Research on the supersonic molecular beam laser

为了研究利用超声速分子束通过放电激发来研制高效激光器的可能性，我们进行了以下实验。<Na_2>高振动X-A跃迁的高精度光谱。这个实验的目的是获得一个高精度的光谱常数，足以寻找原子D线和分子跃迁之间的一致性。我们采用两步激发的激光诱导荧光光谱法，其中第一个激光和随后的自发发射泵浦X态的高振动能级。因此，第二个激光器可以泵送更高的A态振动能级。我们测量了高达v=66的A-X波段，并从公布的光谱常数中获得了精确的校正值。放电激发钠束的光谱学。用辉光放电激发一束钠离子，并利用上述实验数据对其荧光光谱进行了分析。我们发现钠原子D线确实与起源于地面振动水平的钠-二聚体跃迁有重合。研究了在超声钠束中放电获得钠D线的有效发射方法。我们发现，放置在非常靠近喷嘴的两个电极之间的电弧放电会发出强烈的光，这可能足以产生二聚体钠跃迁的人口反转。

To investigate the possibility to develop a highly efficient laser using a supersonic molecular beam by a discharge excitation, we have performed following experiments.1. High precision spectroscopy of high vibrational X-A transitions of <Na_2> . The purpose of this experiment was to obtain a high precision spectroscopic constants sufficient for the search of coincidences between atomic D lines and molecular transitions. We used laser induced fluorescence spectroscopy by two step excitation, where the first laser and the following spontaneous emission pumped high vibrational levels of X states. Thus, the second laser could pump still higher vibrational levels of A state. We measured up to v=66 of A-X band and obtained precise corrected values from published spectroscopic constants.2. Spectroscopy of a discharge excited sodium beam. A sodium beam was excited by a glow discharge, and its fluorescence spectrum was analyzed using data obtained by the above experiment. We have found that sodium atomic D line do have a coincidence between a sodium-dimer transtion originating a ground vibrational level.3. We investigated methods to obtain efficient emission of sodium D line by discharge in a supersonic sodium beam. We have found an arc discharge between two electrodes placed very close to the nozzle emits strong light, which may be sufficient for producing population inversion on the transition of sodium dimer.