Prof. Jayanta K. Sahu Profile

Prof. Jayanta K. Sahu

Professor at Univ of Southampton

SPIE Involvement:

Author | Editor

Publications (51)

Proceedings Article | 13 March 2024 Presentation

Mode rejection and counter-propagating all-optical gratings in multimode waveguides

Kunhao Ji, Ian Davidson, Jayanta Sahu, David Richardson, Stefan Wabnitz, Massimiliano Guasoni

Proceedings Volume PC12871, PC128710H (2024) https://doi.org/10.1117/12.2692091

KEYWORDS: Solitons, Waveguides, Optical gratings, Beam controllers, Polarization, Optical fibers, Multicore fiber, Polarization gratings, Photonics, Photonic integrated circuits

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Proceedings Article | 1 November 2021 Paper

Amplified O-band direct-detection transmission using bismuth-doped fiber amplifiers

Yang Hong, Kyle R. Bottrill, Natsupa Taengnoi, Naresh Thipparapu, Yu Wang, Jayanta Sahu, David Richardson, Periklis Petropoulos

Proceedings Volume 12057, 120572Y (2021) https://doi.org/10.1117/12.2606135

KEYWORDS: Fiber amplifiers, Optical amplifiers, Coarse wavelength division multiplexing, Single sideband modulation, Modulation, Double sideband modulation, Semiconductor optical amplifiers, Wavelength division multiplexing

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Proceedings Article | 5 October 2020 Presentation

Advances in doped optical fibre 2.0

Jayanta Sahu

Proceedings Volume 11580, 1158008 (2020) https://doi.org/10.1117/12.2584857

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Proceedings Article | 1 April 2020 Presentation

Cladding shaping of optical fiber preforms via CO2 laser machining (Conference Presentation)

Peter Shardlow, Robert Standish, Martin Velazquez, Jayanta Sahu, Andy Clarkson

Proceedings Volume 11355, 113550A (2020) https://doi.org/10.1117/12.2556685

KEYWORDS: Cladding, Carbon dioxide lasers, Optical fibers, Surface finishing, Silica, Polishing, High power lasers, Ion lasers, Ions, Refractive index

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Proceedings Article | 11 March 2020 Presentation

Cladding-pumped nested-ring Tm fiber laser with 131 W single-mode output at 1907 nm (Conference Presentation)

Matthew Barber, Peter Shardlow, Pranabesh Barua, Jayanta Sahu, Andy Clarkson

Proceedings Volume 11260, 112600F (2020) https://doi.org/10.1117/12.2544414

KEYWORDS: Thulium, Fiber lasers, Optical pumping, Photons, Glasses, Defense and security, Medicine, Materials processing

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Proceedings Article | 11 March 2020 Presentation

47-W 1726-nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser (Conference Presentation)

Mark Burns, Peter Shardlow, Pranabesh Barua, Thomas Jefferson-Brain, Jayanta Sahu, William Clarkson

Proceedings Volume 11260, 112600G (2020) https://doi.org/10.1117/12.2544933

KEYWORDS: Fiber lasers, YAG lasers, Absorption, Ytterbium, Polymers, Laser therapeutics, Laser development, High power lasers, Laser sources, Laser systems engineering

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Proceedings Article | 2 March 2020 Paper

Optical fibers fabricated from 3D printed silica preforms

Angeles Camacho Rosales, Martin M. Núñez Velázquez, Xiao Zhao, Jayanta Sahu

Proceedings Volume 11271, 112710U (2020) https://doi.org/10.1117/12.2543210

KEYWORDS: Silica, Optical fibers, Laser sintering, 3D printing, Glasses, Additive manufacturing, Particles, Printing, Structured optical fibers

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Proceedings Article | 21 February 2020 Paper

Efficient cladding pump Tm:Ho co-doped fiber laser for operation in the 2.1 microns region

