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Rotational relaxation in a line-selected continuous HF chemical laser

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Abstract

Rotational relaxation effects in a cw chemical laser amplifier or a line-selected oscillator are examined in terms of a simple analytical model. Three rotational levels in each vibrational level of the lasing transition are taken to have finite rotational relaxation rates. The results indicate the effects are likely to be significant, lowering the available power and leading to an optimum level of the line intensity for maximum power output, apart from consideration of optical losses at mirrors, windows, etc. While the model accounts for Δj = ±1 transitions only, the collisional transition probability was augmented in the computations in an attempt to provide high estimates for the rotational relaxation rates, including factors such as Δj > 1 transitions.

© 1975 Optical Society of America

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