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Line shape parameter analysis of individual vibrational-rotational transitions in a CO2laser amplifier

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2 Author(s)
Sato, H. ; National Defence Academy, Tokyo, Japan ; Miura, Y.

Applying the measured incremental irradiance gain per unit plasma length for various input irradiances to the analytical formulas for a partially homogeneously broadened, saturated gain medium, the line shape parameters such as the small-signal gain, the saturation parameter, and the ratio of the Lorentzian to Doppler linewidths are obtained for individual vibrational-rotational transitions of a CO2laser amplifier. It is found that the homogeneous broadening becomes predominant across the lines with a higher gain, while the inhomogeneous broadening is emphasized across the remote lines with a lower gain from the central line for both 10 P and R branches. Pressure and discharge-current dependence on the lineshape parameter are also investigated for the typical two lines, i.e., 10 P -20 and -12 lines, together with discussions.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:19 ,  Issue: 3 )