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Zero-power gain measurements in a CW HF laser using a pulsed-probe laser

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3 Author(s)
R. Chodzko ; Aerospace Corporation, El Segundo, CA, USA ; D. Spencer ; H. Mirels

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 a P_{2}(3) vibrational-rotational transition and 7 percent/cm on a P_{1}(6) transition for flow rates corresponding to 1.8 kW of closed-cavity power. The variation of zero-power gain with rotational quantum number J fits a simple rotational equilibrium model indicating increasing rotational temperatures with increasing distance x from the nozzle exit plane. The model also indicates a total inversion for x \leq 0.2 in for the P_{2}(J) transitions and a partial inversion further downstream.

Published in:

IEEE Journal of Quantum Electronics  (Volume:9 ,  Issue: 5 )