Dr. Joshua D. Bradford Profile

Dr. Joshua D. Bradford

at Coherent/Nufern

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 13 March 2024 Presentation

PM single-mode Er:Yb fiber for high power 1.5 um laser systems

S. Gausmann, M. Goldsmith, A. Marquis, TC. Wen, S. Nye, A. Suresh, J. Bradford, C. Jollivet

Proceedings Volume PC12865, PC128650K (2024) https://doi.org/10.1117/12.3000182

KEYWORDS: Remote sensing, Quantum technologies, Quantum optical communication, Quantum operations, Quantum enhancement, Quantum computing, Quantum coherence, Polarization, LIDAR, High power lasers

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Proceedings Article | 9 March 2023 Presentation

High concentration large-mode-area Tm-doped double-clad fiber for high efficiency operation

Stefan Gausmann, Benoit Faugas, Joshua Bradford, Mark Goldsmith, Adrian Carter, Kanishka Tankala, Clemence Jollivet

Proceedings Volume 12400, 124000L (2023) https://doi.org/10.1117/12.2650126

KEYWORDS: Thulium, Single mode fibers, Manufacturing, Fiber lasers

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Proceedings Article | 4 March 2022 Presentation

Novel extra-large mode area Yb-doped fibers for high energy and high average power industrial laser systems

Joshua Bradford, Mike Conroy, Mark Goldsmith, Adrian Carter, Kanishka Tankala, Clémence Jollivet

Proceedings Volume PC11981, PC1198105 (2022) https://doi.org/10.1117/12.2609159

KEYWORDS: Optical fibers, Laser systems engineering, Fiber lasers, Thermal efficiency, Particles, Optical amplifiers, Materials processing, Manufacturing, Fiber amplifiers, Energy efficiency

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Proceedings Article | 8 March 2021 Presentation

TMI in high power fiber lasers: Impact on fiber design and mitigation strategies

Joshua Bradford, Mike Conroy, Mark Goldsmith, Clémence Jollivet

Proceedings Volume 11665, 1166522 (2021) https://doi.org/10.1117/12.2592953

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Proceedings Article | 11 March 2020 Presentation

Novel active DC fiber designs mitigating SRS and TMI in industrial lasers operating above 2 kW (Conference Presentation)

Joshua Bradford

Proceedings Volume 11260, 1126007 (2020) https://doi.org/10.1117/12.2551361

KEYWORDS: Fiber lasers, Oscillators, Ytterbium, Raman scattering, Waveguides, Laser marking

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Proceedings Article | 4 May 2018 Presentation + Paper

Progress on high-power Yb, Tm and Raman fiber lasers

Patrick Roumayah, Alex Sincore, Justin Cook, Joshua Bradford, Jose Enrique Antonio-Lopez, Stefan Gausmann, Dong Jin Shin, Ali Abdulfattah, Lawrence Shah, Axel Schülzgen, Rodrigo Amezcua Correa, Martin Richardson

Proceedings Volume 10637, 1063702 (2018) https://doi.org/10.1117/12.2305241

KEYWORDS: Fiber lasers, Raman spectroscopy, Cladding, Refractive index, Fiber amplifiers, Ytterbium, Thulium, Graded index fibers, Amplifiers, Optical amplifiers

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Proceedings Article | 4 May 2018 Presentation + Paper

700 μJ, 100 ns, 20 kHz pulses from a 1.5 m Thulium-doped fiber amplifier

Ali Abdulfattah, Alex Sincore, Joshua Bradford, Nathan Bodnar, Justin Cook, Lawrence Shah, Martin Richardson

Proceedings Volume 10637, 106370I (2018) https://doi.org/10.1117/12.2305160

KEYWORDS: Fiber amplifiers, Oscillators, Amplifiers, Fiber lasers, Q switching, Laser systems engineering, Thulium

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Proceedings Article | 26 February 2018 Presentation + Paper

High average power pulsed multi-mode Raman fiber laser in graded index fiber

Patrick Roumayah, Joshua Bradford, Justin Cook, Jose Enrique Antonio-Lopez, Rodrigo Amezcua Correa, Martin Richardson

Proceedings Volume 10512, 105121X (2018) https://doi.org/10.1117/12.2289308

KEYWORDS: Raman spectroscopy, Fiber lasers, Graded index fibers, Pulsed laser operation, Silica, Refractive index, Multimode fibers, Laser development, Laser systems engineering, Germanium

