Ms. Upendra H. Manyam Profile

Upendra H. Manyam

at Coherent | Nufern

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Publications (10)

Proceedings Article | 21 November 2017 Open Access

Performance of optical fibers in space radiation environment

M. Alam, J. Abramczyk, U. Manyam, J. Farroni, D. Guertin

Proceedings Volume 10567, 105672M (2017) https://doi.org/10.1117/12.2308184

KEYWORDS: Optical fibers, Signal attenuation, Satellites, Multimode fibers, Phase modulation, Gamma radiation, Astronomical imaging, Optics manufacturing, Temperature metrology, Manufacturing

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Proceedings Article | 30 August 2006 Paper

Passive and active optical fibers for space and terrestrial applications

Mansoor Alam, Jaroslaw Abramczyk, Julia Farroni, Upendra Manyam, Douglas Guertin

Proceedings Volume 6308, 630808 (2006) https://doi.org/10.1117/12.678087

KEYWORDS: Signal attenuation, Satellites, Data modeling, Optical fibers, Silica, Gamma radiation, Multimode fibers, Phase modulation, Temperature metrology, Telecommunications

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Proceedings Article | 23 February 2006 Paper

New developments in high power eye-safe LMA fibers

K. Tankala, B. Samson, A. Carter, J. Farroni, D. Machewirth, N. Jacobson, U. Manyam, A. Sanchez, M-Y. Chen, A. Galvanauskas, W. Torruellas, Y. Chen

Proceedings Volume 6102, 610206 (2006) https://doi.org/10.1117/12.646663

KEYWORDS: Thulium, Optical fibers, Absorption, Ytterbium, Erbium, Cladding, Ions, Silica, Quantum efficiency, Glasses

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Proceedings Article | 22 April 2005 Paper

Linearly polarized high-power fiber lasers with monolithic PM-LMA-fiber and LMA-grating based cavities and their use for nonlinear wavelength conversion

V. Khitrov, B. Samson, U. Manyam, K. Tankala, D. Machewirth, S. Heinemann, C. Liu, A. Galvanauskas

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.590825

KEYWORDS: Fiber lasers, Polarization, Fiber Bragg gratings, High power fiber lasers, Continuous wave operation, Diffraction, Laser resonators, Chemical oxygen iodine lasers, Diodes, Laser applications

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Proceedings Article | 21 February 2005 Paper

Damage mechanisms in components for fiber lasers and amplifiers

Adrian Carter, Bryce Samson, Kanishka Tankala, David Machewirth, Victor Khitrov, Upendra Manyam, Francois Gonthier, Francois Seguin

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.592015

KEYWORDS: Fiber lasers, Cladding, Coating, Glasses, Reliability, Polymers, Fiber Bragg gratings, Interfaces, Continuous wave operation, Fiber coupled lasers

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Proceedings Article | 8 October 2004 Paper

Continued advancements in the design of double clad fibers for use in high output fiber lasers and amplifiers

Adrian Carter, Kanishka Tankala, Bryce Samson, David Machewirth, Victor Khitrov, Upendra Manyam

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596360

KEYWORDS: Optical fibers, Fiber lasers, Birefringence, Fiber amplifiers, Polarization, Cladding, Phase modulation, Ytterbium, Single mode fibers, Nonlinear dynamics

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Fiber lasers have a number of distinct advantages over their more conventional solid state laser alternatives. These advantages include size, reliability, wavelength selectivity, heat dissipation, wall plug efficiency and operational cost. Furthermore they can be operated without the need for active cooling or optical alignment. Consequently the market for these more traditional laser sources are beginning to be eroded by the emergence of fiber lasers. In 1999 high power fiber lasers became a reality, with the world's first single-mode fiber laser exhibiting in excess of 100W cw output. However it was soon recognized that conventional small core, high NA fiber designs were not appropriate to applications requiring further scaling of the output power. More specifically it was found that the maximum achievable output power in such fibers were restricted by a fundamental susceptibility to optical nonlinearities, including stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS) and self-phase modulation. In order to overcome the limitations imposed by these parasitic nonlinear processes, it has been necessary to develop fibers with high rare-earth dopant concentrations in relatively large core, low numerical aperture fibers. These so-called large mode area (LMA) fibers are directly responsible for the recent explosion in demonstrated diffraction-limited beam quality output powers, now approaching the kW-level from a single fiber. To further scale the output power it is necessary to combine the output of several fiber lasers. Indeed, for a number of industrial and military applications it is desirable to scale the total output power to between several and hundreds of kW's. It is therefore advantageous to be able to coherently combine the beams from multiple fibers and this it turns makes it desirable for the fiber to also be polarization maintaining. This provides yet another layer of complexity to the fiber design but such fibers are now a commercial reality. In this paper we review the recent and ongoing advantages in fiber design that is facilitating the development and production of lasers and amplifiers with ever increasing output powers.

Proceedings Article | 14 June 2004 Paper

The road to kilowatt fiber lasers

Adrian Carter, Bryce Samson, Kanishka Tankala, David Machewirth, Upendra Manyam, Jaroslaw Abramczyk, Julia Farroni, Douglas Guertin, Nils Jacobson

Proceedings Volume 5350, (2004) https://doi.org/10.1117/12.533134

KEYWORDS: Fiber lasers, Birefringence, Cladding, Phase modulation, Glasses, Manufacturing, Diodes, Ytterbium, Fiber coupled lasers, Roads

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Proceedings Article | 7 June 2004 Paper

Large-mode-area double-clad fibers for pulsed and CW lasers and amplifiers

David Machewirth, Victor Khitrov, Upendra Manyam, Kanishka Tankala, Adrian Carter, Jaroslaw Abramczyk, Julia Farroni, Douglas Guertin, Nils Jacobson

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.528056

KEYWORDS: Optical fibers, Ytterbium, Cladding, Phase modulation, Amplifiers, Absorption, Fiber lasers, Reliability, Optical testing, Chemical oxygen iodine lasers

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Proceedings Article | 3 July 2003 Paper

PM double-clad fibers for high-power lasers and amplifiers

Kanishka Tankala, Adrian Carter, David Machewirth, Julia Farroni, Jaroslaw Abramczyk, Upendra Manyam

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.501679

KEYWORDS: Optical fibers, Birefringence, Phase modulation, Amplifiers, High power lasers, Cladding, Polarization, Luminescence, Ytterbium, Fiber lasers

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Proceedings Article | 23 February 1999 Paper

Complete spectrum fiber optic pH sensor based on a novel fluorescent indicator doped porous sol-gel material

U. Manyam, Mahmoud Shahriari, Michael Morris

Proceedings Volume 3540, (1999) https://doi.org/10.1117/12.339789

KEYWORDS: Luminescence, Sensors, Fiber optics sensors, Sol-gels, Absorption, Fiber optics, Spectrophotometry, Light sources, Optical coatings, Light emitting diodes

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Showing 5 of 10 publications

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