BaHgSe2 NONLINEAR OPTICAL CRYSTAL, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF

摘要

A BaHgSe2 nonlinear optical crystal has no symmetric center, belongs to the orthorhombic crystal system, and has a space group of Pmc21. The crystal cell parameters of the BaHgSe2 nonlinear optical crystal are: a=4.36 Å, b=14.88 Å, c=7.59 Å, α=β=γ=90°, and Z=4. The preparation method uses the high-temperature melt spontaneous crystallization method or the Bridgman-Stockbarge method for growth. In the growth of the BaHgSe2 nonlinear optical crystal, the crystal has the advantages of relatively fast growth speed, low cost, easy to obtain a crystal having a relatively large size, and the like. The obtained BaHgSe2 nonlinear optical crystal has the advantages of large nonlinear optical effect, wide euphotic waveband, high hardness, good mechanical properties, easy to be processed, and the like. The BaHgSe2 nonlinear optical crystal can be used for preparing a nonlinear optical element. The element comprises an apparatus for generating, after an incoming electromagnetic radiation passes through at least one of the BaHgSe2 nonlinear optical crystals, an output radiation whose frequency is different from the incoming electromagnetic radiation.