K3YB6O12 compound, K3YB6O12 nonlinear optical crystal and preparation methods and applications thereof

Abstract

The invention relates to a K3YB6O12 compound, a K3YB6O12 single crystal and preparation methods and applications of the K3YB6O12 compound and the K3YB6O12 single crystal. The K3YB6O12 compound is prepared by chemical synthesis, and the K3YB6O12 single crystal grows by melting salt with a fluxing agent, wherein the fluxing agent is a K2O-B2O3-KBF4 fluxing agent. The K3YB6O12 single crystal has no center of symmetry, belongs to a trigonal system and has an R32 space group, and the cell parameters comprise a=13.2202(19)Angstrom, c=30.281(6)Angstrom, v=4583.3(13)Angstrom<3>, and Z=15. The K3YB6O12 single crystal can be used for preparing a nonlinear optical element, has high purity, low cost, strong nonlinear optical effect, good mechanical performance and wide transmission range, is not easy to be doped with impurities, is non-deliquescent, is easy to process and preserve and has an ultraviolet interception edge of 195nm.

Description

technical field [0001] The invention belongs to the field of compounds, crystals and preparation and application, in particular to a kind of K 3 YB 6 o 12 Compound, K 3 YB 6 o 12 Nonlinear optical crystals and their preparation methods and uses. technical background [0002] Crystals with nonlinear optical effects are called nonlinear optical crystals. Here nonlinear optical crystal effects refer to effects such as frequency doubling, sum frequency, difference frequency, and parametric amplification. Using the nonlinear optical effect of crystals, nonlinear optical devices such as second harmonic generators, up and down frequency converters, and optical parametric oscillators can be made. The laser generated by the laser can be frequency converted by nonlinear optical devices, so as to obtain more useful wavelengths of laser light, so that the laser can be used more widely. The all-solid-state blue-green laser system can be realized by generating near-infrared laser ...

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Problems solved by technology

However, the effective frequency doubling wavelengths of these three crystals are limited in the ultraviolet spectral region.

For BBO it is due to (1)(B 3 o 6 ) group has a large conjugated π orbital characteristic, which redshifts the band gap of the group, which leads to the absorption edge of the BBO crystal at 189nm; (2) limited by the ultraviolet absorption edge, the crystal cannot produce a Harmonic light; (3) planar (B 3 o 6 ) group leads to the birefringence Δn≈0.12 of the BBO crystal, and the large birefringence makes the acceptance angle Δθ=0.45mra of the BBO crystal at the quadrupling frequency, which is too small for practical devices

For LBO, because the birefringence is too small, phase matching cannot be achieved in a shorter wavelength band, so effective frequency multiplication output cannot be generated.

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