Observation of infrared phase conjugation in molecular gases

David A. Depatie, D. C. Haueisen

Alexander A. Betin, V E Sherstobitov

Y. Ben-Aryeh, Aharon Postan

Sergey S. Alimpiev, V S Nersisyan, С. М. Никифоров +1 more

Spectral dependences of reflection in a degenerate four-wave interaction of CO2 laser radiation in resonant SF6, CF3Br, and CD4 gases were investigated with a spectral resolution of 5 × 10 −2 cm − 1. A structure associated with one- and two-photon vibrational transitions in the gases was observed in the spectra. High reflection coefficients (of some tens of percent) were achieved by optimizing the phase conjugation conditions whilst maintaining the resonant character of the reflection.

Oleg L. Antipov, Alexander A. Betin, E. А. Zhukov +1 more

Theoretical and experimental investigations were made of a four-wave interaction of middle-infrared radiation based on a thermal nonlinearity of absorbing liquids and gases. A study was made of the influence of parasitic effects associated with heating of a nonlinear medium (such as the thermal lens effect, frequency sweeping of interacting waves, thermal expansion of the medium, and convection) on the efficiency of the four-wave interaction and the quality of phase conjugation utilizing this interaction. The conditions under which this influence is minimal were identified. An experimental study was made of phase conjugation of CO 2 laser radiation by a four-wave interaction in CCl 4 with a high reflection coefficient (up to 20% in the cw regime). The attained phase conjugation was limited the thermal lens effect, but this could be compensated.

B. Raghavendra Prasad, Chinnia Subramanian