Collimated UV light generation by two-photon excitation to a Rydberg state in Rb vapor

Abstract

We use two continuous-wave (CW) laser beams of 780 nm and 515 nm to optically drive ${}^{85}$Rb atoms in a heated vapor cell to a low-lying Rydberg state 10D${}_{5/2}$. We observe a collimated ultraviolet (UV) beam at 311 nm, corresponding to the transition frequency from the 11P${}_{3/2}$ state to the 5S${}_{1/2}$ state. This indicates the presence of a coherent four-wave mixing process, built up by two input laser fields as well as a terahertz (THz) radiation of 3.28 THz that is generated by amplified spontaneous emission between the 10D${}_{5/2}$ and the 11P${}_{3/2}$ states. We characterize the 311 nm UV light generation and its dependence on various physical parameters. This scheme could open up a new possibility for generating narrow-band THz waves as well as deep UV radiation.

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Cited by in corpus (5)

• Gouy phase-matched angular and radial mode conversion in four-wave mixing
• Polychromatic, continuous-wave mirrorless lasing from monochromatic pumping of cesium vapor
• Directional THz generation in hot Rb vapor excited to a Rydberg state
• Intensity-correlated spiking infrared and ultraviolet emission from sodium vapors
• Spiking dynamics of frequency up-converted field generated in continuous-wave excited rubidium vapours