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Soviet Journal of Quantum Electronics

Phase conjugation of infrared radiation in atmospheric ice films

Naum K. Berger, V V Novokhatskiĭ, S. R. Simakov

Published Jul 31, 1990• 1 citation
Publisher

Abstract

Ice films 1–10 μm thick were used in phase conjugation of infrared radiation. The experimental reflection efficiency was 30% at wavelengths of λ = 5–6 μm, 55% at λ = 10.6 μm, and 80% at λ = 9.28 μm. These results were obtained for cw radiation when the intensity of the reference wave was 2–6 W/cm2 and the dynamic range of the signal wave intensity was 103.

DOI
10.1070/qe1990v020n07abeh006997

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Ice films 1–10 μm thick were used in phase conjugation of infrared radiation. The experimental reflection efficiency was 30% at wavelengths of λ = 5–6 μm, 55% at λ = 10.6 μm, and 80% at λ = 9.28 μm. These results were obtained for cw radiation when the intensity of the reference wave was 2–6 W/cm2 and the dynamic range of the signal wave intensity was 103.
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.
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.
The phase conjugation (PC) reflectivity of the laser radiation inside its own laser medium reflects the non-linear properties of the medium. To study the properties of carbon monoxide (CO) laser medium the temporal and spectral characteristics of PC reflectivity of pulsed e-beam controlled discharge cryogenically cooled CO laser radiation under degenerate four-wave mixing (DFWM) inside its own laser medium were studied experimentally. The interaction length of DFWM was about 100 cm. The pulse length of the CO laser beam was 50 - 500 µs, the gas density was up to 0.5 Amagat, the gas temperature was about 120 K.