Studies on New Spectrometric Light Source -Rainbow Stars-

为了获得宽调谐的激光发射，将双色激光束引入到加压氢气中，产生双色受激拉曼辐射。激光波长可在247 ~ 771 nm范围内变化。然而，在技术上难以同时扫描两种激光波长。然后，通过引入圆偏振单色激光束，首先产生少量的旋转受激拉曼谱线。随后，通过双色受激拉曼效应，偏振态变为线性，并产生了许多转动和振动谱线。这种技术允许波长扫描，并可用于分析光谱学。通过优化光束的偏振，也可以选择性地产生振动或旋转谱线。氢气压力和束流聚焦条件。或者。旋转线的间距可以从587 cm ↑ [2]改变到354 cm ↑ [3]<-1>， ...更多信息 - 氢与仲氢。利用双色受激拉曼辐射可以产生等间距的多频激光辐射。由测不准原理可知，利用宽频率成分的激光器可以产生超短光脉冲。该方法有望在超短脉冲产生方面取得突破性进展。在这项研究中进行了理论和初步的实验工作。通过理论计算，当激光束被傅里叶变换限制并锁模时，可以产生几个fs的激光脉冲。提出了几种产生超短脉冲的光学结构，如：G.猝灭激光器/短腔激光器/分布反馈激光器/激励器激光放大/双色受激拉曼发射。- 在我们的初步研究中，一个2-ns的激光脉冲产生的染料激光脉冲的长尾淬灭。实验证明，高功率脉冲激光可以有效地产生双色受激拉曼发射。本实验室研制的多程拉曼池可降低阈值，提高效率，并以双色受激拉曼辐射作为光源，对凝聚相和超音速射流中的样品进行激发。因此，它被证实是有用的样品在分析光谱学的测量。少

Two-color stimulated Raman emission was generated by introduction of a two-color laser beam into pressurized hydrogen, in order to obtain widely-tunable laser emission. The laser wavelength could be changed from 247 to 771 nm. However, it was technically difficult to simultaneously scan both the laser wavelengths. Then, a few numbers of rotational stimulated Raman lines were first generated by introduction of a circularly-polarized, single-color laser beam. Succeedingly, the polarization was changed to a linear, and many rotational and vibrational lines were generated by the two-color stimulated Raman effect. This technique allows a wavelength scan and is useful for analytical spectroscopy. It was also possible to generate either vibrational or rotational lines selectively by optimizing the polarization of the beam. the pressure of hydrogen, and the beam focusing condition. Alternatively. the separation of the rotational lines could be changed from 587 to 354 cm^<-1> by replacing ortho … More -hydrogen with para-hydrogen. This approach is useful to increase the density of the rotational lines in the specified spectral region.Equally-spaced, multi-frequency laser emission can, be generated by two-color stimulated Raman emission. As is known from Uncertainty principle, ultrashort light pulses can be generated by the laser with wide frequency components. Then, the presented approach might give a break-through in generation of ultrashort pulses. Theoretical and preliminary experimental works were performed in this study. By a theoretical calculation, a laser pulse with several fs could be generated, when the laser beam was Fourier-transform limited and was modelocked. Several optical configurations for generation of ultrashort pulses were proposed, e. g. a quenching laser/short-cavity laser/distributed feedback laser/exciter laser amplification/two-color stimulated Raman emission. - In our preliminary study, a 2-ns laser pulse was generated by quenching the long tail of the dye laser pulse. It was verified that a high-power, sh(Yrt-pulse laser is useful for efficient generation of two-color stimulated Raman emission. The multi-pass Raman cell developed in our laboratory was useful for reduction of threshold and improvement of the efficiency.Two-color stimulated Raman emission was used as a light source for excitation of the sample in a condensed phase and in a supersonic jet. Thus it was verified to be useful for measurement of the sample in analytical spectroscopy. Less