A cesium-based resonance fluorescence monochromator with a spectral resolution of 200 MHz and a tunable response over the absorption line of cesium (380 MHz) is described. The narrow spectral response is achieved through excitation of a monokinetic population of the 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 to 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.
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