB2O6. The invention also discloses a polycrystalline compound ofthe terbium-containing borate compound, an optical crystal, and a preparation method and application of the optical crystal. The polycrystalline compound can be used as a fluorescent powder matrix, and the optical crystal can be used as a magneto-optical crystal. The terbium-containing borate compound is simple in synthesis and low in cost, grows easily, and has important economic value and scientific research value in the field of solid-state illumination and magneto-optical materials.

The invention relates to an optical lens and provides a lens capable of directly producing an annular hollow focus beam. The lens capable of directly producing an annular hollow focus beam comprises a convex lens having a beam input surface and a beam output surface. A concave cavity is provided at the center of the beam output surface of the convex lens. The depth of the concave cavity is much smaller than the thickness of the central axis part of the convex lens, the aperture of the concave cavity is much smaller than the diameter of the convex lens, and the curvature of the surface of the concave cavity is much larger than that of the beam input surface of the convex lens. An annular hollow focus beam can be obtained by focusing a parallelly-incident Gaussian beam and a focus spot can reach the micron level, so the very high power density and light conversion efficiency are achieved. In addition, the number of optical components is reduced, the practical application cost of the annular hollow focus beam is significantly reduced and the difficulty in system installation and debugging is effectively decreased, so the lens of the invention is applicable in various general occasions.

The invention discloses a novel axicon capable of generating multiple Bottle beams. The axicon is characterized in that on the basis of a traditional axicon, a part adjacent to the top end is of a spherical structure. According to the novel axicon, multiple Bottle beams can be generated by virtue of a single component; the novel axicon has the advantages of simple component structure, high conversion efficiency, high light loss threshold and energy concentration; the generated multiple Bottle beams are concentrated in energy, so that the particle confinement degree can be improved; a concise and effective new way is provided for acquiring multiple Bottle beams; and the novel axicon has guidance significance to particle control such as particle confinement.

The invention relates to an optical parametric oscillation laser based on wide-band-gap semiconductor silicon carbide crystals. The optical parametric oscillation laser sequentially comprises an excitation source, an input mirror, the semiconductor SiC crystals and an output mirror. The semiconductor SiC crystals are cut in the phase position matching direction of optical parametric oscillation of the semiconductor SiC crystals, medium membranes which allow much excitation light, much signal frequency light and much idler frequency light to penetrate through are plated on light-permeable faces respectively, the excitation source is an all-solid-state pulsed laser, medium membranes which allow much excitation light to penetrate through and allow much frequency light and much idler frequency light to be reflected are plated on the two light-permeable faces of the input mirror respectively, and a medium membrane which allows much frequency light to be reflected and allows idler frequency light to partially penetrate through is plated on the input mirror. The wide-band-gap semiconductor silicon carbide crystals are used as a non-linear optical medium, therefore, the optical parametric oscillation laser ranging from 1.28 micrometers to 6 micrometers are output, the output energy is high, the structure is simple, and the penetrating range is continuous and adjustable.

The present invention relates to artificial crystal, and is especially one kind of self-frequency doubling laser crystal material Yb3+:Gd1-xYxCa4O(BO3)3 and its preparation process. The crystal belongs to the moniclinic system, has space group Cm; has the crystal cell parameter of a=8.080 angstrom, b=16.014 angstrom, c=3.539 angstrom, beta=101.18 deg, and V=449.0 cubic angstrom; and refractive index of 1.69. The monocrystal is grown in Czochralski process at the grown temperature of 1481-1550 deg.c, pulling rate of 0.5-3 mm / hr, crystal rotation speed of 15-40 rpm. The monocrystal has high quality and large size.