Self Induced Transparency with CO2 Laser Pulses Propagating in an Ammonia Gas Absorber.
TEXAS UNIV AUSTIN ELECTRONICS RESEARCH CENTER
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Self induced transparency has been observed experimentally in two non-degenerate, vibration-rotation transitions in ordinary ammonia, NH3. These transitions could be tuned with external, static electric fields-- i.e., the Stark Effect--to coincidence with a pair of CO2 laser transitions at 1072 micrometers. In Stark fields of 12.33 kVcm and 14.6 kVcm, respectively, the asQ5,3,5 and saQ5,5,5 transitions of the mu2 fundamental vibration of NH3 are resonant with the P32 and R6 CO2 laser lines. That self induced transparency was observed, rather than saturation of the absorbing transitions, is proven by the measurement of an intensity dependent pulse delay as the pulse propagated through the absorber. Groundwork also was laid for an experimental study of the self induced transparency for degenerate transitions. The extent to which self induced transparency phenomena were displayed was determined by the existence and design of a Stark cell. Modified author abstract
- Physical Chemistry