Active Filter Using Optical-Optical Double Resonance Effect of Optogalvanic Signal.

研制了一台利用砷化镓半导体激光器测量光电流效应的光-光双共振信号的激光光谱仪。其中一个用于泵浦的激光器通过施加1.5 kHz的正弦波进行频率调制，并稳定到电流信号的中心频率。来自另一束经1 kHz调制的光束从反方向或单向注入到电池组中，并绕过与泵浦电平相连的过渡段。用四能级系统和谱线轮廓来描述具有亚多普勒线宽的信号，得到了理论公式，并用Kr和Xe的6P‘&lt；12&6s&lt；12&gt；*6p&lt；*6p&lt；11&gt；进行了0.8微米波长范围内的双共振实验。用偶质量原子的信号解析了^&lt；83&gt；Kr，^&lt；Xe和^&lt；31&gt；Xe的超精细结构。分辨率，Q…测量了更多的因素和双共振信号的可调性。在实验误差范围内，得到的超精细耦合常数与用浓缩态同位素测得的值一致。我们认为，无多普勒光电流双共振谱是研究电子激发态中的同位素分离和高精细耦合效应的一种新的高分辨率光谱技术。利用Ar的4p&lt；22&gt；*4s&lt；11&gt；*4p&lt；11&gt；系统对相位调制激光光束中的边带进行了探测。在正常的电流信号中可以检测到边带，而亚多普勒双共振信号几乎检测不到。我们认为亚稳态的4S_(12)或4P‘_(00)不包括在泵浦系统中。我们对ICL和IBR的A*X系统的电子跃迁进行了激光光谱研究，在0.8微米的波长范围内用吸收谱线作为光谱图谱。较少

A laser spectrometer has been developed for measuring the optical-optical double resonance signal of the optogalvanic effect by using GaAs semiconductor lasers. One of the laser used as for pumping was frequency-modulated by applying a sine wave of 1.5kHz and stabilized to the center frequency of the galvanic signal. The beam from other one modulated by 1kHz was introduced to the galvanic cell from the counter or unidirection to the pumping beam and swept around the transition connected to the pumping level. The theoretical formulation has been obtained by using the four level system and the line profile to describe the signal having the sub-Doppler line width.The double resonance experiments in the wavelength region of 0.8 mum have been done by using the 5P'_<01>*5S'_<00>*5P'_<11> system or Kr and the 6P_<12>*6S_<12>*6P_<11> of Xe. The hyperfine structures of ^<83>Kr, ^<129>Xe and ^<31>Xe have been resolved from the signals belonging to the even mass atoms. The resolving powers, the q … More uality factors and the tunability of the double resonance signal have been measured. The hyperfine coupling constants obtained agreed to the values determined by using the concentrated isotopic species within the experimental error. We consider that the Doppler-free optogalvanic double resonance spectroscopy developed is useful as a novel high resolution spectroscopic techinic to study the isotope separation and the highperfine coupling effect in the electronic excited states.The detection of the sidebands in the phase modulated laser beam has been done using the 4P_<22>*4S_<11>*4P_<11> system of Ar. The sidebands were detected in the normal galvanic signal, but the sub-Doppler double resonance signal was hardly detected. We consider that the 4S_<12> or 4P'_<00> of the metastable state has not included in the pumping system.The laser spectroscopy of the electronic transition of the A*X system of ICl and IBr has been carried out to use the absorption lines as a spectral atlas in the the wavelengt region of 0.8 mum. Less