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Journal of Molecular Spectroscopy

Observation of the Stark Effect in the ;gn3Band of Methane by Saturated Dispersion Technique

D A Tyurikov, E. Poernomo, G. Kramer

Published Aug 1, 1997• 1 citation
Publisher
DOI
10.1006/jmsp.1997.7324

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The results are given of an experimental investigation of the structure of the λ= 3.39 μ methane line by recording saturated dispersion resonances. A method is described for reducing the intensity of the laser field in the absorbing medium to a value of < 10-6 W/cm2 and thus ensuring that the resolving power of the method is determined mainly by the collisional and field broadening of the lines, and exceeds considerably the transit limit. A 2.2 kHz doublet line splitting, resulting from the recoil effect, was recorded using a laser having a 3-cm diameter beam.
An investigation is made of the serious limitations on the growth of the amplitude of a Stokes wave associated with the optical Stark effect and with the dispersion of the group velocities of the interacting pulses. It is shown that when the distance traversed exceeds a certain length, the gain due to stimulated Raman scattering reaches saturation whereas the spectrum of the scattered light becomes broader and acquires a line structure. Saturation of the scattering is not manifested at pump intensities sufficient to bleach the scattering medium. The gain can be optimized by altering the offset from a resonance.