Abstract
Published methods for suppressing frequency noise and stabilizing the frequency of a single mode injection laser are based on controlling injection with a negative feedback loop which holds frequency and phase near some etalon value. Many of the absorption lines in the spectra of H20 [i, 2], NH 3 [2, 3], CH4 [4], CO 2, etc., in the 0.8-1.5 ~m range, associated with vibrational-rotational transitions, are reliable reference lines unaffected by temperature drift. The advantage of these lines over the resonant lines of rubidium, cesium, and other alkali metals [5, 6], as well as the optogalvanic resonances of inert gas atoms [7], is their multitude and the fact that they cover a broad range of frequencies (this is important because semiconductor lasers emit on widely scattered frequencies), and the disadvantage is their low absorption and, as a result, weak frequency discrimination.
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