Abstract

We demonstrate how the orientation of the Rb cell can significantly affect the intensity and spectral characteristics of both the frequency up- and downconverted fields generated by nonlinear processes in Rb vapor. The efficiency of parametric wave mixing in Rb vapor excited to the $5{\mathrm{D}}_{5/2}$ level by two-color resonant laser light can be significantly increased by seeding the excitation region with coherent and directional radiation at 5.23 μm, which is resonant with the population inverted $6{\mathrm{P}}_{3/2}–5{\mathrm{D}}_{5/2}$ transition. It is shown that the process of velocity-insensitive two-photon excitation is central to understanding the observed coherent blue and mid-IR light enhancements, and that velocity-insensitive and velocity-selective two-photon excitations could produce two co-existing but spectrally and spatially distinguishable mid-IR fields at 5.23 μm.

© 2017 Optical Society of America

Amplified spontaneous emission at 5.23  μm in two-photon excited rubidium vapor

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