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Proceedings Paper

Automated two-dimensional phase sensing and control using phase-contrast imaging
Author(s): William J. Cassarly; John C. Ehlert; Steve Chakmakjian; Dennis Harnesberger; J. Michael Finlan; Kevin M. Flood; Robert G. Waarts; Derek W. Nam; David F. Welch
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Paper Abstract

A method was developed for sensing the phases of a two-dimensional array of coherent sources. The method is based upon phase contrast imaging and was developed to correct the phases of individual GaAlAs emitters in a two-dimensional external cavity laser array. This paper describes the method and presents results for an 18-element linear Talbot laser cavity and for an experimentally simulated 12 x 12 array. Phase correction was achieved using a nematic liquid crystal array.

Paper Details

Date Published: 26 June 1992
PDF: 11 pages
Proc. SPIE 1634, Laser Diode Technology and Applications IV, (26 June 1992); doi: 10.1117/12.59149
Show Author Affiliations
William J. Cassarly, GE Astro Space Div. (United States)
John C. Ehlert, GE Astro Space Div. (United States)
Steve Chakmakjian, GE Astro Space Div. (United States)
Dennis Harnesberger, GE Astro Space Div. (United States)
J. Michael Finlan, LSA, Inc. (United States)
Kevin M. Flood, LSA, Inc. (United States)
Robert G. Waarts, Spectra Diode Labs., Inc. (United States)
Derek W. Nam, Spectra Diode Labs., Inc. (United States)
David F. Welch, Spectra Diode Labs., Inc. (United States)


Published in SPIE Proceedings Vol. 1634:
Laser Diode Technology and Applications IV
Daniel S. Renner, Editor(s)

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