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CO 2 LASER DIFFRACTION BY MULTIWAVE MIXING IN SF

J. W. R. Tabosa, Claudio Lenz Cesar, M. Ducloy, J. R. Rios Leite

Published Jul 18, 1988• 0 citations
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Abstract

Spatially phase matched one photon resonant and degenerate multiwave mixing [1, 2] in a diffraction configuration has been done in SF6 with a CW CO2 laser. Resonance was obtained with the 60MHz tunable 10.6μm P(18) line of a CO2 laser overlapping the A 2 1 P(33) line of SF6 which has[3]: Doppler linewidth of 29MHz, a collision broadening of 17MHz/Torr and a saturation intensity of 8W/cm Torr2. The experiments were done according to figure 1. A process depending on χ(2n+1) may interpreted as the absorption of n photons from the beam IF, along with n photons emitted in beam IP and then the absorption of one photon from IB to be emitted as the diffracted beam ID, all events at the same frequency ω. Accordingly, the nonlinear polarization will be phase matched for the direction K → D + n ( K → F − K → P ).

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Phase conjugation (PC) processes at degenerate four-wave mixing (DFWM) in the active medium of a pulsed e-beam controlled discharge CO2-laser were studied both experimentally and theoretically. The experiment was carried out with the following parameters: laser gas mixture CO2:N2:He=1:2:4, gas pressure 0.3 bar, active medium length 1.2 m, resonator length 12 m (17.7 m for single line laser), interaction angle ~10 mrad at DFWM without optical delay between probe wave and co-propagating pump one. Integral PC reflectivity (PCR) strongly depends on such parameters as: specific input energy (Fig. 1); intensity ratio for probe J3 and co-propagating pump J1 wave (Fig.2); coherency of the laser radiation, that varied by rotation of mutual polarization or with optical delay between probe wave and co-propagating pump one; geometry of DFWM; output mirror reflectance Rout (8-80%) (PCR was maximum with Rout of 8% but best quality of PC signal was observed with Rout =80%); gas mixture composition and pressure, being maximum for a mixture with a low fraction of helium and at higher pressure (up to 0.6 bar). A periodical dependence of PCR on optical delay between probe and co-propagating pump wave with periods 10−3 and 10−5 m was observed. The PCR did not depend on spectral content and a degree of linear polarization of the laser radiation.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jan 1, 1998•0 citations
Spatially phase matched one photon resonant and degenerate multiwave mixing [1, 2] in a diffraction configuration has been done in SF6 with a CW CO2 laser. Resonance was obtained with the 60MHz tunable 10.6μm P(18) line of a CO2 laser overlapping the A 2 1 P(33) line of SF6 which has[3]: Doppler linewidth of 29MHz, a collision broadening of 17MHz/Torr and a saturation intensity of 8W/cm Torr2. The experiments were done according to figure 1. A process depending on χ(2n+1) may interpreted as the absorption of n photons from the beam IF, along with n photons emitted in beam IP and then the absorption of one photon from IB to be emitted as the diffracted beam ID, all events at the same frequency ω. Accordingly, the nonlinear polarization will be phase matched for the direction K → D + n ( K → F − K → P ).
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.
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.
Phase conjugation (PC) processes at degenerate four-wave mixing (DFWM) in the active medium of a pulsed e-beam controlled discharge CO2-laser were studied both experimentally and theoretically. The experiment was carried out with the following parameters: laser gas mixture CO2:N2:He=1:2:4, gas pressure 0.3 bar, active medium length 1.2 m, resonator length 12 m (17.7 m for single line laser), interaction angle ~10 mrad at DFWM without optical delay between probe wave and co-propagating pump one. Integral PC reflectivity (PCR) strongly depends on such parameters as: specific input energy (Fig. 1); intensity ratio for probe J3 and co-propagating pump J1 wave (Fig.2); coherency of the laser radiation, that varied by rotation of mutual polarization or with optical delay between probe wave and co-propagating pump one; geometry of DFWM; output mirror reflectance Rout (8-80%) (PCR was maximum with Rout of 8% but best quality of PC signal was observed with Rout =80%); gas mixture composition and pressure, being maximum for a mixture with a low fraction of helium and at higher pressure (up to 0.6 bar). A periodical dependence of PCR on optical delay between probe and co-propagating pump wave with periods 10−3 and 10−5 m was observed. The PCR did not depend on spectral content and a degree of linear polarization of the laser radiation.