Physical Optics, Diffractive Optics

Broadband optical phased-array beam steering

[+] Author Affiliations
Paul F. McManamon

Wright-Patterson Air Force Research Laboratory,Dayton, Ohio 45433-7304

Jianru Shi

Kent State University,Liquid Crystal Institute, Kent, Ohio 44242-0001

Philip J. Bos

Kent State University,Liquid Crystal Institute, Kent, Ohio 44242-0001

Opt. Eng. 44(12), 128004 (January 04, 2006). doi:10.1117/1.2149374
History: Received March 18, 2005; Revised April 28, 2005; Accepted May 10, 2005; Published January 04, 2006
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An array of phase retarders can be used as an optical phased array (OPA) to steer light []. The introduction of resets enables steering to larger angles without requiring an optical path difference (OPD) greater than one wavelength. These resets, however, are correct only at the design wavelength. The beam steerer is therefore very dispersive. It has been shown theoretically that resets of an integer multiple of the wavelength will make the beam steerer less dispersive []. We offer the first experimental proof that resets of nλ are less dispersive than resets of a single λ. We also show experimentally that the dispersion associated with fixed period resets does vary, but only within a fixed limit. Last, we show the equivalent of power shifting from one order to the next as larger resets move from being divisible by one integer times the nondesign wavelength toward being divisible by the next integer times the nondesign wavelength.

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© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Paul F. McManamon ; Jianru Shi and Philip J. Bos
"Broadband optical phased-array beam steering", Opt. Eng. 44(12), 128004 (January 04, 2006). ; http://dx.doi.org/10.1117/1.2149374


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