Dr. Jens Schwarz Profile

Dr. Jens Schwarz

Laser Scientist at Sandia National Labs

SPIE Involvement:

Author

Proceedings Article | 6 December 2016 Open Access

Sandia's Z-Backlighter Laser Facility

P. Rambo, J. Schwarz, M. Schollmeier, M. Geissel, I. Smith, M. Kimmel, C. Speas, J. Shores, D. Armstrong, J. Bellum, E. Field, D. Kletecka, J. Porter

Proceedings Volume 10014, 100140Z (2016) https://doi.org/10.1117/12.2245271

KEYWORDS: Glasses, X-rays, Laser energy, Optical amplifiers, X-ray imaging, Optical coatings, Pulsed laser operation, Fusion energy, Diagnostics, Laser beam diagnostics

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Proceedings Article | 10 September 2011 Paper

Optical modeling of the Q-switch lasers with a coherent gain model

George Lawrence, Anthony Yu, Jens Schwarz

Proceedings Volume 8127, 812704 (2011) https://doi.org/10.1117/12.894512

KEYWORDS: Q switching, 3D modeling, Q switched lasers, Performance modeling, Transient nonlinear optics, Laser resonators, Systems modeling, Laser optics, Waveguides, Optical components

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Proceedings Article | 9 June 2011 Paper

Z-Backlighter facility upgrades: a path to short/long pulse, multi-frame, multi-color x-ray backlighting at the Z-Accelerator

Jens Schwarz, Patrick Rambo, Matthias Geissel, Mark Kimmel, Marius Schollmeier, Ian Smith, John Bellum, Damon Kletecka, Adam Sefkow, Douglas Smith, Briggs Atherton

Proceedings Volume 8080, 80800E (2011) https://doi.org/10.1117/12.887114

KEYWORDS: X-rays, Coating, X-ray sources, Pulsed laser operation, Crystals, Laser damage threshold, Picosecond phenomena, X-ray imaging, Aluminum, Sensors

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Proceedings Article | 2 December 2010 Paper

Dual wavelength laser damage testing for high energy lasers

Mark Kimmel, Patrick Rambo, Jens Schwarz, John Bellum, Briggs Atherton

Proceedings Volume 7842, 78421O (2010) https://doi.org/10.1117/12.867743

KEYWORDS: Laser energy, Pulsed laser operation, Laser induced damage, Optical damage, Optical testing, Laser damage threshold, Laser systems engineering, Reflectors, Laser optics, Physics

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As high energy laser systems evolve towards higher energies, fundamental material properties such as the laserinduced damage threshold (LIDT) of the optics limit the overall system performance. The Z-Backlighter Laser Facility at Sandia National Laboratories uses a pair of such kiljoule-class Nd:Phosphate Glass lasers for x-ray radiography of high energy density physics events on the Z-Accelerator. These two systems, the Z-Beamlet system operating at 527nm/ 1ns and the Z-Petawatt system operating at 1054nm/ 0.5ps, can be combined for some experimental applications. In these scenarios, dichroic beam combining optics and subsequent dual wavelength high reflectors will see a high fluence from combined simultaneous laser exposure and may even see lingering effects when used for pump-probe configurations. Only recently have researchers begun to explore such concerns, looking at individual and simultaneous exposures of optics to 1064 and third harmonic 355nm light from Nd:YAG [1]. However, to our knowledge, measurements of simultaneous and delayed dual wavelength damage thresholds on such optics have not been performed for exposure to 1054nm and its second harmonic light, especially when the pulses are of disparate pulse duration. The Z-Backlighter Facility has an instrumented damage tester setup to examine the issues of laser-induced damage thresholds in a variety of such situations [2] . Using this damage tester, we have measured the LIDT of dual wavelength high reflectors at 1054nm/0.5ps and 532nm/7ns, separately and spatially combined, both co-temporal and delayed, with single and multiple exposures. We found that the LIDT of the sample at 1054nm/0.5ps can be significantly lowered, from 1.32J/cm² damage fluence with 1054/0.5ps only to 1.05 J/cm² with the simultaneous presence of 532nm/7ns laser light at a fluence of 8.1 J/cm². This reduction of LIDT of the sample at 1054nm/0.5ps continues as the fluence of 532nm/7ns laser light simultaneously present increases. The reduction of LIDT does not occur when the 2 pulses are temporally separated. This paper will also present dual wavelength LIDT results of commercial dichroic beam-combining optics simultaneously exposed with laser light at 1054nm/2.5ns and 532nm/7ns.

