Automated two-dimensional phase sensing and control using phase-contrast imaging

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

doi:10.1117/12.59149

26 June 1992 Automated two-dimensional phase sensing and control using phase contrast imaging

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

Author Affiliations +

Proceedings Volume 1634, Laser Diode Technology and Applications IV; (1992) https://doi.org/10.1117/12.59149
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

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.

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William J. Cassarly, John C. Ehlert, Steve Chakmakjian, Dennis Harnesberger, J. Michael Finlan, Kevin M. Flood, Robert G. Waarts, Derek W. Nam, and David F. Welch "Automated two-dimensional phase sensing and control using phase contrast imaging", Proc. SPIE 1634, Laser Diode Technology and Applications IV, (26 June 1992); https://doi.org/10.1117/12.59149

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