Correction quality criterion for DOPC guide-stars

John Boehm; David Krause; Nektarios Koukourakis; Juergen W. Czarske

doi:10.1117/12.3016732

18 June 2024 Correction quality criterion for DOPC guide-stars

John Boehm, David Krause, Nektarios Koukourakis, Juergen W. Czarske

Proceedings Volume 12996, Unconventional Optical Imaging IV; 129960F (2024) https://doi.org/10.1117/12.3016732
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Optical imaging and beam delivery deep into biological tissue is a great challenge due to strong light scattering. It has been shown in the last years that wavefront shaping employing a digital spatial light modulator (SLM) has the power to exploit the scattered light to enhance the penetration depth. Typically, a guide star emitting a known wavefront is required to probe scattering events and determine the necessary mask to be displayed. The resulting Peak-to-Background Ratio (PBR) is commonly used as a quality measure for the Digital Optical Phase Conjugation (DOPC) procedure. Here, we introduce a new correction quality criterion to evaluate the measured phase mask. By placing the SLM into the object beam, it is possible to manipulate the phase measurement. By first measuring the required mask and then exposing a second hologram with the conjugated measured phase displayed on the SLM, we can cancel out the distortion. We demonstrate that this cancellation can be observed in the angular spectrum of the hologram, enabling evaluation of the mask without considering any playback properties. Furthermore, it corresponds to better playback efficiency.

Conference Presentation

Citation Download Citation

John Boehm, David Krause, Nektarios Koukourakis, and Juergen W. Czarske "Correction quality criterion for DOPC guide-stars", Proc. SPIE 12996, Unconventional Optical Imaging IV, 129960F (18 June 2024); https://doi.org/10.1117/12.3016732

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