Lasing of molecular HBr in the four-micron region pumped by a DF-laser

Abstract

High efficiency optical pumping of4-.tm HBr-laser was performed by the principal 2P9 line (3.836 jtm) of pulsed DF-laser. Precise coincidence revealed of this laser transition with R2 line of the fundamental absorption band of the heavy isotopomer ofhydrogen bromide was utilized. Lasing within 0.3 -15 Ton pressure range was observed in overall (4.0 17-4.215) tm spectral range, at both off-axis and the collinear pumping geometry (pump fluence of 0.2 -0.4 J/cm2, pulse FWHM duration ' 300 ns). Complex behaviour of HBr-laser emission peak intensity, pulse duration and time delay upon the gas pressure was analyzed. Energy conversion efficiency at P =10 Ton was increased from ' 2 % to more than 5%, when collinear scheme with better mode-matching was utilized. It is believed that the efficiency may be additionally improved by optimization ofHBr-laser cavity losses.

Study on the purification of hydrogen bromide gas by fractional distillation technique and its effect on improvement of copper–hydrogen bromide laser performance

“…[1][2][3][4][5][6][7] For all these applications, the purity of the HBr gas plays important roles, as it decides the performance efficiency, process consistency, and yields. [1][2][3][4][5][6][7] For all these applications, the purity of the HBr gas plays important roles, as it decides the performance efficiency, process consistency, and yields.…”