Methods and schemes of phase conjugation in the middle infrared

D. A. Depatie, D. C. Haueisen, Ahmet Elçi +1 more

Ding Ding

K. Leung, Richard B. Holmes, Allen M. Flusberg

Alexander A. Ageichik, Oleg G. Kotyaev, Yu. A. Rezunkov +2 more

As it is known, self-conjugation of the IR laser beam via Brillouin radiation stimulated scattering phenomenon is not realised because of some physical limits on radiation intensity which are the principal limitations, to the present time. That is why, one of the promising technique of phase conjugation of infrared radiation is a self-conjugation of a laser beam wavefront via four wave interaction in a nonlinear medium with feed-back loop (FWMF) [1]. Unlike conventional our wave mixing schemes, the FWMF self-conjugation is supposed to be realised without any additional beams pumping a phase conjugation mirror.

Gaohang He

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.