Saturation and alternate pathways in four-wave mixing in rubidium

Abstract

We have examined the frequency spectrum of the blue light generated via four-wave mixing in a rubidium vapor cell inside a ring cavity. At high atomic density and input laser power, two distinct frequency components separated by $116\pm 4$ MHz are observed, indicating alternate four-wave mixing channels through the $6p_{3/2}$ hyperfine states. The dependence of the generated light on excitation intensity and atomic density are explored, and indicate the primary process has saturated. This saturation results when the excitation rate through the 6p state becomes equal to the rate through the 5p state, giving no further gain with atomic density while a quadratic intensity dependence remains.

References in corpus (17)

• A room temperature single-photon source based on strongly interacting Rydberg atoms
• Enhanced frequency up-conversion in Rb vapor
• Coherent 455nm beam production in cesium vapor
• Collimated Blue and Infrared Beams Generated by Two-Photon Excitation in Rb Vapor
• Directional infrared emission resulting from cascade population inversion and four-wave mixing in Rb vapours
• Spiral bandwidth of four-wave mixing in Rb vapour
• Distinguishing nonlinear processes in atomic media via orbital angular momentum transfer
• Arithmetic with optical topological charged in step-wise excited Rb vapour
• Cavity-enhanced frequency up-conversion in rubidium vapour
• Parametric four-wave mixing using a single cw laser
• Four-Wave Mixing in Ultracold Atoms using Intermediate Rydberg States
• Parametric wave mixing enhanced by velocity insensitive two-photon excitation in Rb vapour
• Frequency evaluation of collimated blue light generated by wave mixing in Rb vapour
• Optical cavity for enhanced parametric four-wave mixing in rubidium
• Comparison of collimated blue light generation in ${}^{85}$Rb atoms via the D${}_1$ and D${}_2$ lines
• Linewidth of collimated wavelength-converted emission in Rb vapours
• Coherent blue emission induced by a combination of diode and femtosecond lasers