Phase conjugation in ammonia

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Abstract
We compare theoretical calculations with experimental data for phase conjugation via degenerate four-wave mixing processes in NH3. The theory is based on a quantum-mechanical rotovibrational model of ammonia that includes molecular absorption. Calculations demonstrate that phase conjugation in NH3 is sensitive to absorption and that there is a dip in the phase conjugate efficiency on resonance, caused by Doppler broadening. Calculated efficiencies are in order-of-magnitude agreement with the experimental ones.