Abstract
The results are given of theoretical and experimental investigations of frequency-modulation saturated-absorption and saturated-dispersion resonances in a linear He–Ne laser employing an intracavity methane absorption cell. The ultimate sensitivity of the method of frequency-modulation spectroscopy of an intracavity absorbing gas was shown to be 10−11cm−1Hz1/2. Studies were made of the stability and of the frequency shifts of a linear He–Ne/CH4 laser stabilized by frequency-modulation resonances of the saturated dispersion and saturated absorption. A frequency stability of 8×10−15 for an averaging time of 1 sec and a frequency reproducibility of 10−13 were obtained.
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