Dr. Valiyaparambil Chacko Pretheesh Kumar Profile

Dr. Valiyaparambil Chacko Pretheesh Kumar

Research Fellow at Indian Institute of Technology Madras

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Publications (5)

SPIE Journal Paper | 31 May 2022

Shack–Hartmann wavefront sensor with enhanced dynamic range and reference-free operation

Valiyaparambil C. Pretheesh Kumar, Angarai Ganesan

OE, Vol. 61, Issue 05, 054108, (May 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.5.054108

KEYWORDS: Wavefronts, Wavefront sensors, Zernike polynomials, Optical engineering, Reconstruction algorithms, Wavefront reconstruction, MATLAB, Image processing, Sensors, Algorithms

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Proceedings Article | 15 June 2018 Paper

Effect of visibility of the fringes on the tilt measurement using a cyclic interferometer and polarization phase shifting

V. C. Pretheesh Kumar, C. Joenathan, A. Bernal, A. Ganesan

Proceedings Volume 10692, 106921F (2018) https://doi.org/10.1117/12.2311303

KEYWORDS: Interferometers, Phase shifting, Visibility, Interferometry, Polarization, Mirrors, Wave plates, Phase shifts, CCD cameras, Beam splitters

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Proceedings Article | 28 August 2016 Paper

Effect of beam quality on tilt measurement using cyclic interferometer

V. C. Pretheesh Kumar, A. Ganesan, C. Joenathan, U. Somasundaram

Proceedings Volume 9960, 99600H (2016) https://doi.org/10.1117/12.2240623

KEYWORDS: Wavefront sensors, Interferometers, Interferometry, Quality measurement, Metrology, Michelson interferometers, Monochromatic aberrations, Wavefronts, Mirrors, Beam splitters

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SPIE Journal Paper | 9 August 2016

Increasing the sensitivity for tilt measurement using a cyclic interferometer with multiple reflections

Valiyaparambil Chacko Pretheesh Kumar, Charles Joenathan, Angarai Ganesan, Umapathy Somasundram

OE, Vol. 55, Issue 08, 084103, (August 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.8.084103

KEYWORDS: Mirrors, Interferometers, Beam splitters, Reflection, Michelson interferometers, Collimation, Interferometry, Optical engineering, Wavefronts, Turbulence

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SPIE Journal Paper | 23 July 2015

Tolerance analysis of misalignment in an optical system using Shack–Hartmann wavefront sensor: experimental study

Venkataramana Kalikivayi, Valiyaparambil Chacko Pretheesh Kumar, Krithivasan Kannan, Angarai Ganesan

OE, Vol. 54, Issue 07, 075104, (July 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.7.075104

KEYWORDS: Tolerancing, Monochromatic aberrations, Wavefronts, Photovoltaics, Wavefront sensors, Optical components, Optical testing, Optical engineering, Ray tracing, Wavefront reconstruction

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