Characterization of Nonlinear Optical Properties of Crystal RbGeCl3$\cdot$$x$(H2O) in Infrared Region

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概要

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• The nonlinear optical (NLO) property of hydrated rubidium germanium chloride (HRGC), RbGeCl3$\cdot$$x$(H2O), is identified. Infrared absorption data support structural evidence that HRGC contain co-ordinated water molecules with strong hydrogen bond. The infrared spectrum indicated HRGC is transparent in most of the infrared region with only little influnce from water. Calculations based on density functional theory shows that the band gap of the RbGeCl3 (RGC) crystal is at least 3.84 eV, which is larger than that of the infrared (IR) NLO crystal CsGeCl3. Single crystals of HRGC, sized up to $3 \times 2 \times 1$ cm3, were grown in aqueous solution by a slow dehydrate technique. The synthetic, structural, and optical properties of an off-centrosymmetric IR nonlinear optical (NLO) RbGeCl3$\cdot$$x$(H2O) crystal were investigated experimentally. Powder second harmonic generation (PSHG) measurement indicates that the crystal structure of HRGC becomes off-centrosymmetric. Precise X-ray diffraction measurements showed that [100] family diffraction peaks split slightly. Unlike the RGC crystal structure whose space group is $P2_{1}\bar{m}$, the HRGC crystal loses the inversion symmetry. Comparisons with known NLO material KH2PO4 (KDP), indicate that HRGC’s NLO susceptibility, $\chi^{(2)}$, is about one third of that for KDP. The absorption edge of HRGC occured at 310 nm (${\approx}4.0$ eV), which indicates NLO HRGC crystal can have larger laser damage threshold. According to the Fourier transform infrared (FTIR) measurement, HRGC has a transparent region from 0.31 to 30 μm, thus it can be applied to wider optical spectrum from ultraviolet, visible, to mid-IR.

• 2009-08-25

著者

• Chang Yia-Chung

  Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.

• Tang Li-Chuan

  Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.

• CHANG Chen-Shiung

  Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University

• Liu Li-Qiang

  College of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China

• Yao Jui-hsien

  Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.

• Huang Jung-Yau

  Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.

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