Abstract
We discuss theoretical and experimental results of subnatural linewidth laser spectroscopy of a Na beam. A spectral resolution beyond the natural linewidth can be obtained, only if the coherent response of the medium is observed for a long period compared with the natural lifetime. This is generally realized by applying a sudden disturbance to the medium and by observing the transient response. Various schemes based on this principle have been proposed and also realized in gamma-ray or radio-frequency spectroscopy.
© 1984 Optical Society of America
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