Yoshii Kazumichi, Miyaji Godai, Miyazaki Kenzo
Advanced Laser Science Research Section, Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan.
Opt Lett. 2009 Jun 1;34(11):1651-3. doi: 10.1364/ol.34.001651.
We apply high-order harmonic generation to sensitive measurements of the molecular rotational temperature in a thin supersonic gas beam. The method uses nonresonant pump and probe femtosecond laser pulses to generate harmonic radiation from coherently rotating molecules. The rotational temperature of molecules can be derived accurately with high spatial and temporal resolutions from the Fourier spectrum of time-dependent signals. The validity of this method was tested for an expanding flow of an N(2) beam with a rapid temperature decrease. The results show the versatile applicability of this method.
我们将高次谐波产生技术应用于对薄超声速气体束中分子转动温度的灵敏测量。该方法使用非共振泵浦和探测飞秒激光脉冲，从相干旋转的分子中产生谐波辐射。分子的转动温度可以从随时间变化信号的傅里叶频谱中，以高空间和时间分辨率精确推导得出。针对快速降温的N₂束膨胀流，对该方法的有效性进行了测试。结果表明了该方法具有广泛的适用性。
