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Applied Physics Letters

Optical isolation using a Doppler-broadened molecular absorber

F. Keilmann, R.L. Sheffield, Michael S. Feld, Ali Javan

Published Dec 1, 1973• 6 citations
Publisher

Abstract

A new principle for optical isolation based on the saturation of a Doppler-broadened resonance is described. It depends on an initial difference in the power levels of the incident and reflected waves. The technique is demonstrated using an SF6 absorber to isolate the P(18) line of the CO2 transition at 10.57 μm.
DOI
10.1063/1.1654766

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Optics Letters•Dec 1, 1988•13 citations
The authors consider the Doppler-broadened index of refraction of a two-level molecule of a gas for a weak travelling electromagnetic plane wave in the presence of a strong plane wave travelling in the opposite direction at the same frequency. The authors use the FVH vector model for a two-level system to calculate the real part of the non-linear susceptibility of the gas. The optical dispersion curve exhibits a wiggle at the centre line, that broadens and deepens as the gas is increasingly saturated by the strong incident wave.
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.
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 ).