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Rb2CdBr2I2: A New IR Nonlinear Optical Material with a Large Laser Damage Threshold

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journal contribution
posted on 16.04.2014, 00:00 authored by Qi Wu, Xianggao Meng, Cheng Zhong, Xingguo Chen, Jingui Qin
This paper describes the synthesis, crystal structure, and photophysical properties of a new compound Rb2CdBr2I2. It crystallizes in the noncentrosymmetric space group Ama2. In the crystal, all the distorted tetrahedron [CdBr2I2]2– groups are arranged in a way such that all the Cd–I bonds are located in the same side of the Cd atoms resulting in a net polarization. Rb2CdBr2I2 showed a powder second harmonic generation (SHG) response 4 times that of KH2PO4 (KDP). The preliminary measurement indicated that it exhibits a large laser-induced damage threshold (LDT) of 190 MW/cm2 which is 6 times that of AgGaS2. It also exhibits a wide transparent region (0.37–14 μm) with a relatively high (up to 490 °C) thermal stability. All these indicate that Rb2CdBr2I2 is a new promising candidate for NLO materials in the IR region.