Dr. Biswajit Pathak Profile

Dr. Biswajit Pathak

Ramanujan Fellow at Indian Institute of Space Science and Technology

SPIE Involvement:

Author

Area of Expertise:

Computer Generated Holography , Wavefront Sensors , Speckle Metrology , Diffractive Optics , Adaptive Optics , Retinal Imaging

Websites:

Personal Website | Company Website

Publications (13)

Proceedings Article | 7 October 2024 Presentation + Paper

Implementation of reference-less wavefront sensing in a grating array-based wavefront sensor

Biswajit Pathak, Jaspal Singh, C. Narayanamurthy, A. Ganesan

Proceedings Volume 13149, 131491J (2024) https://doi.org/10.1117/12.3027666

KEYWORDS: Optical gratings, Wavefronts, Wavefront sensors, Wavefront aberrations, Point spread functions, Wavefront reconstruction, Diffraction gratings, Lens arrays, Turbulence, Reconstruction algorithms

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Proceedings Article | 13 March 2024 Poster

Shack–Hartmann wavefront sensing using printed liquid crystal microlens arrays

Biswajit Pathak, Waqas Kamal, Steve Elston, Alfonso Castrejón-Pita, Martin Booth, Stephen Morris

Proceedings Volume PC12907, PC129070Q (2024) https://doi.org/10.1117/12.3007745

KEYWORDS: Microlens array, Liquid crystals, Wavefront sensors, Printing, Microlens, Lenses, Fabrication, Wavefronts, Staring arrays, Silica

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Proceedings Article | 13 March 2024 Poster + Paper

Multiplexed grating array based zonal wavefront sensor

Biswajit Pathak

Proceedings Volume 12910, 129100P (2024) https://doi.org/10.1117/12.3007752

KEYWORDS: Wavefronts, Multiplexing, Wavefront sensors, Diffraction gratings, Wavefront aberrations, Lens arrays, Spatial frequencies, Holography, Sensors

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Proceedings Article | 13 March 2024 Poster

Speckle reduction in interferometry using tuneable liquid crystal diffusers

Biswajit Pathak, Nathan Spiller, Steve Elston, Martin Booth, Stephen Morris

Proceedings Volume PC12907, PC129070R (2024) https://doi.org/10.1117/12.3007724

KEYWORDS: Speckle, Liquid crystals, Diffusers, Speckle interferometry, Laser interferometry, Vibration, Interferograms, Wave propagation interference, Turbidity, Speckle pattern

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Proceedings Article | 12 March 2024 Poster + Paper

Accurate phase reconstruction in digital holography microscopy using Fresnel biprism

Deepak Jaduvanshi, Biswajit Pathak, C. Narayanamurthy

Proceedings Volume 12852, 128520S (2024) https://doi.org/10.1117/12.3009474

KEYWORDS: Phase reconstruction, Holograms, Digital holography, Diffraction gratings, Spatial frequencies, Microscopy, Speckle, 3D image reconstruction, Red blood cells

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Proceedings Article | 4 March 2022 Presentation + Paper

Computational super-resolution imaging with multimode fiber using optimized illuminations

Biswajit Pathak, Martin Booth, Raphaël Turcotte

Proceedings Volume 11937, 1193707 (2022) https://doi.org/10.1117/12.2614642

KEYWORDS: Speckle, Super resolution, Imaging systems, Reconstruction algorithms, Image restoration, Compressive imaging, Multimode fibers

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Proceedings Article | 1 August 2021 Presentation + Paper

An improved programmable grating array based wavefront sensor

Biswajit Pathak

Proceedings Volume 11817, 118170R (2021) https://doi.org/10.1117/12.2599276

KEYWORDS: Diffraction gratings, Wavefronts, Wavefront sensors, Cameras, Diffraction

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Proceedings Article | 1 August 2021 Presentation + Paper

Simultaneous direct and indirect wavefront sensing using multiplexed programmable grating patterns

Biswajit Pathak

Proceedings Volume 11817, 118170Q (2021) https://doi.org/10.1117/12.2598361

KEYWORDS: Wavefront sensors, Wavefronts, Sensors, Multiplexing, Diffraction gratings, Holograms, Binary data, Image quality

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Proceedings Article | 18 March 2016 Paper

Binary hologram based high speed zonal wavefront sensing with reduced estimation time

Biswajit Pathak, Bosanta Boruah

Proceedings Volume 9741, 97410T (2016) https://doi.org/10.1117/12.2213986

KEYWORDS: Wavefronts, Sensors, Detector arrays, Diffraction gratings, Holograms, Adaptive optics, Temporal resolution, Computer generated holography, Transmittance, Staring arrays, Spatial frequencies

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Proceedings Article | 15 March 2016 Paper

Investigation of algorithm discretization error in a zonal wavefront estimation process

Biswajit Pathak, Bosanta Boruah

Proceedings Volume 9739, 973916 (2016) https://doi.org/10.1117/12.2213966

KEYWORDS: Discretization errors, Wavefronts, Error analysis, Wavefront sensors, Atmospheric modeling, Atmospheric propagation, Sensors, Optical aberrations, Adaptive optics, Phase imaging, Algorithm development, Reconstruction algorithms, Charge-coupled devices

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Proceedings Article | 15 June 2015 Paper

Reduction in the amount of crosstalk with reduced number of focal spot rows in a grating array based zonal wavefront sensor

Biswajit Pathak, Bosanta Boruah

Proceedings Volume 9654, 965414 (2015) https://doi.org/10.1117/12.2181713

KEYWORDS: Visual optics, Wavefront aberrations, Holograms, Adaptive optics, Fourier transforms, Binary data, Spatial frequencies, Wavefront sensors, Sensors, Wavefronts

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Proceedings Article | 6 November 2014 Paper

Analysis of error propagation in an improved zonal phase-gradient model

Biswajit Pathak, Bosanta Boruah

Proceedings Volume 9272, 92721Y (2014) https://doi.org/10.1117/12.2072302

KEYWORDS: Wavefronts, Wave propagation, Error analysis, Wavefront sensors, Sensors, Reconstruction algorithms, Wavefront reconstruction, CCD image sensors, Charge-coupled devices, Visual optics

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Proceedings Article | 26 November 2012 Paper

High-speed zonal wavefront sensing

Biswajit Pathak, Abhijit Das, Bosanta Boruah

Proceedings Volume 8557, 85570A (2012) https://doi.org/10.1117/12.999893

KEYWORDS: Wavefront sensors, Wavefronts, Binary data, Cameras, Holograms, Sensors, Lenses, Monochromatic aberrations, Digital cameras, Spatial frequencies

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Showing 5 of 13 publications

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