Norberto Ramírez Martínez, Martín M. Núñez Velázquez, Jayanta Sahu

Proceedings Volume 11260, 112600H (2020) https://doi.org/10.1117/12.2546007

KEYWORDS: Fiber lasers, Thulium, Cladding, Holmium, Absorption, Semiconductor lasers, Ions, Aluminum, Diodes, Fabrication

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Proceedings Article | 18 February 2020 Paper

Enhancing the nonlinear functionality of step-index silica fibers through the combination of thermal poling and 2D materials

F. De Lucia, A. Lewis, R. H. Bannerman, N. Englebert, M. M. Nunez Velazquez, C.-C. Huang, J. Gates, S.-P. Gorza, J. Sahu, F. Leo, D. Hewak, P. J. Sazio

Proceedings Volume 11282, 1128212 (2020) https://doi.org/10.1117/12.2544140

KEYWORDS: Optical fibers, Cladding, Silica, Glasses, Molybdenum, Electrodes, Thermal effects, Nonlinear optics, Raman spectroscopy, Transition metals

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Thermal poling, a technique to create permanently effective second-order susceptibility in silica optical fibers, has recently been improved by the discovery of an “induction poling” technique¹ and the adoption of liquid electrodes², allowing for poling fibers of any length and geometry. Nevertheless, the nonlinearity created via thermal poling is always limited by the 𝜒⁽³⁾of the optical fiber material and by the maximum electric field that can be frozen inside the glass. For these reasons research is ongoing to determine routes for further improving the nonlinear effects due to the thermal poling process. In this work, we propose to enhance the effects of the thermal poling by exploiting the intrinsic nonlinear properties of some 2D materials³, which are deposited inside the cladding holes of a twin-hole silica fiber. The materials we focused on are 2D Transition Metal Chalcogenide (2D TMDC) MoS₂ and WS₂ and the technique adopted to realize the deposition inside the cladding channels of a twin-hole step index silica fiber consists of a thermal decomposition process4 of the precursor ammonium tetrathiomolybdate (NH4)2MoS⁴ in 6% H₂/Ar flow. The technique has allowed us to uniformly coat the two cladding channels for a length of ≈25 cm with a film nominally consisting in a bi-layer of the 2D materials. A Raman based analysis has been used to test the morphology of the coating. The fiber deposited with 2D materials was later thermally poled and periodically erased via exposure to UV light to reach the QPM condition at a wavelength of ≈1550 nm. The effective 𝜒⁽²⁾ of the fiber was measured via SHG for both the deposited and the pristine fiber, showing an enhancement of the nonlinearity in favor of the deposited one. The phenomenon can be explained by the exploitation of a higher 𝜒⁽³⁾ seen by the pump wave due to the presence of the 2D layer deposited inside the cladding holes and opens the possibility of exploiting the higher intrinsic material 𝜒⁽²⁾, in case of a periodic patterning/synthesis of the TMDC.

Proceedings Article | 13 March 2019 Presentation

High power 1726 nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser (Conference Presentation)

Mark Burns, Peter Shardlow, Pranabesh Barua, Thomas Jefferson-Brain, Jayanta Sahu, William Clarkson

Proceedings Volume 10897, 108970O (2019) https://doi.org/10.1117/12.2510354

KEYWORDS: Fiber lasers, YAG lasers, Absorption, Ytterbium, Polymers, Laser therapeutics, Laser development, High power lasers, Laser sources, Laser systems engineering

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Proceedings Article | 17 November 2017 Open Access

High power pulsed fiber laser development for Co2 space based dial system

Guillaume Canat, Julien Le Gouët, Laurent Lombard, Alexandre Bresson, Didier Goular, Agnès Dolfi-Bouteyre, Sophie Duzellier, Denis Boivin, Johan Nilsson, Jayata Sahu, Sylvain Bordais

Proceedings Volume 10563, 105630T (2017) https://doi.org/10.1117/12.2304221

KEYWORDS: Fiber lasers, Optical amplifiers, Erbium, Diodes, Fiber amplifiers, Laser development, Astronomical imaging, Laser stabilization, Oscillators, Semiconductor lasers

