Complex-domain sparse imaging in terahertz pulse time-domain holography with balance detection

Maksim S. Kulya; Vladimir Katkovnik; Karen Egiazarian; Nikolay V. Petrov

doi:10.1117/12.2549001

2 March 2020 Complex-domain sparse imaging in terahertz pulse time-domain holography with balance detection

Maksim S. Kulya, Vladimir Katkovnik, Karen Egiazarian, Nikolay V. Petrov

Proceedings Volume 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII; 1127921 (2020) https://doi.org/10.1117/12.2549001
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Terahertz pulse time-domain holography (THz PTDH) is an ultimate technique both for the measurement of object optical properties and broadband wavefront sensing. However, THz PTDH has valuable restriction connected with low signal-to-noise ratio which becomes a serious issue in coherent measurements. This noise problem could be solved by filtering with use of modern block-matching algorithms based on nonlocal similarity of small patches of images existing in investigated objects. Here we present the study on the use of denoising algorithms applied for hyperspectral THz data in the spatio-temporal and spatial-spectral domain. We provide a numerical simulation of denoising in case of broadband uniform topologically charged (BUTCH) beam of pulsed THz radiation.

Citation Download Citation

Maksim S. Kulya, Vladimir Katkovnik, Karen Egiazarian, and Nikolay V. Petrov "Complex-domain sparse imaging in terahertz pulse time-domain holography with balance detection", Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 1127921 (2 March 2020); https://doi.org/10.1117/12.2549001

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KEYWORDS

Terahertz radiation

Denoising

Holography

Wavefronts

Algorithm development

Signal to noise ratio

Principal component analysis

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