The effect of an argon laser's spectral content on a phased array's search for zero optical path difference

Details The effect of an argon laser's spectral content on a phased array's search for zero optical path difference The effect of an argon laser's spectral content on a phased array's search for zero optical path difference

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..643..228h&link_type=abstract

IN: Infrared, adaptive, and synthetic aperture optical systems; Proceedings of the Meetings, Arlington, VA, Apr. 8, 1985 and Orl

Other

Argon Lasers, Optical Paths, Phased Arrays, Telescopes, Diffraction Patterns, Signal Processing, Spectrum Analysis

Scientific paper

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 telescopes' 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.

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