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Proceedings Article | 11 March 2016 Paper

Highly efficient Yb-free Er-La-Al doped ultra-low Na large mode area single-trench fiber laser

Deepak Jain, Shaiful Alam, Yongmin Jung, Pranabesh Barua, Martin Velazquez, Jayanta Sahu

Proceedings Volume 9728, 97280W (2016) https://doi.org/10.1117/12.2211336

KEYWORDS: Fiber lasers, Laser development, Erbium, Fiber amplifiers, Doping, Numerical simulations, Refractive index, Cladding, Laser resonators, Absorption

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Proceedings Article | 7 May 2015 Paper

Specialty fibers for high power lasers and amplifiers

Jayanta Sahu, Deepak Jain, Yongmin Jung

Proceedings Volume 9507, 95070F (2015) https://doi.org/10.1117/12.2185165

KEYWORDS: Optical fibers, Fermium, Frequency modulation, Cladding, High power lasers, Refractive index, Fabrication, Fiber lasers, Specialty optical fibers, Absorption

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Proceedings Article | 4 March 2015 Paper

Picosecond Yb-doped single-trench fiber amplifier with diffraction limited output

Deepak Jain, Philip Gorman, Christophe Codemard, Yongmin Jung, Michalis Zervas, Jayanta Sahu

Proceedings Volume 9344, 93440R (2015) https://doi.org/10.1117/12.2077998

KEYWORDS: Refractive index, Fiber lasers, Fiber amplifiers, Cladding, Doping, Amplifiers, Picosecond phenomena, Solids, Fermium, Frequency modulation

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Proceedings Article | 6 January 2015 Paper

Characterization of fluorescence lifetime of Tm-doped fibers with increased quantum conversion efficiency

Jakub Cajzl, Pavel Peterka, Pavel Honzátko, Jan Mrázek, Ondřej Podrazký, Filip Todorov, Petar Gladkov, Jayanta Sahu, Miguel Nunez-Velazquez, Pavla Nekvindová, Ivan Kašík

Proceedings Volume 9450, 945017 (2015) https://doi.org/10.1117/12.2070425

KEYWORDS: Optical fibers, Luminescence, Quantum efficiency, Thulium, Nanoparticles, Absorption, Refractive index, Aluminum, Doping, Silica

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Proceedings Article | 12 March 2014 Paper

The effect of polarization in passive coherent beam combining of fiber lasers

Hung-Sheng Chiang, James Leger, Emese Huszar, Johan Nilsson, Jayanta Sahu

Proceedings Volume 8961, 89612B (2014) https://doi.org/10.1117/12.2041012

KEYWORDS: Polarization, Polarizers, Phase shifts, Fiber lasers, Diffraction gratings, Laser beam diagnostics, Laser resonators, Phase measurement, Semiconductor lasers, Polarization maintaining fibers

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Proceedings Article | 7 March 2014 Paper

Flexible glass flat-fibre chips and femtosecond laser inscription as enabling technologies for photonic devices

Christos Riziotis, Kyriacos Kalli, Christos Markos, Andreas Posporis, Charalambos Koutsides, Andrew Webb, Christopher Holmes, James Gates, Jayanta Sahu, Peter G. Smith

Proceedings Volume 8982, 89820G (2014) https://doi.org/10.1117/12.2039643

KEYWORDS: Resonators, Microfluidics, Femtosecond phenomena, Fiber Bragg gratings, Structured optical fibers, Glasses, Polishing, Mach-Zehnder interferometers, Integrated optics, Optical fibers

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Proceedings Article | 1 February 2014 Paper

Multi-element fiber for space-division multiplexing

J. Sahu, S. Jain, V. Rancaño, T. May-Smith, A. Webb, P. Petropoulos, D. Richardson

Proceedings Volume 9009, 90090C (2014) https://doi.org/10.1117/12.2044334

KEYWORDS: Amplifiers, Multi-element lenses, Cladding, L band, Space division multiplexing, Fiber amplifiers, Coating, Single mode fibers, Multiplexing, Signal attenuation

