Complex phase effects on a pulsed-source digital holography system

Steven A. Owens; Mark F. Spencer; Glen P. Perram

doi:10.1117/12.2618252

30 May 2022 Complex phase effects on a pulsed-source digital holography system

Steven A. Owens, Mark F. Spencer, Glen P. Perram

Proceedings Volume 12092, Laser Technology for Defense and Security XVII; 1209206 (2022) https://doi.org/10.1117/12.2618252
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

The signal-to-noise ratio (SNR) of a digital holography (DH) system is degraded by the total system efficiency, which is comprised of many terms. For pulsed-laser source DH systems, the total-system efficiency is dependent on the amount of temporal overlap between the signal and reference pulses. This temporal overlap not only accounts for the amplitudes of the pulses but also for the phase, which may cause degradations to the achievable SNR. A previous effort formulated a model for the effect of temporal overlap in terms of the ambiguity efficiency [Owens et. al., Appl. Opt., submitted for publication]. The outputs from the model were compared to measured results obtained using a 1064 nm pulsed-laser source DH system. Initial comparisons showed the model insufficiently accounted for one or more causes of performance degradation, leading to an over-prediction of performance. Two likely causes, mode hopping and linear frequency modulation (LFM), were investigated. It was found both could account for the over-prediction in the model, indicating the model used in the previous effort is valid.

Conference Presentation

Citation Download Citation

Steven A. Owens, Mark F. Spencer, and Glen P. Perram "Complex phase effects on a pulsed-source digital holography system", Proc. SPIE 12092, Laser Technology for Defense and Security XVII, 1209206 (30 May 2022); https://doi.org/10.1117/12.2618252

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