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Soviet Journal of Quantum Electronics

Spectral dependences of reflection in a degenerate four-wave interaction of infrared laser radiation in resonant SF6, CF3Br, and CD4gases

Sergey S. Alimpiev, V S Nersisyan, С. М. Никифоров, Boris G. Sartakov

Published Apr 30, 1989• 2 citations
Publisher

Abstract

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.

DOI
10.1070/qe1989v019n04abeh007904

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 1, 1990•0 citations
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.
CW phase conjugation on the ν3 vibrational bands of SF6 and OsO4 is demonstrated as a means of investigation in high resolution spectroscopy through resonant degenerate four-wave mixing at 10.6 µm by using a stable low power CO2 laser operating on the P(18), P(16), P(12) lines respectively. Peak reflectivities of 3.8 10-3 are measured in SF6. They only reach 0.34 10-3 in OsO4. Phase conjugate spectra with 2 MHz, namely sub-Doppler resolutions, are compared with simultaneous recordings of the saturated-absorption spectra over a 80 MHz bandwidth. The saturation splitting encountered on a one-photon transition in SF6 is also analysed in terms of pressure broadening and pump imbalance.
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.
Energetic, temporal and spectral characteristics of the process of phase conjugation (PC) at intracavity degenerate four wave mixing (DFWM) of frequency selective pulsed e-beam controlled discharge CO laser radiation have been studied both experimentally and theoretically. Maximum PC reflectivity (PCR) on energy comes up to 1.5% being independent of specific input energy. The dependencies of PCR on energy have quite different behavior for various selected spectral lines. An influence of lasing and PC process in adjacent vibrational bands on PCR for the selected spectral line has been experimentally demonstrated, PCR decreasing at switching on adjacent vibrational bands. The numerical model has been formulated to simulate the temporal behavior of PC process on large scale gain (amplitude) and refraction (phase) gratings formed in the active medium of CO laser. The trend in the calculated temporal behavior of PCR is the same as for the experimental result, the theoretical PCR being higher as compared to experimental one. The resonance (amplitude) mechanism of PC process seems to be a prevailing one for DFWM of CO laser radiation.
An experimental investigation was made of phase conjugation under conditions of degenerate four-wave interaction of CO2 laser radiation in carbon tetrachloride as a function of various parameters of the signal radiation and of the experimental geometry. It was found that the conjugation accuracy for a single-mode signal beam with a divergence of 2 mrad was 87%, but when a phase plate introducing a divergence of 70 mrad was used, the accuracy was 77%. The reflection efficiency and the phase conjugation quality depended strongly on the ratio of the energy density of the signal wave to the energy density of the pump wave. An investigation was made of the dependence of the reflection coefficient on the angular mismatch between the counterpropagating pump waves and on the matching of the optical paths of the interacting waves.
Degenerate-four-wave mixing (DFWM) is an important technique for the generation of phase-conjugate wave, to which much attention has been paid. In this paper. a tunalile CW CO2 1.aser is used as the pump sourse and gaseous SF6 as the nonlinear medium, the dependence of reflectivity of phase-conjugate wave generated by DFWM on the pump intensity, the pressure in SF6, the angle between the pump and probe beams as welt as the potarization of the optical fields etc, is investigated experimentatty and exptained theoretically. Peak reftectivity of 2.1x101 is abtained at P=4 Torr in the gaseous SF6. In the Doppler-free phase-conjugate spectrum of SF6 five absorption dips are observed and the spectral resolving power is measured to be about 3 MHz.