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Proceedings Article | 15 October 2013 Paper

Femtosecond laser inscription and micromachining in novel flexible glass flat-fibre chips

K. Kalli, C. Markos, A. Posporis, C. Koutsides, C. Riziotis, A. Webb, J. Sahu, C. Holmes, J. Gates, P. G. Smith

Proceedings Volume 8924, 89240Z (2013) https://doi.org/10.1117/12.2035403

KEYWORDS: Resonators, Femtosecond phenomena, Microfluidics, Fiber Bragg gratings, Micromachining, Glasses, Structured optical fibers, Optical fibers, 3D image processing, Polishing

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Proceedings Article | 12 March 2013 Paper

Recent advances in coupled laser cavity design

James Leger, Hung-Sheng Chiang, Johan Nilsson, Junhau Ji, Jayanta Sahu

Proceedings Volume 8600, 86000S (2013) https://doi.org/10.1117/12.2005628

KEYWORDS: Fiber lasers, Q switching, Laser resonators, Laser systems engineering, Laser development, Superposition, Q switched lasers, Q switches, Optical components, Lasers

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Proceedings Article | 26 February 2010 Paper

Pulsed cladding-pumped large mode area fiber Raman amplifier

Junhua Ji, Christophe Codemard, Jayanta Sahu, Johan Nilsson

Proceedings Volume 7598, 75981C (2010) https://doi.org/10.1117/12.845073

KEYWORDS: Raman spectroscopy, Cladding, Fiber amplifiers, Fiber lasers, Raman scattering, Diffraction, Optical amplifiers, Amplifiers, Laser sources

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Proceedings Article | 17 February 2010 Paper

100-W CW cladding-pumped Raman fiber laser at 1120 nm

C. Codemard, J. Ji, J. Sahu, J. Nilsson

Proceedings Volume 7580, 75801N (2010) https://doi.org/10.1117/12.845606

KEYWORDS: Raman spectroscopy, Fiber lasers, Cladding, Refractive index, Continuous wave operation, Laser resonators, Mirrors, Multimode fibers, Quantum efficiency, Diffraction

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Proceedings Article | 19 February 2009 Paper

Fiber design for high-power fiber lasers

Jayanta Sahu, Seongwoo Yoo, Alexander Boyland, Andrew Webb, Mridu Kalita, Jean-Noel Maran, Yoonchan Jeong, Johan Nilsson, W. Andrew Clarkson, David Payne

Proceedings Volume 7195, 71950I (2009) https://doi.org/10.1117/12.809210

KEYWORDS: Acoustics, Fiber lasers, Cladding, Refractive index, Structured optical fibers, High power fiber lasers, Scattering, Solids, Signal attenuation, Control systems

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Proceedings Article | 12 August 2008 Paper

Power and energy-scaling of cladding-pumped Raman fibre lasers sources

C. Codemard, A. Shirakawa, J.-N. Maran, J. Sahu, J. Nilsson

Proceedings Volume 7099, 70990V (2008) https://doi.org/10.1117/12.806987

KEYWORDS: Raman spectroscopy, Fiber lasers, Cladding, Raman scattering, Beam propagation method, Mirrors, High power lasers, Multimode fibers, Absorption, Continuous wave operation

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Proceedings Article | 12 August 2008 Paper

Progress in high-power single frequency master oscillator power amplifier

Jean-Noel Maran, Yoonchan Jeong, Seongwoo Yoo, Jayanta Sahu, Johan Nilsson

Proceedings Volume 7099, 70990X (2008) https://doi.org/10.1117/12.807075

KEYWORDS: Phase modulation, Optical amplifiers, Fiber lasers, Cladding, Amplifiers, Polarization, Fiber amplifiers, High power lasers, Oscillators, Ytterbium

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Proceedings Article | 20 February 2008 Paper

