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10.6-µm amplification in metallic waveguide by external discharge pumping

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1 Author(s)
Koepf, Gerhard A. ; NASA, Goddard Space Flight Center, Greenbelt, MD, USA

Amplification of 10.6-μm radiation in a metallic waveguide and waveguide CO2-laser action was achieved by excitation of the CO2(0001) mode by vibrational energy transfer from metastable N\min{2}\max {\ast }(\upsilon = 1) molecules. Excitation of N2was accomplished in a separate dc discharge tube. The N2-He mixture, after flowing through the discharge region, was pumped into the waveguide and there CO2was added. Maximum small-signal gain values of 25.6 and 15.3 dB/m were obtained at amplifying waveguide sections of 2 and 6-cm length, respectively. A theoretical analysis, based on rate equations for the (0001) and the (1000) states of CO2and the concentration of N\min{2}\max {\ast }(\upsilon = 1) molecules, is presented, which leads to predictions for the small-signal gain and the saturation intensity. In the pressure range covered by experiments the calculated gain values were found to be consistent with measurements.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:12 ,  Issue: 1 )