Dr. Om Prakash Profile

Dr. Om Prakash

Scientist at Raja Ramanna Ctr for Advanced Technology

SPIE Involvement:

Author

Publications (16)

Proceedings Article | 20 February 2020 Presentation + Paper

Sensitivity analysis of TiO2 coated fibre Bragg grating sensor for far infrared detection of chemicals

Sanjeev Kumar Raghuwanshi, Yadvendra Singh, Azhar Shadab, Purnendu Shekhar Pandey, Om Prakash, Pankaj Kumar Saini

Proceedings Volume 11233, 1123306 (2020) https://doi.org/10.1117/12.2542908

KEYWORDS: Fiber Bragg gratings, Bioalcohols, Information operations, Sensors, Chemical analysis, Refractive index, Etching, Head, Cladding, Far infrared

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SPIE Journal Paper | 31 May 2019

Effect of gamma radiation dose on the performance of negative-index fiber Bragg gratings

Jitendra Kumar, Om Prakash, Sudhir Kumar, Sudhir K. Dixit, Yatender Bhardwaj, Shankar Nakhe

OE, Vol. 58, Issue 05, 057108, (May 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.5.057108

KEYWORDS: Fiber Bragg gratings, Refractive index, Radiation effects, Gamma radiation, Temperature metrology, Ultraviolet radiation, Modulation, Reflectivity, Sensors, Annealing

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SPIE Journal Paper | 6 September 2016

Distributed fiber Bragg grating sensor for multipoint temperature monitoring up to 500°C in high-electromagnetic interference environment

Jitendra Kumar, Om Prakash, Sachin Kumar Agrawal, Ramakanta Mahakud, Anagha Mokhariwale, Sudhir Dixit, Shankar Nakhe

OE, Vol. 55, Issue 09, 090502, (September 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.9.090502

KEYWORDS: Fiber Bragg gratings, Temperature metrology, Sensors, Environmental sensing, Temperature sensors, Environmental monitoring, Electromagnetic coupling, Ultraviolet radiation, Laser development, Fiber lasers

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SPIE Journal Paper | 6 November 2014

On the role of Ge-doping concentration in the refractive index rollover and thermal annealing characteristics of type IIa fiber Bragg gratings

Jitendra Kumar, Om Prakash, Ramakant Mahakud, Sachin Kumar Agrawal, Sudhir Dixit, Shankar Nakhe

OE, Vol. 53, Issue 11, 117103, (November 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.11.117103

KEYWORDS: Fiber Bragg gratings, Refractive index, Ultraviolet radiation, Reflectivity, Modulation, Annealing, Temperature metrology, Absorption, Optical fibers, Optical engineering

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SPIE Journal Paper | 15 July 2013

Analysis of ultraviolet fringes contrast on first and second order Fiber Bragg gratings written by prism interferometers

Ramakant Mahakud, Jitendra Kumar, Om Prakash, Sudhir Dixit

OE, Vol. 52, Issue 07, 076114, (July 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.7.076114

KEYWORDS: Fiber Bragg gratings, Ultraviolet radiation, Prisms, Refractive index, Interferometers, Reflectivity, Modulation, Wavefronts, Optical simulations, Optical engineering

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SPIE Journal Paper | 7 May 2013

Study on hydrofluoric acid-based clad etching and chemical sensing characteristics of fiber Bragg gratings of different reflectivity fabricated under different UV exposure times

Jitendra Kumar, Ramakant Mahakud, Om Prakash, Sudhir Dixit

OE, Vol. 52, Issue 05, 054402, (May 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.5.054402

KEYWORDS: Fiber Bragg gratings, Etching, Cladding, Refractive index, Reflectivity, Ultraviolet radiation, Biological and chemical sensing, Bioalcohols, Silica, Wet etching

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Proceedings Article | 15 March 2013 Paper

Spatial coherence of low-cost 532nm green lasers

Dimo Astadjov, Om Prakash

Proceedings Volume 8770, 87701P (2013) https://doi.org/10.1117/12.2012849

KEYWORDS: Spatial coherence, Interferometers, Laser sources, Power supplies, Interferometry, Semiconductor lasers, Mirrors, Laser damage threshold, Diode pumped solid state lasers, Neodymium lasers

