Development of a Repetitive Widely Tunable Single Mode TEA CO_2 Laser, its Application on NH_3 Laser and Related Studies

摘要

The importance of a carbon dioxide laser operating repetitively on a single longitudinal mode (SLM) either on one or multiple transitions in selective photochemical studies is well recognised. Further, the generation of coherent radiation at longer wavelengths with a carbon dioxide laser as the pump source plays a significant role in these studies. In this dissertation four important features of the pump laser, which, among others, enhance the efficiency of both the above-mentioned processes, are addressed. They are a) the single frequency operation of the pump laser, b) the wide tunability of the emission frequency of the pump laser with respect to the absorption feature of the molecule of interest, c) the capability of the pump laser to simultaneously operate on more than one frequency and d) its repetitive operation capability. In addition, the operation of molecular lasers (in particular NH_3 laser) optically pumped by CO_2 laser providing coherent radiation in the longer wavelength region also forms an important part of this thesis.