COHERENT TRANSIENTS IN A GAS 13CH3F GENERATED BY STEP SWITCH OF ELECTRIC FIELD

Transient signals of optical nutations and free polarization decay arising in a gas ¹³CH₃F (rotational transition R(4,3) of vibration mode 0–1 ν₃ ) at the step-wise switch of electric field in the presence of resonant radiation of CO₂ laser are investigated. In the limit of low intensity of radiation the peaks of free polarization decay are observed; the frequency of their appearance is proportional to the electric field strength. The number of observable peaks of free polarization decay decreases at laser intensity growth, and free polarization decay signal becomes indistinguishable at a background of optical nutations at high laser intensity. At high laser intensity the signal of transient optical nutations dominates. Results of calculations are in qualitative agreement with experimental data.

Keywords:
transient optical nutations, levels Stark switching, free polarization decay.
УДК 535.21, 533.5, 537.228.5

COHERENT TRANSIENTS IN A GAS 13CH3F GENERATED BY STEP SWITCH OF ELECTRIC FIELD