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Proceedings Article | 26 February 2018 Presentation + Paper

Demonstration of passively cooled high-power Yb fiber amplifier

Joshua Bradford, Justin Cook, Jose Enrique Antonio-Lopez, Larry Shah, Rodrigo Amezcua Correa, Martin Richardson

Proceedings Volume 10512, 105121G (2018) https://doi.org/10.1117/12.2290243

KEYWORDS: Optical amplifiers, Fiber amplifiers, Ytterbium, Interferometers, Temperature metrology, Amplifiers, Convection, Interferometry, Single mode fibers, Fringe analysis

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Proceedings Article | 26 February 2018 Presentation + Paper

Experimental investigation on varying spectral bandwidth when amplifying a pulsed superfluorescent 2-μm source in Tm:fiber

Alex Sincore, Justin Cook, Joshua Bradford, Nathan Bodnar, Martin Richardson

Proceedings Volume 10512, 105120P (2018) https://doi.org/10.1117/12.2290217

KEYWORDS: Fiber lasers, Amplifiers, Optical amplifiers, Fiber amplifiers, Modulation, Optical filters, Bragg cells, Thulium, Polarization, Supercontinuum generation

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Proceedings Article | 21 April 2017 Presentation

Mobile terawatt laser propagation facility (Conference Presentation)

Lawrence Shah, Patrick Roumayah, Nathan Bodnar, Joshua Bradford, Douglas Maukonen, Martin Richardson

Proceedings Volume 10082, 1008218 (2017) https://doi.org/10.1117/12.2253736

KEYWORDS: Laser systems engineering, Control systems, Atmospheric propagation, Laser beam propagation, Pulsed laser operation, Femtosecond phenomena, Fiber lasers, Oscillators, Fiber Bragg gratings, Sensing systems

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Proceedings Article | 7 March 2017 Presentation + Paper

Nonlinear processes associated with the amplification of MHz-linewidth laser pulses in single-mode Tm:fiber

Alex Sincore, Nathan Bodnar, Joshua Bradford, Ali Abdulfattah, Lawrence Shah, Martin Richardson

Proceedings Volume 10083, 100830K (2017) https://doi.org/10.1117/12.2251033

KEYWORDS: Modulation, Bragg cells, Nonlinear dynamics, Laser scattering, Scattering, Amplifiers, Diodes, Raman scattering, Four wave mixing

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Proceedings Article | 22 April 2016 Paper

Integrated pulse stretchers for high-energy CPA and OPCPA systems

Lawrence Shah, Nathan Bodnar, Patrick Roumayah, Benjamin Webb, Joshua Bradford, Martin Richardson

Proceedings Volume 9730, 97300V (2016) https://doi.org/10.1117/12.2212900

KEYWORDS: Fiber Bragg gratings, Pulsed laser operation, Optical design, Ultrafast phenomena, Laser optics, Optical amplifiers, Diffraction gratings, Solid state lasers, Dispersion, Laser systems engineering, Integrated optics, Picosecond phenomena, Oscillators, Adaptive optics

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Proceedings Article | 1 July 2014 Paper

Examination of laser-induced heating on multi-component chalcogenide glass

Laura Sisken, Nils Gehlich, Joshua Bradford, Ali Abdulfattah, Larry Shah, Martin Richardson, Kathleen Richardson

Proceedings Volume 9070, 90701A (2014) https://doi.org/10.1117/12.2053316

KEYWORDS: Glasses, Crystals, Chalcogenide glass, Laser crystals, Laser ablation, Solids, Infrared radiation, Ceramics, Neodymium, Ions

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Proceedings Article | 9 June 2014 Paper

Thulium fiber laser and application development

Lawrence Shah, Christian Gaida, Martin Gebhardt, Alex Sincore, Joshua Bradford, Nils Gehlich, Ilya Mingareev, Martin Richardson

Proceedings Volume 9081, 90810H (2014) https://doi.org/10.1117/12.2053297

KEYWORDS: Fiber lasers, Laser development, Laser applications, YAG lasers, Fiber amplifiers, Optical amplifiers, Defense and security, Mid-IR, Optical parametric oscillators, Thulium

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Proceedings Article | 20 February 2014 Paper

