Improved linear response in a modal wavefront sensor

Konwar, Santanu; Boruah, Bosanta R.

doi:10.1364/josaa.36.000741

Cited by 17 publications

(10 citation statements)

References 24 publications

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“…If large aberration amplitudes are to be measured with the same accuracy then the sensing operation is carried out in a loop, thereby lowering the sensing frame rate 35,36 . In our work, we use a recently proposed type-K modal wavefront sensor 37 to measure the multiple Zernike modes (referred to as sensor modes) present in the incident wavefront. The type-K sensor estimates the aberrations from the intensity data captured in a single camera image.…”

Section: Resultsmentioning

confidence: 99%

“…Since type-K sensor has a linear response range upto several radian of ϕ RMS for each sensor mode, corrected S K for each information frame can be obtained, after beam movement compensation, as S K (information frame) -S K (preceding reference frame). Thus, the maximum strength of the perturbation that can be compensated by the scheme is decided by the linear range provided by the type-K sensor, which can be set as per the requirement subject to the spatial resolution available in the type-K hologram 37 . More details about the perturbation compensation scheme is available in the Supplementary Note 5.…”

Section: Resultsmentioning

confidence: 99%

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Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Konwar

Boruah

2020

Commun Phys

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Free-space optical communication systems exploit the properties of light beams to transfer information through a free-space link. Indeed such systems provide an exciting alternative for communication. Here we introduce information transfer through free-space using a laser beam having its phase encoded with multiple orthogonal aberration modes. We use Zernike polynomials, which form a complete basis set, to represent the aberration modes. The user information is converted to co-efficients of the Zernike modes which are summed digitally to obtain the resultant phase profile. A single phase modulating device then reads the resultant phase to shape the wavefront of the beam to be transmitted. The receiving station estimates the co-efficients of all modes in the beam from a single measurement of a wavefront sensor, to retrieve the user information. We demonstrate data transfer using multiple modes, each with multiple strengths, and external perturbation compensation using the completeness property of the modes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Konwar

Boruah

2020

Commun Phys

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“…In general, the holographic method output characteristic is linear for a certain interval, which is determined by the values of the aberration modes, used during hologram synthesis [45,46]. Increasing the dynamic range by using the higher value of the aberration modes will decrease the accuracy of the method.…”

Section: Holographic Methods Based On a Spatial Light Modulatormentioning

confidence: 99%

Computational Method for Wavefront Sensing Based on Transport-of-Intensity Equation

et al. 2021

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Recently the transport-of-intensity equation as a phase imaging method turned out as an effective microscopy method that does not require the use of high-resolution optical systems and a priori information about the object. In this paper we propose a mathematical model that adapts the transport-of-intensity equation for the purpose of wavefront sensing of the given light wave. The analysis of the influence of the longitudinal displacement z and the step between intensity distributions measurements on the error in determining the wavefront radius of curvature of a spherical wave is carried out. The proposed method is compared with the traditional Shack–Hartmann method and the method based on computer-generated Fourier holograms. Numerical simulation showed that the proposed method allows measurement of the wavefront radius of curvature with radius of 40 mm and with accuracy of ~200 μm.

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“…If large aberration amplitudes are to be measured with the same accuracy then the sensing operation is carried out in a loop thereby lowering the sensing frame rate [5,18]. In our work we use a recently proposed type-K modal wavefront sensor [10] to measure the multiple Zernike modes (referred to as sensor modes) present in the incident wavefront. The type-K sensor estimates the aberrations from the intensity data captured in a single camera image.…”

Section: Decoding Of User Information Using the Type-k Modal Wavefron...mentioning

confidence: 99%

Steady information transfer through free-space employing orthogonal aberration mode division multiplexing

Konwar,

Boruah

2019

Preprint

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In this paper we propose and experimentally demonstrate information transfer through free-space using a laser beam encoded with multiple orthogonal aberration modes in its phase profile. We use Zernike polynomials which forms a complete set of basis functions to represent the aberration modes. The user information is encoded as amplitudes of multiple Zernike modes whose linear combination is used to define the wavefront of the laser beam in the transmission station. It therefore requires a single phase modulating device since the multiplexing is done digitally providing flexibility over the number and type of modes used. The receiving station uses a wavefront sensor that gives a direct measure of all the aberration modes from a single measurement which is decoded to retrieve the user information. The transmission mechanism enables the use of multiple modes and multiple strengths of each mode to encode the user information and external perturbation compensation, utilizing the completeness of the orthogonal modes.

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Improved linear response in a modal wavefront sensor

Cited by 17 publications

References 24 publications

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Computational Method for Wavefront Sensing Based on Transport-of-Intensity Equation

Steady information transfer through free-space employing orthogonal aberration mode division multiplexing

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