Fluoroberyllium borate non-linear optical crystals and their growth and applications

Abstract

A beryllium borate fluoride salt nonlinear optical crystal is represented by molecule formula Mbe2BO3F2, wherein M is Rb or Cs. The crystal is grown by melt salt method, comprising the following step, mixing beryllium borate fluoride salt with flux at appropriate ratio, rising to 750-800° C., and keeping at constant temperature, then cooling to 2-10° C. higher than saturated temperature to obtain a elevated solution; putting seed crystal on seed crystal pole into the elevated solution, rotating the seed crystal pole, cooling to saturated temperature, and then cooling slowly; raising the obtained crystal above liquid level and cooling to room temperature, then obtaining the present nonlinear optical crystal. The crystal has nonlinear optical effect, broad transmittance wave, adsorption edge of ultraviolet lower to 150 nm, doesn't deliquesce, isn't soluble to diluted hydrochloric acid and nitric acid, and has good chemical resistance. The present crystal satisfies ultraviolet laser frequency-conversion requirements, can be used to make nonlinear optical device, make the second, the third, the forth, the fifth, or the sixth harmonic output device of Nd:YAG realized, and also can be used to harmonic output devices of other laser, to output tunable coherent light equal or down to 266 nm.

Dependencies are inferred from the claim text.