Measurement of thermal lensing in GaAs induced by 100 W Tm:fiber laser

Joshua Bradford, Konstantin Vodopyanov, Peter Schunemann, Lawrence Shah, Martin Richardson

Proceedings Volume 8964, 896419 (2014) https://doi.org/10.1117/12.2041323

KEYWORDS: Gallium arsenide, Mid-IR, Semiconducting wafers, Wavefront sensors, Refractor telescopes, Optical parametric oscillators, Laser beam diagnostics, Distortion, Thermal effects, Optical testing

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Proceedings Article | 18 March 2013 Paper

Thermo-optic quality assessment of doped optical ceramics

Christina C. Willis, Joshua Bradford, Emily Maddox, Lawrence Shah, Martin Richardson

Proceedings Volume 8599, 85990Z (2013) https://doi.org/10.1117/12.2004360

KEYWORDS: Ceramics, Crystals, Thermography, Wavefront sensors, Laser applications, Thermal optics, Diagnostics, Absorption, Diodes, High power lasers

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Proceedings Article | 7 May 2012 Paper

Integrated 100 W thulium fiber MOPA system

Lawrence Shah, R. Andrew Sims, Pankaj Kadwani, Christina C. Willis, Joshua Bradford, Zachary Roth, Aaron Pung, Menelous Poutous, Eric Johnson, Martin Richardson

Proceedings Volume 8381, 83810Z (2012) https://doi.org/10.1117/12.925411

KEYWORDS: Phase modulation, Oscillators, Fiber lasers, Fiber amplifiers, Optical amplifiers, Polarization, Optical isolators, Thulium, System integration, Amplifiers

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Proceedings Article | 16 February 2012 Paper

Integrated 100-W polarized narrow linewidth thulium fiber MOPA system

Lawrence Shah, R. Andrew Sims, Pankaj Kadwani, Christina C. Willis, Joshua Bradford, Zachary Roth, Aaron Pung, Menelaos Poutous, Eric Johnson, Martin Richardson

Proceedings Volume 8237, 82371M (2012) https://doi.org/10.1117/12.909292

KEYWORDS: Oscillators, Phase modulation, Optical amplifiers, Polarization, Diodes, Amplifiers, Thulium, Fiber lasers, Fiber amplifiers, High power fiber amplifiers

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Proceedings Article | 7 February 2012 Paper

High-power transmission characterization of Chalcogenide glasses using a Tm:fiber laser system

Pankaj Kadwani, Joshua Bradford, R. Andrew Sims, David Musgraves, Kathleen Richardson, Lawrence Shah, Martin Richardson

Proceedings Volume 8239, 82390A (2012) https://doi.org/10.1117/12.909505

KEYWORDS: Silica, High power lasers, Chalcogenide glass, Laser systems engineering, Selenium, Fiber lasers, Semiconductor lasers, Near infrared, Thermal optics, Absorption

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Proceedings Article | 26 May 2011 Paper

Monolithic narrow linewidth polarization-maintaining thulium fiber laser using femtosecond laser written fiber Bragg gratings

Christina C. Willis, Joshua Bradford, R. Andrew Sims, Lawrence Shah, Martin Richardson, Jens Thomas, Ria Becker, Christian Voigtländer, Andreas Tünnermann, Stefan Nolte

Proceedings Volume 8039, 80390H (2011) https://doi.org/10.1117/12.885989

KEYWORDS: Fiber Bragg gratings, Polarization, Fiber lasers, Reflectivity, YAG lasers, Femtosecond phenomena, Laser systems engineering, Optical components, Optical fibers, Phase modulation

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Proceedings Article | 11 February 2011 Paper

All-fiber single-mode PM thulium fiber lasers using femtosecond laser written fiber Bragg gratings

Christina C. Willis, Joshua Bradford, R. Andrew Sims, Lawrence Shah, Martin Richardson, Jens Thomas, Ria Becker, Christian Voigtländer, Andreas Tünnermann, Stefan Nolte

Proceedings Volume 7914, 79140I (2011) https://doi.org/10.1117/12.877795

KEYWORDS: Fiber Bragg gratings, Fiber lasers, Polarization, Phase modulation, YAG lasers, Thulium, Continuous wave operation, Femtosecond phenomena, Laser systems engineering, Birefringence

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Showing 5 of 22 publications

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