Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1990-05-04
1991-11-26
Sikes, William L.
Coherent light generators
Particular beam control device
Optical output stabilization
372 38, 372 29, 372 20, H01S 313
Patent
active
050688642
ABSTRACT:
In one aspect, frequency fluctuations are stabilized in a laser beam using a frequency stabilization stage that includes a modulator for dithering (i.e., periodically scanning) the frequency of the laser beam, and absorption resonance cell that has a resonance at a predetermined linewidth to which the dithered beam is applied. The output of the cell is synchronously demodulated with respect to the dithering to produce a correction signal that represents the frequency fluctuations with respect to a reference frequency within the absorption linewidth, and the correction signal is used in a configuration which corrects for the frequency fluctuations and produces from the stage a non-dithered, frequency stabilized output. In another aspect, the frequency of the laser beam is controlled using the molecular or atomic resonances of a plurality of successive frequency stabilization stages. Each stage includes an independent control servo loop incorporating a respective absorption resonance cell and constructed to produce frequency correction referenced upon a predetermined resonance of the absorption cell, and the predetermined reference resonances of successive absorption cells have successively narrower linewidths. Each successive frequency stabilization stage, referenced on its predetermined resonance, serves to reduce the range of frequency fluctuations of its output relative to its input.
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A. Gatterer, S. J., H. W. Thompson, V. A. Fassel, F. A. Miller; Spectrochimica Acta; 1960; pp. 570-574.
E. L. Muetterties; Inorganic Syntheses; pp. 158-161.
Laser Science, Inc.
Morse Susan S.
Sikes William L.
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