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Proceedings Paper

Effects of sinusoidal phase modulation on the signal-to-noise ratio in a digital holography system
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Paper Abstract

Digital holography (DH) has been demonstrated to be an effective wave-front sensor in low signal-to-noise ratio (SNR) environments due to the use of a strong reference. However, since DH relies on the interference of a signal with the mutually coherent reference, the coherence properties of the master-oscillator (MO) laser can degrade system SNR at long ranges. In this paper, a DH system in the off-axis image plane recording geometry was assembled and used to measure the effects of the MO coherence properties on the SNR. The coherence properties of the MO laser were degraded using sinusoidal phase modulation, which imparted maximum phase shifts of 0.38π, 0.55π, and 0.73π, at modulation frequencies of 20MHz to 100MHz. The measured coherence efficiency losses were closely predicted by the square of the fringe visibility, and deviated from the theoretical predictions by root-mean-squared errors of 0.0397, 0.0373, and 0.1007 for the three depths of modulation, respectively. The empirical data and models presented in this work may be used to assess efficiency losses in a DH system due to coherence effects.

Paper Details

Date Published: 6 September 2019
PDF: 8 pages
Proc. SPIE 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019, 111350E (6 September 2019);
Show Author Affiliations
Davin Mao, Air Force Institute of Technology (United States)
Douglas E. Thornton, Air Force Institute of Technology (United States)
Christopher A. Rice, Air Force Institute of Technology (United States)
Mark F. Spencer, Air Force Institute of Technology (United States)
Air Force Research Lab. (United States)
Glen P. Perram, Air Force Institute of Technology (United States)


Published in SPIE Proceedings Vol. 11135:
Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019
Jean J. Dolne; Mark F. Spencer; Markus E. Testorf, Editor(s)

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