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AssigneeTianjin University of Technology
InventorsHongwei Yu, Zhen Qian, Hongping Wu, Zhanggui Hu
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The present invention relates to an orthogonal-phase compound and its nonlinear optical (NLO) crystal of BaGa7Se7, its producing method and uses thereof. Polycrystalline orthogonal-phase BaGa4Se7 was prepared by a high-temperature solid-phase reaction in a sealed silica tube. Large size single crystals of orthogonal-phase BaGa4Se7 could be prepared by the flux method or Bridgman method. BaGa4Se7 crystallizes in the point group mm2. Orthogonal-phase BaGa4Se7 has a powder second harmonic generation (SHG) efficiency of about 5 times that of AgGaS2 and is phase-matchable. The orthogonal-phase BaGa4Se7 is non-hygroscopic and has good mechanical properties, which makes it easy to cut, polish, and coat by normal processing. The orthogonal-phase BaGa4Se7 crystal has never been cracked during cutting and polishing. The orthogonal-phase compound and NLO crystal of BaGa4Se7 can be used as NLO devices.
The compound has a chemical formula of BaGa4Se7. It belongs to orthorhombic crystal system, point group mm2, with unit-cell parameters a=15.438(12) Å, b=7.610(6) Å, c=10.521(7) Å, Z=2 and V=1236.23(16) Å3 and a molecular weight of 968.94.
A nonlinear optical crystal (NLO) crystal has a chemical formula of BaGa4Se7 with a molecular weight of 968.94. It belongs to orthorhombic crystal system, point group mm2, i.e. β-BaGa4Se7, with unit-cell parameters a=15.438(12) Å, b=7.610(6) Å, c=10.521(7) A, Z=2 and V=1236.23(16) Å. β-BaGa4Se7 has a powder SHG efficiency of about 5 times that of AGS and is phase-matchable. The as-grown crystal is transparent in the wavelength range of 0.44-25 μm.
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