Simulation-based design optimization of the holographic wavefront sensor in closed-loop adaptive optics

Zepp, Andreas; Gładysz, Szymon; Stein, Karin

doi:10.37188/lam.2022.027

Cited by 9 publications

(7 citation statements)

References 48 publications

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“…After obtaining the data in one position, the angle of the spectral grating was rotated to obtain circumferential sampling. By cross-comparison with data from the initial position, we ensured that the curvature radius and relative alignment of the optical element satisfied the requirements [ 20 , 21 , 22 ]. Various optical systems could be sequentially measured and their optical axes could be aligned using a mobile mechanism.…”

Section: Experimental Verificationmentioning

confidence: 99%

Photonics Scanning Pentaprism System for the Integrated Inspection of Large-Aperture Telescopes

Zhang

Wang

et al. 2023

Sensors

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To improve their spatial resolution and detection capabilities, future ground-based optical telescopes will have a size of 30 m, and the aperture of space telescopes will be increased to 10 m. Such large optical systems necessitate the development of large integrated testing equipment. In this study, spectrum and system alignment measurements and wavefront quality checking were performed using the sub-aperture detection method and a fiber-connected Photonics Scanning Pentaprism (PSP). First, the system was aligned using an optical truss, ensuring that the optical axis was properly positioned. Second, using a sub-aperture light beam though the entrance pupil, light spots were formed on the focal plane and transmitted to the spectrometer via fibers to obtain the corresponding spectral components. Then, by taking measurements at different system positions, a full-aperture spectrum response could be reached. Lastly, by photon-integrated interference on the focal plane, intensity interference fringes could be projected at the entrance pupil of the system. And the wavefront quality of the system could be verified by observing the fringe deformation. The measurement accuracy of the optical axis of the system is better than 2 mrad. The spectral measurement accuracy was better than 5%, and the wavefront measurement accuracy surpassed 0.1 wavelengths (1 wavelength = 633 nm). This study effectively enhanced the detection and in situ calibration capabilities of large telescope systems, ensuring that the performance requirements can be met in the design of future telescopes.

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Section: Experimental Verificationmentioning

confidence: 99%

Photonics Scanning Pentaprism System for the Integrated Inspection of Large-Aperture Telescopes

Zhang

Wang

et al. 2023

Sensors

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“…3 and is still a common problem. 5 Especially for higher order modes present in a wavefront crosstalk occurs. 5 The required multiplexing is adding to the effect as well.…”

Section: Modal Holographic Wavefront Measurementmentioning

confidence: 99%

“…5 Especially for higher order modes present in a wavefront crosstalk occurs. 5 The required multiplexing is adding to the effect as well. As parts of the incoming wavefront are diffracted into the diffraction orders of different holograms which are part of the multiplex.…”

Section: Modal Holographic Wavefront Measurementmentioning

confidence: 99%

“…Among the possible solutions are including measured crosstalk components into the sensor calibration, optimizing key parameters of the sensor or switching to a different modal basis. 5 We propose using a multi plane light conversion method with multiple phase plates separated by free space to reduce crosstalk. The goal is to distribute the needed conversion from input Zernike to output tilt over multiple plates and their respective propagational distance in between.…”

Section: Modal Holographic Wavefront Measurementmentioning

confidence: 99%

“…4 Regardless of different approaches to realizing the holographic sensor, it suffers a great deal from the persisting problem of inter-modal crosstalk. 5 This crosstalk is the result of the influence of all present input wavefront aberration modes on one single sensor mode in the measurement, leading to noise in the readout of the sensor channels.…”

Section: Introductionmentioning

confidence: 99%

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

Krause,

Berlich,

Vetter

et al. 2023

Environmental Effects on Light Propagation and Adaptive Systems VI

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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.

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Dynamic Analysis on Impact of Aero-Optics Under Dynamic Conjoint Supersonic Boundary Conditions

Wang,

Chen

et al. 2023

IECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society

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Simulation-based design optimization of the holographic wavefront sensor in closed-loop adaptive optics

Cited by 9 publications

References 48 publications

Photonics Scanning Pentaprism System for the Integrated Inspection of Large-Aperture Telescopes

Photonics Scanning Pentaprism System for the Integrated Inspection of Large-Aperture Telescopes

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

Dynamic Analysis on Impact of Aero-Optics Under Dynamic Conjoint Supersonic Boundary Conditions

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