Impact of energy-transfer-upconversion on the performance of hybrid Er:YAG lasers

Ji Won Kim, J. Sahu, W. Clarkson

Proceedings Volume 6871, 68710W (2008) https://doi.org/10.1117/12.761301

KEYWORDS: Er:YAG lasers, Doping, Fiber lasers, Erbium, Continuous wave operation, Crystals, Ions, Pulsed laser operation, Laser crystals, Resonators

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Proceedings Article | 31 May 2007 Paper

Flat fiber: the flexible format for distributed lab-on-a-chip

Corin B. Gawith, Andrew Webb, Robert Standish, Jayanta Sahu, F. Rafiq Adikan, James Gates, Peter G. Smith

Proceedings Volume 6585, 658508 (2007) https://doi.org/10.1117/12.722873

KEYWORDS: Channel waveguides, Fiber Bragg gratings, Integrated optics, Ultraviolet radiation, Refractive index, Lab on a chip, Photonic integrated circuits, Optical fibers, Waveguides, Birefringence

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Proceedings Article | 21 February 2007 Paper

High-power high-brightness green laser based on a frequency doubled picosecond fiber laser

P. Dupriez, J. Sahu, Y. Jeong, A. Malinowski, D. Richardson, J. Nilsson

Proceedings Volume 6453, 64531H (2007) https://doi.org/10.1117/12.717529

KEYWORDS: Picosecond phenomena, Crystals, Fiber lasers, Second-harmonic generation, Fiber amplifiers, Nonlinear crystals, Laser crystals, Polarization, Optical amplifiers, Amplifiers

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SPIE Journal Paper | 1 January 2007 Open Access

Suspended-core holey fiber for evanescent-field sensing

Andrew Webb, Francesco Poletti, David Richardson, Jayanta Sahu

OE, Vol. 46, Issue 01, 010503, (January 2007) https://doi.org/10.1117/12.10.1117/1.2430505

KEYWORDS: Silica, Cladding, Gases, Solids, Absorption, Fabrication, Gas sensors, Ultrasonics, Structured optical fibers, Glasses

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Proceedings Article | 2 October 2006 Paper

Opportunities in high-power fiber lasers

Jayanta Sahu, Jaesun Kim, Seongwoo Yoo, Andrew Webb, Christophe Codemard, Pascal Dupriez, Yoonchan Jeong, Johan Nilsson, David Richardson, David Payne

Proceedings Volume 6389, 638909 (2006) https://doi.org/10.1117/12.687497

KEYWORDS: Fiber lasers, Optical filters, High power fiber lasers, Waveguides, Fiber amplifiers, Silica, Structured optical fibers, Cladding, Optical fibers, Pulsed laser operation

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Proceedings Article | 17 April 2006 Paper

Novel concepts for high-power fibre lasers

Pu Wang, W. Clarkson, D. Shen, L. Copper, J. Sahu

Proceedings Volume 6190, 61900I (2006) https://doi.org/10.1117/12.668261

KEYWORDS: Fiber lasers, Diodes, Superluminescent sources, Absorption, Silica, Mirrors, Cladding, Fiber coatings, High power fiber lasers, Aspheric lenses

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Proceedings Article | 28 February 2006 Paper

High-power fiber-bulk hybrid lasers

W. Clarkson, Deyuan Shen, Jayanta Sahu

Proceedings Volume 6100, 61000A (2006) https://doi.org/10.1117/12.660930

KEYWORDS: Fiber lasers, Er:YAG lasers, Thulium, Mirrors, Absorption, Resonators, Continuous wave operation, Laser crystals, Reflectivity, Optical fibers

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Proceedings Article | 23 February 2006 Paper

Depressed clad hollow optical fiber with fundamental LP₀₁ mode cut-off

J. Kim, P. Dupriez, D.B.S. Soh, C. Codemard, S. Yoo, Y. Jeong, J. Nilsson, J. Sahu

Proceedings Volume 6102, 61020G (2006) https://doi.org/10.1117/12.653146

KEYWORDS: Fiber lasers, Cladding, Optical fibers, Absorption, Refractive index, Waveguides, Mirrors, Optical filters, Fiber characterization, Structured optical fibers

