Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1995-10-26
1998-10-27
Bovernick, Rodney B.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 29, 372 32, 372 36, 372102, H01S 308, H01S 313, H01S 304
Patent
active
058286888
ABSTRACT:
The linewidth of a distributed feedback semiconductor laser or a distributed Bragg reflector laser having one or more second order gratings is reduced by using an external cavity to couple the vertical emission back into the laser. This method and device prevent disturbance of the main laser beam, provide unobstructed access to laser emission for the formation of the external cavity, and do not require a very narrow heat sink. Any distributed Bragg reflector semiconductor laser or distributed feedback semiconductor laser that can produce a vertical emission through the epitaxial material and through a window in the top metallization can be used. The external cavity can be formed with an optical fiber or with a lens and a mirror or grating.
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Cook Anthony L.
Hendricks Herbert D.
Bovernick Rodney B.
Edwards Robin W.
Leung Quyen Phan
The United States of America as represented by the Administrator
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