4 results about "Yttrium orthovanadate" patented technology

The invention discloses a shouldering method for growing yttrium vanadate crystals by a pulling method, a pulling method growth process of large-size crystals and the yttrium vanadate crystals, the shouldering method deconstructs the growth process into four stages, and quantitative interval control is performed on key parameters of each stage. Necking process parameters are standardized and coordinated with gradual adjustment of the included angle theta, so that stress slow release and defect screening in the early growth stage are realized; furthermore, the seed crystal immersion depth h is dynamically and finely adjusted, so that closed-loop control on the solid-liquid interface form is formed, and the ideal micro-convex state is maintained. According to the process, the undoped yttrium vanadate single crystal with the diameter not smaller than 80mm can be stably prepared, the 1064nm wavelength absorption coefficient of the undoped yttrium vanadate single crystal is lower than 0.005 cm <-5 >, the optical uniformity of the undoped yttrium vanadate single crystal is superior to 10 <-5 >, no macroscopic defect exists in the undoped yttrium vanadate single crystal, and the problems that large-size crystals are prone to cracking, multiple in defect and poor in consistency in the growth process are effectively solved.

The utility model discloses a high-power optical isolator, which comprises a magnetic ring, a first diffraction lens, a second diffraction lens, a first wedge-shaped birefringent crystal, a second wedge-shaped birefringent crystal and a dynamic adjustable wedge-shaped angle, accurate matching and regulation of incident light with different wavelengths and powers can be achieved, the bearing capacity of the optical isolator for high-power laser is improved, all optical elements are fixed through optical cement, the problem that traditional organic cement loses efficacy due to the influence of high temperature and strong light is avoided, the stability of the optical isolator is ensured, and the service life of the optical isolator is prolonged. The dynamic adjustable wedge-shaped angle is finely adjusted through piezoelectric ceramics, the precision and stability of the optical isolator are improved, the surfaces of the first diffraction lens and the second diffraction lens are plated with aluminum nitride heat conduction layers, and micron-sized cooling flow channels are embedded, so that the temperature of an optical element is effectively reduced, and performance reduction or damage caused by overheating is prevented; and the service life of the optical isolator is prolonged.

The invention belongs to the technical field of crystal material precision machining, and particularly relates to an edge breakage prevention method for a multi-wire cutting crystal material, which comprises the steps of preparing a crystal to be cut, selecting a protective material, fixing the protective material, carrying out multi-wire cutting operation and carrying out subsequent treatment. The protective material is tightly attached to the to-be-cut surface of the crystal in a vacuum or electrostatic adsorption mode and is matched with mainstream multi-wire cutting equipment, cutting parameters are accurately controlled, and the protective material is cleaned and reused after cutting. Stress buffering is achieved through the moderate elasticity of the acrylic glass, visualization of the cutting process is guaranteed through high light transmittance, the material cost is low, repeated use is achieved, and equipment does not need to be transformed. By applying the method, the edge breakage rate of brittle crystals such as yttrium vanadate can be reduced to 1% or below, the yield is increased to 99% or above, the comprehensive processing cost is reduced by 60% or above, and the method is suitable for high-end processing scenes such as laser crystals and semiconductor substrates and has wide popularization value.

A high-power collimated optical adapter with isolation receiver reflection is disclosed, relating to the field of optical isolation adapter technology. The technical solution includes a housing with an optical fiber insertion slot at one end and an isolator mounting slot at the other end. A lens mounting slot is located at the end of the isolator mounting slot facing the optical fiber insertion slot, and the optical fiber insertion slot, lens mounting slot, and isolator mounting slot are interconnected. A magnetic ring is disposed within the isolator mounting slot, and two optical isolators are sequentially arranged axially within the magnetic ring's inner cavity. Each optical isolator includes a Faraday rotator with air-coated surfaces on both sides, and wedge plates respectively disposed on both sides of the Faraday rotator. The wedge plates are made of yttrium vanadate crystal. A collimating lens is disposed within the lens mounting slot. This invention achieves an isolation level of over 50dB, reduces insertion loss to below 0.3dB, can transmit light of any polarization state, and can be used in high-power scenarios up to 2W.