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Proceedings Article | 23 February 2006 Paper

1 W average power at 589 nm from a frequency doubled pulsed Raman fiber MOPA system

P. Dupriez, C. Farrell, M. Ibsen, J. Sahu, J. Kim, C. Codemard, Y. Jeong, D. Richardson, J. Nilsson

Proceedings Volume 6102, 61021G (2006) https://doi.org/10.1117/12.643864

KEYWORDS: Raman spectroscopy, Fiber lasers, Picosecond phenomena, Ytterbium, Continuous wave operation, Laser guide stars, Laser systems engineering, Fiber amplifiers, Optical simulations, Second-harmonic generation

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Proceedings Article | 12 October 2005 Paper

Power scaling of cladding-pumped Er,Yb-doped fiber lasers at 1.5 µm

W. Andrew Clarkson, Deyuan Shen, Pu Wang, Laurence Cooper, Johan Nilsson, Jayanta Sahu

Proceedings Volume 5958, 59580O (2005) https://doi.org/10.1117/12.623660

KEYWORDS: Fiber lasers, Ytterbium, Absorption, Erbium, Mirrors, Ions, Reflectivity, Beam splitters, Diodes, Lenses

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Proceedings Article | 22 April 2005 Paper

Kilowatt-class single-frequency fiber sources

D. Payne, Y. Jeong, J. Nilsson, J. Sahu, D. Soh, C. Alegria, P. Dupriez, C. Codemard, V. Philippov, V. Hernandez, R. Horley, L. Hickey, L. Wanzcyk, C. Chryssou, J. Alvarez-Chavez, P. Turner

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.601145

KEYWORDS: Fiber lasers, Amplifiers, Coating, Laser scattering, Scattering, Optical amplifiers, Diodes, Ytterbium, Silica, Raman spectroscopy

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Proceedings Article | 22 April 2005 Paper

Advances in high-power short-pulse fiber laser systems and technology

J. Price, A. Malinowski, A. Piper, F. He, W. Belardi, T. Monro, M. Ibsen, B. Thomsen, Y. Jeong, C. Codemard, M. Roelens, P. Dupriez, J. Sahu, J. Nilsson, D. Richardson

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.602600

KEYWORDS: Optical amplifiers, Dispersion, Fiber amplifiers, Fiber lasers, Micro optical fluidics, Ytterbium, Amplifiers, Laser applications, Neodymium, Picosecond phenomena

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Proceedings Article | 22 April 2005 Paper

Analytic modeling of Brillouin gain in rare-earth doped fiber amplifiers with high-power single-frequency signals

V. Kovalev, R. Harrison, J. Nilsson, Y. Jeong, V. Hernandes-Solis, J. Sahu

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.591913

KEYWORDS: Fiber amplifiers, Amplifiers, High power fiber amplifiers, Picosecond phenomena, Optical amplifiers, Absorption, Fiber lasers, Optical fibers, Nonlinear optics, Laser scattering

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Proceedings Article | 23 December 2004 Paper

Efficient holmium-doped solid state lasers pumped by a Tm-doped silica fiber laser

Deyuan Shen, Jayanta Sahu, W. Andrew Clarkson

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.578515

KEYWORDS: Fiber lasers, Absorption, Resonators, Bragg cells, Tunable lasers, Crystals, Laser resonators, Laser crystals, Mirrors, Transmission electron microscopy

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Proceedings Article | 23 December 2004 Paper

All-fiber 0.4-mJ high-coherence eye-safe optical source

Valery Philippov, Jayanta Sahu, Christophe Codemard, Johan Nilsson, Guy Pearson

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.580077

KEYWORDS: Oscillators, Fiber lasers, Optical amplifiers, Fiber Bragg gratings, Q switched lasers, Fiber amplifiers, High power fiber amplifiers, LIDAR, Diodes, Amplifiers

