6 results about "Yttrium lithium fluoride" patented technology

The utility model relates to a single crystal furnace for growing neodymium-doped yttrium lithium fluoride, and belongs to the technical field of preparation of yttrium lithium fluoride crystals. The single crystal furnace for growing neodymium-doped yttrium lithium fluoride comprises a furnace body, a crucible arranged in the furnace body and a temperature adjusting system used for heating the crucible, the crucible is used for containing raw materials of neodymium-doped yttrium lithium fluoride, and a pulling system used for pulling the neodymium-doped yttrium lithium fluoride is arranged at the top of the furnace body. A liquid cooling system is arranged on the side wall of the furnace body, and an anti-fluorine coating is arranged on the surface of a hearth of the furnace body. In the growth process of yttrium lithium fluoride crystals, epoxy resin, polytetrafluoroethylene and other materials are adopted, and the fluorine-proof coating is arranged in the hearth of the single crystal furnace, so that the hearth and a liquid cooling system are prevented from being eroded by fluorine-containing protective gas, and the condition that neodymium-doped yttrium lithium fluoride raw materials and thermal insulation materials are polluted due to liquid leakage of the hearth is prevented.

The invention discloses a doped yttrium lithium fluoride crystal and a preparation method thereof, and belongs to the technical field of crystal preparation, and the preparation method comprises the following steps: S1, weighing L F, YF3, ErF3, YbF3 and modified polytetrafluoroethylene, mixing, and carrying out ball milling to obtain raw material powder; s2, the raw material powder is placed in a tubular resistance furnace, air is exhausted through high-purity nitrogen, the temperature is 750-815 DEG C, HF gas is introduced, a reaction is conducted for 1-5 h, and crystal powder is obtained; s3, the crystal powder is placed in a grinder to be ground into powder, then the powder is placed in a platinum crucible to be compacted, the crucible is sealed, the sealed platinum crucible is placed in a crucible descent crystal growth furnace, the crystal is grown through a crucible descent method, and the doped yttrium lithium fluoride crystal is obtained.The obtained doped yttrium lithium fluoride crystal is higher in 2.7-micron fluorescence intensity, suitable for laser devices and capable of being used for laser devices. And high-efficiency mid-infrared light laser of 2.7 microns is output.

The present invention relates to the technical field of yttrium lithium fluoride crystal bonding, and specifically relates to a yttrium lithium fluoride composite crystal and a preparation method thereof. The preparation method includes the following steps: S1, polishing the bonding surfaces of a yttrium lithium fluoride crystal with a c-axis crystal orientation and a doped yttrium lithium fluoride crystal with an a-axis crystal orientation; S2, performing immersion treatment with different organic solutions after polishing; S3, obtaining a first intermediate product through a direct bonding technique; S4, subjecting the first intermediate product to a pressure treatment to obtain a second intermediate product; S5, subjecting the second intermediate product to hot isostatic pressing and annealing treatments to obtain a yttrium lithium fluoride composite crystal. The yttrium lithium fluoride composite crystal prepared by the present invention is polished with different polishing liquids and subjected to immersion treatment, which improves the van der Waals force between the two laser crystals, strengthens the strength of the bonding surface of the bonded crystals, and improves the yield rate.

The application relates to a large-size yttrium lithium fluoride single crystal growth system and process, and belongs to the technical field of artificial crystal growth. The system comprises a furnace body, a crucible, a temperature field subsystem, a vacuum subsystem, a mechanical transmission subsystem, an automatic growth control subsystem and a main control subsystem. The single crystal growth system provided by the application is cooperatively operated by the temperature field subsystem, the vacuum subsystem, the mechanical transmission subsystem and the automatic growth control subsystem under the unified coordination of the main control subsystem, so as to jointly create a crystal growth environment which can be accurately controlled and is stable and reliable. Through a pretreatment process comprising raw material pre-melting, cleaning and weighing and supplementing of raw materials, and in combination with the variable-speed rotation technology of the crucible in the growth process, the purity and the component uniformity of the melt are significantly improved.

A 1.9 [mu] m quadruplicated-frequency blue-light solid-state laser belongs to the technical field of lasers, 1.9 [mu] m fundamental-frequency laser output is obtained by using an LD pumping thulium-doped yttrium lithium fluoride crystal and a thulium-doped yttrium aluminate crystal, and the central wavelength of output fundamental-frequency light can be tuned to 1944 nm by adjusting the inclination angle of an etalon in a cavity. After solid amplification of the thulium-doped yttrium aluminate crystal, high-power 1944nm fundamental frequency laser output is obtained, and after cascade frequency doubling of the nonlinear crystal, 486nm laser output is obtained. 1.9 [mu] m stable laser output is realized by adopting a positive thermal lens and negative thermal lens gain crystal mutual thermal compensation technology, high-energy and high-repetition-frequency blue light pulse laser is obtained through secondary frequency doubling, and the laser has the characteristics of no need of additional compensation thermal effect and good quality of output laser beams; the method is especially suitable for the fields of ocean radar detection, underwater communication and the like.

The application discloses a 1.9 mu m four times frequency blue light solid laser, belongs to the technical field of lasers, and utilizes LD pumped thulium doped yttrium lithium fluoride crystal and thulium doped yttrium aluminum fluoride crystal to obtain 1.9 mu m fundamental frequency laser output; the center wavelength of the output fundamental frequency light can be tuned to 1944 nm by adjusting the tilt angle of an intracavity etalon; high-power 1944 nm fundamental frequency laser output is obtained after thulium doped yttrium aluminum fluoride crystal solid amplification; and 486 nm laser output is obtained after cascade frequency doubling of a nonlinear crystal. The application realizes stable 1.9 mu m laser output by adopting mutual thermal compensation technology of positive thermal lens and negative thermal lens gain crystal, and then obtains large-energy and high-repetition-frequency blue light pulse laser by twice frequency doubling, and has the characteristics of no additional compensation of thermal effect and good output laser beam quality, and is especially suitable for application in the fields of ocean radar detection and underwater communication.