3 results about "Yttrium lithium fluoride" patented technology

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.

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.