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Proceedings Paper

The Effect Of An Argon Laser's Spectral Content On A Phased Array's Search For Zero Optical Path Difference
Author(s): Stephen A. Hanes
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Paper Abstract

The Air Force Weapons Laboratory phased array experiment, PHASAR, uses a multiline argon laser to phase together the output of three beam expanding telescopes. A two beam interference technique is used to compare the optical path differences (OPD) between the three telescope's beam paths. Generally, one telescope is designated as a reference and the other two telescopes are phased to it. One limitation of the system is its inability to positively identify the zero OPD point when scanning over a large range of OPDs. Due to the argon laser's limited spectral content, there are OPDs other than zero OPD where the various wavelengths are nearly back in phase, resulting in positions which are essentially indistinguishable from zero OPD. A simple procedure for determining OPDs that will be difficult to discriminate from zero OPD is described. This procedure provides a convenient means for evaluating sources for use in OPD sensors based on the two beam interference technique.

Paper Details

Date Published: 13 October 1986
PDF: 6 pages
Proc. SPIE 0643, Infrared, Adaptive, and Synthetic Aperture Optical Systems, (13 October 1986); doi: 10.1117/12.975533
Show Author Affiliations
Stephen A. Hanes, Rockwell International Corporation (United States)


Published in SPIE Proceedings Vol. 0643:
Infrared, Adaptive, and Synthetic Aperture Optical Systems
Janet S. Fender; R. Barry Johnson; William L. Wolfe, Editor(s)

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