Wide-aperture several THz bandwidth CO_2 laser amplifier with transverse pumping by the pulsed kJ power chemical HF laser

摘要

For the grounding of the program of the wide-aperture several THz bandwidth CO_2 laser amplifier creation it was initiated the experimental investigation of a HF laser radiation transformation in a multiatmospheric CO_2/He medium. The CO_2/3He mixture (46x50x63 mm~3, 4 atm) was pumped by the 1P8 spectral line of the pulsed chemical HF laser (858 J, 1 mus). Transverse pumping geometry was used. Up to the power density of 2.7 MW/cm~2 an absorption saturation was not observed. At the deposited energy of 58 J and output coupling of 20percent it was obtained CO_2 laser pulse of 2.7 J (quantum efficiency was about 18.6percent). The estimated small-signal gain was of 0.05 cm~(-1).