Abstract
An innovative infrared nonlinear optical crystalCsGeBr3 was synthesized. Abinitio calculations on CsGeBr3 were also carried out in order to analyse the second-order nonlinear susceptibilities. From itspowder x-ray diffraction pattern, this crystal was characterized as a rhombohedral structure with an(R3m, No 160) space group symmetry. The reflection powder second-harmonicgeneration (PSHG) measurement of CGBr showed that its nonlinearoptical efficiency is 1.62 times larger than that of rhombohedralCsGeCl3 and is 9.63 timeslarger than that of KH2PO4 (KDP), and most important of all thatCsGeBr3 is phase-matchable.The rescaled deff(2) of CGBr was about 2.45 times larger than that of rhombohedralCsGeCl3, and thistrend was coincident with the ab initio calculation results. The infrared transparent spectrum of rhombohedralCsGeBr3 was extended tomore than 22.5 µm. Therhombohedral CsGeBr3 shows the potential in the realm of nonlinear optics and can be applied to the infraredregion.
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