Abstract

A cesium-based resonance fluorescence monochromator with a spectral resolution of 200  MHz and a tunable response over the D2 absorption line of cesium (380  MHz) is described. The narrow spectral response is achieved through excitation of a monokinetic population of the 6 P3/22   state by arrangement of the excitation lasers in either a copropagating or a counterpropagating orientation. The narrow spectral response of the detector allows for excitation of specific hyperfine components involved in the 6 P3/22   F=35 to 6 D5/22 F=26 transition (917.23  nm). The selectivity gained through resolving specific hyperfine transitions allows for a photon detector that is both spectrally tunable and narrow. We report the sub-Doppler linewidths achieved through various laser beam orientations. We also describe how these beam geometries can be applied to spectrally narrow and tunable image detection.

© 2001 Optical Society of America

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