Coherent light generators – Particular active media – Semiconductor
Patent
1992-08-10
1994-10-04
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 46, 372 97, H01S 319
Patent
active
053532953
ABSTRACT:
In a form of the disclosure an array of coupled cavities (called minicavities) of a QWH semiconductor laser are defined by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. The native oxide confines the injected carriers and optical field within the cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe. Single-longitudinal-mode operation is exhibited over an extended range. In a further form of the disclosure, two linear arrays of end-coupled minicavities are arranged side by side to obtain a two dimensional array, with resultant lateral coupling between the linear arrays. The two dimensional array exhibits mode switching and multiple switching in the light power (L) versus current (I) characteristic (L-I) with increasing current. In another form of the disclosure, a stripe laser is transversely coupled (or side-coupled) with a linear array of end-coupled minicavities. Bistability and switching are demonstrated in the light versus current (L-I) characteristic of a native-oxide-defined structure of this type. The device, with internally coupled elements and the current partitioned among the elements, exhibits a large hysteresis in the L-I curve, with switching from the stimulated to the spontaneous regime occurring over substantial power (light) and current ranges.
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El-Zein Nada
Holonyak, Jr. Nick
Kish Fred A.
Davie James W.
Novack Martin M.
The Board of Trustees of the University of Illinois
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