Research on the supersonic molecular beam laser

为了探索利用超音速分子束通过放电激励来发展高效率激光器的可能性，我们进行了以下实验。~lt；Na_2&Gt；的高振动X-A跃迁的高精度光谱这项实验的目的是获得高精度的光谱常数，足以搜索原子D线和分子跃迁之间的重合。我们使用了两步激发的激光诱导荧光光谱，其中第一个激光和随后的自发辐射泵浦了X态的高振动能级。因此，第二个激光可以泵浦更高的A态振动能级。我们测量了高达66的A-X带的v=66，并从已发表的光谱常数中得到了精确的校正值。放电激发的钠电子束的光谱。用辉光放电激发了一束钠离子，并利用上述实验数据对其荧光光谱进行了分析。我们发现钠原子的D线在钠-二聚体的跃迁中确实有一个重合，这是一个基态振动能级。我们研究了在超音速钠束中通过放电获得钠D线有效发射的方法。我们发现，在离喷嘴很近的两个电极之间的弧光放电发出强烈的光，这可能足以在钠二聚体的跃迁上产生布居反转。

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.