Narrowing the far field of a Y-junction laser array using a customized spatial filter in an external cavity

Berger, Josef; Welch, David F.; Streifer, William; Scifres, Donald R.
May 1988
Applied Physics Letters;5/9/1988, Vol. 52 Issue 19, p1560
Academic Journal
A study of the spatially resolved spectrum of individual emitters in a Y-junction laser array shows that the array is not completely locked. The use of an external cavity with a novel, customized spatial filter is demonstrated to yield a stable output beam, which increases from 1.25 times the diffraction limit at low power to 1.6 times the diffraction limit at 120 mW without shifting.


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