Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1983-11-03
1988-05-31
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Optical output stabilization
372 26, 372 97, 372 37, 372 99, 372107, 372 38, 372 20, H01S 313
Patent
active
047486325
ABSTRACT:
A method and apparatus for controlling an external cavity of a semiconductor laser to maintain its emission in a single longitudinal mode. The length of the external cavity is varied by an electromagnet acting on ferromagnetic material attached to a copper foil reflector. Total optical power output of the laser is monitored and single longitudinal mode operation is achieved by maximizing the power output. An active technique employs modulation of the reflector position about a mean value. The magnetic manipulation of the reflector may find application in other laser systems, e.g. gas lasers.
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British Telecommunications PLC
Jr. Leon Scott
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