A GaAs diode laser with an external tunable frequency-selective resonator was used to record the hyperfine structure of the D2 line of cesium. The suitability of a diode laser with an external resonator for use in intracavity spectroscopy was demonstrated for the first time. A study was made of the luminescence of cesium vapor under the action of resonant laser excitation.
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Raab et al. (1981) studied this question.
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