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Using a pulsed configuration, a digital-holographic system is setup in the off-axis image plane recording geometry, and spectral broadening via pseudo-random bit sequence is used to degrade the temporal coherence of the master-oscillator laser. The associated effects on the signal-to-noise ratio are then measured in terms of the ambiguity and coherence efficiencies. It is found that the ambiguity efficiency, which is a function of signal-reference pulse overlap, is not affected by the effects of spectral broadening. The coherence efficiency, on the other hand, is affected. As a result, the coherence efficiency, which is a function of effective fringe visibility, is shown to be a valid performance metric for pulsed-source digital holography.


This article appears in volume 59 of IEEE Journal of Quantum Electronics.

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The article is shared in accordance with the guidance posted at Sherpa. https://beta.sherpa.ac.uk/publication/3562, [Published version with CC BY]

Author note: Mark Spencer is co-affiliated with AFIT and the Air Force Research Laboratory's Directed Energy Directorate.

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IEEE Journal of Quantum Electronics