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DAST crystal based terahertz generation and recording of time resolved photoacoustic spectra of N2O gas at 0.5 and 1.5 THz bands

机译:基于Dast Crystal的Terahertz生成和记录时间分辨的N2O气体光声光谱在0.5和1.5 THz频段

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We report the THz generation using optical rectification process in an indigenously grown organic salt 4-N, N-dimethylamino-4'-N'-methyl-stilbazoliumtoyslate (DAST). A 60 fs, 1 kHz optical parametric amplifier, tunable between 0.8 and 1.6 mm range was employed to generate THz radiation. It is observed that the THz signal is accompanied with weak second harmonic signal of pump wavelength. The conversion efficiency (eta) of generated THz is 0.0161%. The radiation generated from DAST crystal is only THz signal, which is confirmed theoretically by choosing the crystal thickness is equivalent to be its optimum coherence length. In addition, we have selected two rotational lines i.e. J = 19, 58 of pure N2O gas by using 0.5 and 1.5 THz band pass filters for recording the time resolved photoacoustic (PA) spectra at 1 atm pressure for the first time. (C) 2016 Elsevier B.V. All rights reserved.
机译:我们在本发明生长的有机盐4-N,N-二甲基氨基-4'-N'-甲基 - 斯基唑鎓氧化物(DAST)中使用光学整流过程来报告THZ生成。 使用60 fs,1 kHz光学参数放大器,可在0.8和1.6mm范围之间进行可调谐,以产生辐射。 观察到THz信号伴随着泵波长的弱二次谐波信号。 生成的THz的转化效率(ETA)为0.0161%。 由达斯晶体产生的辐射仅是THz信号,理论上通过选择晶体厚度等同于其最佳相干长度。 另外,通过使用0.5和1.5 ZHz带通滤波器,选择了两个旋转线I.e.J = 19,58纯N2O气体,首次将时间分辨的光声(PA)光谱在1个ATM压力下记录。 (c)2016年Elsevier B.v.保留所有权利。

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