Self-induced transparency in HF gas using an HF chemical laser
Self-induced transparency (SIT) of HF laser radiation at lambda 2.7 ..mu..m has been observed in low-pressure HF gas for several P/sub 1/(J) transitions. Low-loss propagation through the resonantly absorbing medium was observed, and intensity threshold values for the onset of SIT were found to agree with those predicted by theory. Laser pulses of high peak power and/or long duration were found to break up into several individual 2..pi.. pulses. The resulting frequency of modulation in the output waveform was in quantitative agreement with theory and the damping of the modulation envelope was in agreement with the rotational relaxation time of the HF transition. Measurements showed that the velocity of propagation of the laser pulse through the HF gas at millitorr pressures was as little as 1/40 the speed of light in vacuum.
- Research Organization:
- Environmental Research Institute of Michigan, Ann Arbor, Michigan 48107
- OSTI ID:
- 7260251
- Journal Information:
- Appl. Phys. Lett.; (United States), Vol. 31:2
- Country of Publication:
- United States
- Language:
- English
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