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Proceedings Article | 23 December 2004 Paper

Thulium-ytterbium co-doped fiber laser with 75 W of output power at 2 µm

Yoonchan Jeong, Pascal Dupriez, Jayanta Sahu, Johan Nilsson, Deyuan Shen, W. Andrew Clarkson, Stuart Jackson

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.578727

KEYWORDS: Ytterbium, Thulium, Fiber lasers, Absorption, Diodes, Erbium, Mirrors, Tunable lasers, Coating, Energy transfer

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Proceedings Article | 23 December 2004 Paper

High-power Er:YAG laser at 1646 nm pumped by an Er, Yb fiber laser

Peter Jander, Jayanta Sahu, W. Andrew Clarkson

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.578217

KEYWORDS: Fiber lasers, Er:YAG lasers, Erbium, Crystals, Absorption, Laser crystals, Output couplers, Diodes, Ytterbium, Continuous wave operation

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Proceedings Article | 9 June 2004 Paper

Doppler velocimetry using the self-mixing effect in a short double-clad Er-Yb-doped phosphate fiber laser

Mathieu Laroche, Luc Kervevan, Herve Gilles, Sylvain Girard, Jayanta Sahu

Proceedings Volume 5502, (2004) https://doi.org/10.1117/12.566525

KEYWORDS: Fiber lasers, Doppler effect, Velocimetry, Erbium, Energy transfer, Ions, Modulation, Output couplers, Ytterbium, Signal detection

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Proceedings Article | 7 June 2004 Paper

An 18-mW 488.7-nm cw frequency-doubled fiber MOPA source

Daniel Soh, Christophe Codemard, Jayanta Sahu, Johan Nilsson, Seungin Baek, Shunhua Wang, Fredrik Laurell

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.526919

KEYWORDS: Fiber lasers, Fiber amplifiers, Ferroelectric materials, Second-harmonic generation, Tunable lasers, Crystals, Optical amplifiers, Amplifiers, Laser applications

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Proceedings Article | 7 June 2004 Paper

All-fiber 1.15-mJ pulsed eye-safe optical source

Valery Philippov, Jayanta Sahu, Christophe Codemard, William Clarkson, Joo-Nyung Jang, Johan Nilsson, Guy Pearson

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.527451

KEYWORDS: Fiber amplifiers, Fiber lasers, Optical amplifiers, Oscillators, Pulsed laser operation, High power fiber amplifiers, Q switched lasers, Amplifiers, Single mode fibers, LCDs

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Proceedings Article | 7 June 2004 Paper

Wideband tunable high-power narrow-linewidth erbium-ytterbium-doped fiber laser using compression-tunable fiber Bragg grating

Carlos Alegria, Yoonchan Jeong, Christophe Codemard, Jayanta Sahu, Libin Fu, Mohd Mokhtar, Morten Ibsen, Seungin Baek, Daniel Soh, Valery Philippov, Johan Nilsson

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.528190

KEYWORDS: Fiber lasers, Single mode fibers, Fiber Bragg gratings, Tunable lasers, Diodes, Ytterbium, Cladding, Laser applications, Laser resonators, Ions

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Proceedings Article | 7 June 2004 Paper

Continuous-wave all-fiber MOPA with SBS phase conjugate mirror

Valeri Kovalev, Robert Harrison, Jayanta Sahu, Johan Nilsson

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.529189

KEYWORDS: Fiber amplifiers, Phase conjugation, Amplifiers, Optical amplifiers, Mirrors, Continuous wave operation, Oscillators, Nd:YAG lasers, Fiber lasers, Diffraction

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Proceedings Article | 3 July 2003 Paper

High-power fiber lasers: new developments

Johan Nilsson, Jayanta Sahu, Yoochan Jeong, W. Clarkson, R. Selvas, Anatoly Grudinin, Shaiful Alam

