Beryllium fluoroborate non linear optical crystal and its growing method and use

Abstract

This invention relates to a kind of glucinium borofluoride non-linear optic crystal. The molecular formula is MBe2BO3F2,M=Rb or Cs. Applying fused salt growth preparation process: first mix glucinium borofluoride with flux in proportion, to rise temperature to 750-800DEG C, then cool down to 2-10DEG C over saturation temperature; Add seed crystalline in above mentioned high temperature solution, rotate the seed crystalline style, cool down to saturation temperature and then cool it slowly; lift out the crystal from solution and cool down to room temperature to gain the output. The feature of this invention: nonlinear optical effect; wide lucency wave band, ultraviolet cut-off edge reach 150nm, no deliquescence, not dissoluble to dilute hydrochloric acid and nitric acid, good chemical stability, fit for ultraviolet wave band laser frequency conversion need, can be used for making nonlinear optics, can implement N days: double, triple, quadruple, or quintuple frequency multiplication YAG laser output or even lower than 200nm.

Description

technical field [0001] The present invention relates to a kind of optoelectronic functional material and its growth method and application, especially to a kind of nonlinear optical material and its preparation method and application, specifically, to a kind of beryllium fluoroborate (MBe 2 BO 3 f 2 , referred to as MBBF, M=Rb, Cs) nonlinear optical crystal and its growth method and application. When M=Rb, the beryllium fluoroborate salt is rubidium beryllium fluoroborate, and the chemical formula is RbBe 2 BO 3 f 2 , referred to as RBBF; when M=Cs, the beryllium fluoroborate salt is cesium fluoroborate, and the chemical formula is CsBe 2 BO 3 f 2 , CBBF for short. Background technique [0002] The nonlinear optical effect of crystal refers to such an effect: when a laser beam with a certain polarization direction and a certain incident direction passes through a nonlinear optical crystal (such as MBBF), the frequency of the laser beam will change. Figures 1 and 2 a...

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Problems solved by technology

However, the effective frequency-doubling output 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 red-shifts 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 Harmonic light; (3) planar (B 3 o 6 ) group causes the birefringence Δn≈0.12 of the BBO crystal, and the large birefringence makes the acceptance angle Δθ=0.45mra day of the BBO crystal at the quadruple 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-doubling optical output cannot be produced.

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