scholarly journals Optical detection of values of separate aberrations using a multi-channel filter matched with phase Zernike functions

2021 ◽  
Vol 45 (4) ◽  
pp. 525-533
Author(s):  
P.A. Khorin ◽  
S.G. Volotovskiy ◽  
S.N. Khonina
Keyword(s):  
Numerical Simulation ◽  
Spatial Light Modulator ◽  
Optical Detection ◽  
Diffraction Order ◽  
Maximum Intensity ◽  
Wavefront Sensor ◽  
Light Modulator ◽  
Correlation Peak ◽  
Wavefront Aberrations ◽  
Channel Filter

The use of a multichannel wavefront sensor matched with phase Zernike functions to determine the type and magnitude of aberration in the analyzed wavefront is investigated. The approach is based on stepwise compensation of wavefront aberrations based on a dynamically tunable spatial light modulator. As criteria for successful detection, not only the magnitude of the correlation peak, but also the maximum intensity, compactness, and orientation of the distribution in each diffraction order are considered. On the basis of numerical simulation, the efficiency of the proposed approach is shown for detecting both weak and strong (up to a wavelength) wavefront aberrations.

scholarly journals Optical detection of values of separate aberrations using a multi-channel filter matched with phase Zernike functions

2021 ◽  
Vol 45 (4) ◽  
pp. 525-533
Author(s):  
P.A. Khorin ◽  
S.G. Volotovskiy ◽  
S.N. Khonina
Keyword(s):  
Numerical Simulation ◽  
Spatial Light Modulator ◽  
Optical Detection ◽  
Diffraction Order ◽  
Maximum Intensity ◽  
Wavefront Sensor ◽  
Light Modulator ◽  
Correlation Peak ◽  
Wavefront Aberrations ◽  
Channel Filter

The use of a multichannel wavefront sensor matched with phase Zernike functions to determine the type and magnitude of aberration in the analyzed wavefront is investigated. The approach is based on stepwise compensation of wavefront aberrations based on a dynamically tunable spatial light modulator. As criteria for successful detection, not only the magnitude of the correlation peak, but also the maximum intensity, compactness, and orientation of the distribution in each diffraction order are considered. On the basis of numerical simulation, the efficiency of the proposed approach is shown for detecting both weak and strong (up to a wavelength) wavefront aberrations.

scholarly journals Generation of Optical Vortices by Linear Phase Ramps

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Sunil Vyas
Keyword(s):  
Numerical Simulation ◽  
Intensity Distribution ◽  
Spatial Light Modulator ◽  
Phase Mask ◽  
Computational Techniques ◽  
Optical Vortices ◽  
Vortex Generation ◽  
Linear Phase ◽  
Light Modulator ◽  
Phase Discontinuity

Generation of optical vortices using linear phase ramps is experimentally demonstrated. When two regions of a wavefront have opposite phase gradients then along the line of phase discontinuity vortices can be generated. It is shown that vortices can evolve during propagation even with the unequal magnitude of tilt in the two regions of the wavefront. The number of vortices and their location depend upon the magnitude of tilt. vortex generation is experimentally realized by encoding phase mask on spatial light modulator and their presence is detected interferometrically. Numerical simulation has been performed to calculate the diffracted intensity distribution from the phase mask, and presence of vortices in the diffracted field is detected by computational techniques.

scholarly journals Аппаратно-алгоритмическое обеспечение корреляционного детектирования в голографических датчиках волнового фронта

2019 ◽  
Vol 127 (10) ◽  
pp. 563
Author(s):  
П.А. Ручка ◽  
Н.М. Вереникина ◽  
И.В. Гриценко ◽  
Е.Ю. Злоказов ◽  
М.С. Ковалев ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Wavefront Sensor ◽  
Practical Implementation ◽  
Light Modulator

AbstractAn algorithm that automatically calculates aberrations in the holographic wavefront sensor scheme previously proposed by the authors is described, which enables measuring aberrations by means of iterative generation of holograms on a phase spatial light modulator (SLM). The practical implementation of this algorithm on the basis of the feedback of the camera and SLM is given. Using the proposed algorithm, defocusing was measured with an accuracy of λ/160.

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