Study on ShortーPulsed UV Lasers Using New Longitudinal Excitation Techniques

这个项目的目的也是一个简短的-脉冲紫外线激光器与纵向兴奋结合在其尺寸和良好的光束质量上，其有效的预电离技术从未开发出来，而且激光器进行了可怕的研究。我们开发了一种新的预电离技术和激光管，并成功地获得了N_2激光器和XeCl刺激激光器动作。本项目的目的是在设备上进行系统研究，这些脉冲紫外线激光器具有纵向激发，并调查实际激光器的可能性。研究结果（1）激光设备（激发电路、激光管、气体供应系统等）它是设计和构造的。一个N_2激光器和一个XeCl刺激激光器的行为被测试在细节和最佳条件被确定。（2）具有矩形交叉部分的纵向兴奋的N_2激光器是设计的，而更高的激光器功率是在其具有圆形交叉部分的。（3）具有高重复率的高兴奋电路被组装，而相对稳定的激光性能被获得高达100赫兹。（4）使用cw环染料激光器的吸收测量系统是构造的，其可测量原子密度的临时变化是测量的。（5）测试了长时间刺激的N_2激光器和XeCl刺激器激光器的性能，并用模拟分析组合了激光功率和电压与当前的测量特征。（6）如果N_2和XeCl激光器与长距离激发可能是实际的，也可能不是基于结果的基础（1） - （5）。

Purposes of This ProjectAlthough a shortーpulsed uv lasers with longitudinal excitation is compact in its size and good in its beam quality, its efficient preionization technique has not ever been developed and that laser has scarcely been studied. However we developed a new preionization technique and laser tube, and succeeded in obtaining N_2 laser and XeCl excimer laser actions. The purposes of this project are to perform systematic studies on devices and mechanisms of these pulsed uv lasers with longitudinal excitation and to investigate the possibility as practical lasers.Research Results(1) Laser devices (excitation circuit, laser tube, gas supply system, etc.) were designed and constructed. Behaviors of a N_2 laser and a XeCl excimer laser were examined in detail and the optimum conditions were determined.(2) The longitudinally excited N_2 laser with rectangular cross section was designed and the higher laser power was obtained in it than in that with circular cross section.(3) The excitation circuit of high repetition rate with a thyratron was assembled and the relatively stable laser performance was obtained up to 100 Hz.(4) The absorption measurement system using the cw ring dye laser was constructed and the temporal variation of the He metastable atom density was measured.(5) The performances of the longitudinally excited N_2 laser and XeCl excimer laser were examined, with combining the measured characteristics of the laser power and the voltage vs current with simulation analysis.(6) It was discussed if the N_2 and XeCl lasers with longtudinal excitation could be practical or not on the basis of the results (1) - (5).