مطالعه اثر خلوص گاز نیتروژن و طول محیط فعال بر پارامترهای لیزری در سیستم نوسانگر – تقویت کننده لیزر نیتروژن

In an Oscillator-amplifier N۲-laser system of the type TE-TE with the amplifier active effective length of ۳۱ cm, both operating with corona-preionizer, the gain coefficient (g۰) and saturation energy density (Es) measurements have been carried out for different gas pressures and gas purities. The details of our measurements are tabulated or presented graphically. The obtained values for the cases of used or cleaned electrodes are also presented for the comparison. At last, our g۰ values along with those of our previously reported values for the active length of ۹۴ cm and other reported values for the active lengths of ۴۵ and ۵۰ cm have been introduced for the comparison, and it was found that the measured values of g۰ follow a characteristic curve showing their strong dependency on the length of laser channels. The present observation indicated that while the length of laser channel has the major contribution to the g۰ values, the contributions of gas purities and cleaned electrodes are limited to at most ۱۹.۴% and ۱.۹%, respectively, at the gas pressure of ۱۰۰ Torr.