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.478310

KEYWORDS: Fiber lasers, Cladding, Ytterbium, Glasses, Diodes, Absorption, Laser damage threshold, Optical amplifiers, High power fiber lasers, Laser crystals

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Proceedings Article | 15 December 2000 Paper

PECVD technology for low-temperature fabrication of silica-on-silicon-based channel waveguides and devices

Lech Wosinski, Jayanta Sahu, Matteo Dainese, Harendra Fernando

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406444

KEYWORDS: Oxides, Silica, Channel waveguides, Plasma enhanced chemical vapor deposition, Waveguides, Silicon, Nitrous oxide, Annealing, Absorption, Optical communications

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Proceedings Article | 29 December 1999 Paper

Reduction of absorption loss in silica-on-silicon channel waveguides fabricated by low-temperature PECVD process

Jayanta Sahu, Lech Wosinski, Harendra Fernando

Proceedings Volume 4016, (1999) https://doi.org/10.1117/12.373601

KEYWORDS: Waveguides, Plasma enhanced chemical vapor deposition, Annealing, Channel waveguides, Absorption, Silica, Fabrication, Silicon, Refractive index, Nitrous oxide

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Proceedings Article | 2 January 1998 Paper

Fabrication of optical fibers containing rare-earth ions

J. Sahu, A. Biswas, M. Chakraborty, H. Acharya

Proceedings Volume 3211, (1998) https://doi.org/10.1117/12.345371

KEYWORDS: Optical fibers, Ions, Doping, Luminescence, Absorption, Silica, Fiber lasers, Amplifiers, Sensors, Light emitting diodes

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The growing interests in fibre lasers, amplifiers and sensors have led to the need for fabricating preforms and fibres with the given concentration of rare-earth ions and composition of the host matrix. Several techniques have been developed, of which the solution doping process to incorporate rare-earth ions into the core of fibre is now most widely used. In.this technique rare-earth ions are introduced from solutions and a number of modifications to the conventional MCVD process allow the incorporation of dopant ions from solution. In this paper, we report measurements of the R.I. profile, distribution of rare-earth ions in the silica matrix, Photoluminescence spectra of the rare-earth ions in the silica matrix as a function of composition of matrix and absorption spectra for preforms and fibers made through solution doping technique. The soot was deposited in such a way that it forms a porous and adherent layer suitable for solution doping. A detail thermochemical calculation has been worked out to ascertain reaction kinetics including temperature for completion of reaction, efficient deposition and dehydration of soot. Calculation shows higher refractive index is obtained for a given flow rate of GeCl4 in a solution doped preform than the conventional MCVD preform. NJ/OJ has been used in place of Cl2/02 and it gives reasonable dehydration efficiency to remove -OH ions. The effectiveness of the dehydration procedure is confirmed by the very low -OH ion absorption loss around 1390nm. The rare-earth doped preforms and fibres with different core compositions (GeO2-SiO2, GeO2-Al2O3-SiO2, Al2O3-P2O5-SiO2 and P2Os-SiO2) fabricated have been characterised by measuring the R.I. profile, attenuation and fluorescence spectra. The doped fiber shows the change in relative intensity of the absorption peak for different host composition. Strong fluorescence has been observed at around 1536 nm for Er3+ ion in Ge02-Si02 host glass. However, the peak changes its position and shape when A1 put in the host.

Showing 5 of 51 publications

Proceedings Volume Editor (1)

SPIE Conference Volume | 24 January 2018

2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications

Conference Committee Involvement (6)

Specialty Optical Fibres 2025

7 April 2025 | Prague, Czech Republic

International Conference on Optical Instruments and Technology 2017: Advanced Laser Technology and Applications

28 October 2017 | Beijing, China

Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI

31 January 2017 | San Francisco, California, United States

Next-Generation Optical Communication: Components, Sub-Systems, and Systems V

16 February 2016 | San Francisco, California, United States

Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV

10 February 2015 | San Francisco, California, United States

Showing 5 of 6 Conference Committees

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