GENERATION OF STOKES AND ANTI-STOKES RADIATION IN RAMAN MEDIA.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF ELECTRICAL ENGINEERING
Pagination or Media Count:
A three-dimensional analysis of stimulated Raman emission is presented for a medium through which a cylindrical laser beam passes. The buildup of the Stokes radiation from the spontaneous fluctuations in the Raman medium is considered. A generalization of the fluctuation-dissipation theorem is derived relating the current-current fluctuations at the Stokes frequency to the laser-induced negative conductance at this frequency. The anti-Stokes radiation is treated as arising from the interaction of the laser field and the molecular vibrations accompanying the Stokes radiation. The anti-Stokes radiation emerges in a narrow cone around the familiar phase-matching direction given by B- 2k - B, where B- and B are the real parts of the propagation constants of Stokes and anti-Stokes waves in the medium, and k is the laser propagation vector. The angular width of the anti-Stokes radiation cone is evaluated. Author