Abstract

Directional infrared emission at 1.37 and 5.23 μm is generated in Rb vapors that are stepwise excited by low-power cw resonant light. The radiation at 5.23 μm originating from amplified spontaneous emission on the $5{\mathrm{D}}_{5/2}\to 6{\mathrm{P}}_{3/2}$ transition and wave mixing consists of forward- and backward-directed components with distinctive spectral and spatial properties. Diffraction-limited light at 1.37 μm generated in the copropagating direction only is a product of parametric wave mixing around the $5{\mathrm{P}}_{3/2}\to 5{\mathrm{D}}_{5/2}\to 6{\mathrm{P}}_{3/2}\to 6{\mathrm{S}}_{1/2}\to 5{\mathrm{P}}_{3/2}$ transition loop. This highly nondegenerate mixing process involves one externally applied and two internally generated optical fields. Similarities between wave mixing generated blue and 1.37 μm light are demonstrated.

© 2014 Optical Society of America

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