Instrumentation, Techniques, and Measurement

Snapshot spectrally resolved longitudinal spatial coherence interferometry

[+] Author Affiliations
Ethan R. Woodard, Michael W. Kudenov

North Carolina State University, Department of Electrical and Computer Engineering, Raleigh, North Carolina, United States

Opt. Eng. 56(6), 064104 (Jun 21, 2017). doi:10.1117/1.OE.56.6.064104
History: Received March 24, 2017; Accepted June 1, 2017
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Abstract.  We present a one-dimensional (1-D) imaging technique that uses longitudinal spatial coherence interferometry to encode a scene’s spatial information onto the source’s power spectrum. By spectrally resolving the output using a spectrometer, a channeled spectrum is measured. Fourier transformation of the channeled spectrum yields a measurement of the incident scene’s angular spectrum. The theory is presented to exhibit analogies to conventional Fourier transform spectroscopy of the power spectrum. Experimental validation of the technique is demonstrated, using a Fabry–Perot etalon, for the reconstruction of 1-D sinusoidal and randomly generated angular spectra. Root mean square error between the input and output angular spectra is demonstrated, on average, to be 12.7% and 13.6% for single-frequency and random spectra, respectively.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Ethan R. Woodard and Michael W. Kudenov
"Snapshot spectrally resolved longitudinal spatial coherence interferometry", Opt. Eng. 56(6), 064104 (Jun 21, 2017). ; http://dx.doi.org/10.1117/1.OE.56.6.064104


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