Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion

Peter Krause; René Berlich; Christian Vetter; Carlos A. Sevilla Gutierrez

doi:10.1117/12.2679813

19 October 2023 Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion

Peter Krause, René Berlich, Christian Vetter, Carlos A. Sevilla Gutierrez

Author Affiliations +

Proceedings Volume 12731, Environmental Effects on Light Propagation and Adaptive Systems VI; 127310J (2023) https://doi.org/10.1117/12.2679813
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Abstract

Free space optical communication (FSOC) represents a promising technology to enable a secure transmission with high data rates over long distances. Ensuring proper operation in turbulent atmospheric conditions by adaptive optics (AO) is essential for the general feasibility of FSOC. A bottle neck of the AO performance is the limited speed of control loops based on Shack-Hartmann wavefront measurements. Alternatively, holographic wavefront sensors provide the potential for an increased measurement speed by enabling a direct measurement of individual spatial mode amplitudes of the turbulence. So far, their performance is limited by inter-modal crosstalk. In this work, a design algorithm to build a holographic sensor out of a sequence of holographic plates is developed. To this end, an adapted wavefront-matching mode sorter algorithm is implemented, which is based on the use of Zernike-polynomials. The algorithm allows for designing multiple holographic phase plates in sequence with a built-in optimization of crosstalk reduction. The phase profile of the received beam is converted through interaction with each phase plate before the beam hits a detection plane. The designed computer-generated-holograms are characterized by simulation and the mitigation of crosstalk is shown for a higher number of holographic phase plates. Additionally, a proof-of-concept experiment is performed to demonstrate the desired behavior of the holographic sensor.

Conference Presentation

Citation Download Citation

Peter Krause, René Berlich, Christian Vetter, and Carlos A. Sevilla Gutierrez "Mitigation of inter-modal crosstalk in the holographic wavefront sensor through the implementation of a multi plane light conversion", Proc. SPIE 12731, Environmental Effects on Light Propagation and Adaptive Systems VI, 127310J (19 October 2023); https://doi.org/10.1117/12.2679813

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