Abstract
High-quality crystals of BaGa4Se7, a newly developed IR nonlinear optical (NLO) material, were obtained via the Bridgman–Stockbarger technique. The FWHM of the (002) peak rocking curve is about 0.008° and the transmittance through a polished 2mm thick (001) plate is around 65% over the wide range of 1–14μm. Various thermophysical properties were measured on crystals. The thermal expansion behavior in BaGa4Se7 does not exhibit strong anisotropy with αa=9.24×10−6K−1, αb=10.76×10−6K−1, and αc=11.70×10−6K−1 along the three crystallographic axes. The thermal diffusivity/thermal conductivity coefficients measured at 298K are 0.50(2)mm2s−1/0.74(3)Wm−1K−1, 0.42(3)mm2s−1/0.64(4)Wm−1K−1, 0.38(2)mm2s−1/0.56(4)Wm−1K−1, along the a, b, c crystallographic axis respectively. In addition, the surface laser damage threshold was measured to be 557MW/cm2 using a Nd:YAG (1.064μm) laser under conditions of 5ns pulse width, 1Hz frequency, and D=0.4mm spot size.
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