Non-collinear multi-wave mixing in a Doppler-broadened two-level medium

Anh Nguyen Tuan, Doai Le Van, Son Doan Hoai +1 more

Joseph Nilsen, Amnon Yariv

Third-order susceptibilities are calculated for a Doppler-broadened two-level system. The dependence of four-wave mixing on the angle θ between the pump and signal fields is studied, and the reflection coefficient is shown to have a narrow field of view that is inversely proportional to the ratio of the Doppler width to the homogeneous linewidth. For the collinear geometry, θ = 0°, the frequency dependence of the nondegenerate case is analyzed and shown capable of yielding a real-time narrow-bandwidth optical filter whose bandwidth is limited by the homogeneous linewidth.

Ilya Golub, R. Shuker, G. Erez

O. Di Lorenzo-Filho, Paulo C. de Oliveira, J. R. Rios Leite

Phase-conjugate emission by resonant degenerate four-wave mixing with two counterpropagating weak pump beams and a noncollinear strong object beam was calculated for a Doppler-broadened two-level system. Singlepeak Doppler-free lines with small saturation broadening at a collinear configuration became split for a wide angle. The effect is demonstrated with the use of a CO(2) laser and SF(6). Conversely, calculated line shapes with Stark splitting in a collinear arrangement became single peaked for a wide angle.

Pochi Yeh

Qiguang Yang, G. Xu, X. Liu +2 more