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Proceedings Article | 15 March 2013 Paper

Experimental verification of focusability of coherent annular laser beams

Dimo Astadjov, Om Prakash

Proceedings Volume 8770, 87701O (2013) https://doi.org/10.1117/12.2012473

KEYWORDS: Optical simulations, Near field optics, Fourier transforms, Copper vapor lasers, Beam shaping, Far-field diffraction, CCD cameras, Metal vapor lasers, Solid state physics, Laser systems engineering

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SPIE Journal Paper | 1 November 2011

Comparative study on second harmonic conversion and saturation characteristics of three copper vapor laser beams of same average power and different spatial coherence

Om Prakash, Ramakant Mahakud, Sudhir Dixit

OE, Vol. 50, Issue 11, 114201, (November 2011) https://doi.org/10.1117/12.10.1117/1.3644551

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SPIE Journal Paper | 1 August 2011

A comparative study on thermal lensing characteristics of low (∼500 °C) and high (∼1500 °C) temperature variants of copper vapor laser

Ramakanta Biswal, Govind Mishra, Girija Purbia, Pravin Agrawal, Om Prakash, Sudhir Dixit, Jeevan Mittal

OE, Vol. 50, Issue 08, 084202, (August 2011) https://doi.org/10.1117/12.10.1117/1.3609799

KEYWORDS: Copper vapor lasers, Refractive index, Silica, Laser applications, Copper, Optical engineering, Helium neon lasers, Absorption, Hydrogen

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SPIE Journal Paper | 1 May 2006

Cylindrical-lens-based wavefront-reversing shear interferometer for the spatial coherence measurement of UV radiations

Om Prakash, Ramakant Mahakud, H. Vora, S. Dixit

OE, Vol. 45, Issue 05, 055601, (May 2006) https://doi.org/10.1117/12.10.1117/1.2205847

KEYWORDS: Interferometers, Wavefronts, Spatial coherence, Ultraviolet radiation, Mirrors, Optical components, Beam splitters, Visibility, Optical engineering, Resonators

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SPIE Journal Paper | 1 February 2006

Effect of buffer gas pressure on the spatiotemporal evolution of small-signal gain in copper vapor laser

Ramakant Mahakud, Om Prakash, R. Biswal, S. Dixit

OE, Vol. 45, Issue 02, 024201, (February 2006) https://doi.org/10.1117/12.10.1117/1.2172173

KEYWORDS: Neon, Optical amplifiers, Picosecond phenomena, Copper vapor lasers, Oscillators, Amplifiers, Optical engineering, Pulsed laser operation, Plasma, Skin

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Proceedings Article | 23 March 2005 Paper

Filtering resonators copper vapor laser

S. Dixit, Om Prakash

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611241

KEYWORDS: Resonators, Mirrors, Optical filters, Spatial coherence, Copper vapor lasers, Diffraction, Confocal microscopy, Pulsed laser operation, Laser resonators, Spatial filters

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Proceedings Article | 5 September 2002 Paper

Comparison of uncertainties in the measurement of focal length of convex lens using nodal point and magnification methods

Om Prakash

Proceedings Volume 4921, (2002) https://doi.org/10.1117/12.481749

KEYWORDS: Microscopes, Collimators, Optical benches, Measurement devices, Interferometers, CCD cameras, Optical tracking, Image processing, Standards development, Roads

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Proceedings Article | 14 April 1999 Paper

Simple device to measure laser mirror parameters

Om Prakash

Proceedings Volume 3626, (1999) https://doi.org/10.1117/12.345439

KEYWORDS: Mirrors, Laser scattering, Beam splitters, Integrating spheres, Reflectivity, Transmittance, Scattering, Optical spheres, Signal detection, Photodetectors

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Proceedings Article | 1 September 1996 Paper

Simple design to measure the scattering factor of laser mirrors

Om Prakash

Proceedings Volume 2778, 277851 (1996) https://doi.org/10.1117/12.2299064

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Showing 5 of 16 publications

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