Deep ultraviolet non-linear optical crystal of barium borate hydrate, preparation method therefor and use thereof

摘要

Provided area deep ultraviolet non-linear optical crystal of barium borate hydrate, a preparation method therefor and the use thereof. The chemical formula of the crystal is Ba₂B₁₁O₂₂H₇, belonging to monoclinic system, with the space group thereof being P2₁, the crystal cell parameters thereof being a=6.7719(10) Å, b=21.1195(4) Å, c=6.8274(10) Å, β=119.3950(10) °, and the molecular weight thereof being 752.65. The non-linear optical crystal of borate is obtained by means of programmed cooling or natural cooling using a hydrothermal method. The crystal powder has a frequency-doubled effect of about 2 times that of KDP (KH₂PO₄) and an ultraviolet cut-off edge of below 175 nm and can be used as a deep ultraviolet non-linear optical crystal. The growth process of the crystal has advantages such as simple, a low cost, a low toxicity, a short growth cycle, stable physical and chemical properties, etc. The deep ultraviolet non-linear optical crystal of barium borate hydrate Ba₂B₁₁O₂₂H₇ is widely used in the preparation of non-linear optical devices such as frequency doubling generators, upper frequency converters, lower frequency converters, optical parametric oscillators etc.