Zero-power gain measurements in a CW HF laser using a pulsed-probe laser
- 1 May 1973
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Quantum Electronics
- Vol. 9 (5), 550-553
- https://doi.org/10.1109/jqe.1973.1077512
Abstract
Zero-power gain measurements in a supersonic diffusion-type CW HF laser have been made using a pulsed HF probe laser. A peak zero-power gain of 10 percent/cm was measured on aP_{2}(3)vibrational-rotational transition and 7 percent/cm on aP_{1}(6)transition for flow rates corresponding to 1.8 kW of closed-cavity power. The variation of zero-power gain with rotational quantum numberJfits a simple rotational equilibrium model indicating increasing rotational temperatures with increasing distancexfrom the nozzle exit plane. The model also indicates a total inversion forx \leq 0.2in for theP_{2}(J)transitions and a partial inversion further downstream.Keywords
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