METHOD FOR LONGITUDINALLY STABILIZING AN OPTICAL CAVITY
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United States of America Patent
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Issued Date -
Oct 11, 2012
app pub date -
Sep 22, 2010
filing date -
Sep 23, 2009
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Abandoned
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Abstract
A method of stabilizing the distance (L) between two mirrors (3, 4) of an optical cavity (2). The method includes the steps of injecting into the cavity an incident light beam in the form of a comb of frequencies; observing the spectrum of the light emitted or reflected by the cavity by using a photodiode having at least two sensitive zones that are arranged relative to the emitted or reflected light in such a manner that when the spectrum is centered, the two sensitive zones of the photodiode are illuminated equally; and modifying the distance between the mirrors of the cavity so as to cancel any offset of the spectrum relative to a situation in which the spectrum is centered.
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