Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1992-12-31
1994-04-19
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Optical output stabilization
372 26, H01S 313
Patent
active
053053338
ABSTRACT:
Using the interferometer technique, a laser light beam is split into two beams one of which is directed along a first light path having a fixed length and the other is directed along a second light path having a variable length. The length of the second light path is varied by a mirror assembly mounted on a piezoelectric block, the length of which is controlled by a modulation signal corresponding to the desired information signal. When the two light beams are recombined at the ends of the first and the second light paths, the varying of the length of the second light path results in a variable phase of the second light beam with respect to the first light beam that is modulation signal dependent at the precise point of recombination of the first and second light beams. The effect of the variable phase combination of the first and second light beams is a vectorial phase addition, the resultant laser light beam after this vectorial combination being intensity (amplitude) modulated by the modulation signal.
REFERENCES:
patent: 4815851 (1989-03-01), Soohoo
patent: 4921354 (1990-05-01), Soohoo
patent: 5112128 (1992-05-01), Soohoo et al.
Boardman Allen H.
Kaylor William R.
Goodman Edward W.
Jr. Leon Scott
North American Philips Corporation
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