Proceedings Article | 29 November 2010 Paper

Laser damage by ns and sub-ps pulses on hafnia/silica anti-reflection coatings on fused silica double-sided polished using zirconia or ceria and washed with or without an alumina wash step

John Bellum, Damon Kletecka, Mark Kimmel, Patrick Rambo, Ian Smith, Jens Schwarz, Briggs Atherton, Zachary Hobbs, Douglas Smith

Proceedings Volume 7842, 784208 (2010) https://doi.org/10.1117/12.868350

KEYWORDS: Polishing, Zirconium dioxide, Laser induced damage, Surface finishing, Coating, Antireflective coatings, Mode locking, Silica, Particles, Resistance

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Proceedings Article | 31 December 2009 Paper

Meeting thin film design and production challenges for laser damage resistant optical coatings at the Sandia Large Optics Coating Operation

John Bellum, Damon Kletecka, Patrick Rambo, Ian Smith, Mark Kimmel, Jens Schwarz, Matthias Geissel, Guild Copeland, Briggs Atherton, Douglas Smith, Claire Smith, Constantine Khripin

Proceedings Volume 7504, 75040C (2009) https://doi.org/10.1117/12.836597

KEYWORDS: Coating, Surface roughness, Laser induced damage, Reflectivity, Mirrors, Silica, Ion beams, Atomic force microscopy, Reflection, Pulsed laser operation

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Proceedings Article | 31 December 2009 Paper

Optical damage testing at the Z-Backlighter facility at Sandia National Laboratories

Mark Kimmel, Patrick Rambo, Robin Broyles, Matthias Geissel, Jens Schwarz, John Bellum, Briggs Atherton

Proceedings Volume 7504, 75041G (2009) https://doi.org/10.1117/12.836917

KEYWORDS: Laser damage threshold, Optical damage, Pulsed laser operation, Optical testing, Silica, Laser energy, Coating, Laser induced damage, Optical coatings, Dielectrics

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Proceedings Article | 30 December 2008 Paper

Short pulse laser damage testing on nitrocellulose and polyimide thin films in vacuum with application to laser debris shields

Mark Kimmel, Jens Schwarz, Patrick Rambo, Matthias Geissel, Briggs Atherton

Proceedings Volume 7132, 71321O (2008) https://doi.org/10.1117/12.803825

KEYWORDS: Thin films, Pulsed laser operation, Laser induced damage, Laser damage threshold, Laser systems engineering, X-rays, Metals, Diffraction gratings, Radio optics, Optical amplifiers

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Proceedings Article | 20 December 2007 Paper

Studies on thin films as short pulse laser debris shields

Jens Schwarz, Patrick Rambo, Matthias Geissel, Daniel Headley, Marc Ramsey, Briggs Atherton

Proceedings Volume 6720, 67200Q (2007) https://doi.org/10.1117/12.752605

KEYWORDS: Thin films, Absorption, Wavefronts, Pulsed laser operation, Birefringence, Laser damage threshold, Tolerancing, Polarization, Photovoltaics, Radio optics

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SPIE Journal Paper | 1 September 2005

Simple temporal pulse shaping using two Pockels cells

Jens Schwarz, Patrick Rambo, Ian Smith, John Porter

OE, Vol. 44, Issue 09, 094203, (September 2005) https://doi.org/10.1117/12.10.1117/1.2052709

KEYWORDS: Pulse shaping, Pulsed laser operation, Optical amplifiers, Crystals, Polarizers, Optical engineering, Laser crystals, Laser systems engineering, Harmonic generation, Picosecond phenomena

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Proceedings Article | 21 February 2005 Paper

Highly sensitive method for measuring the onset of damage using a micro channel plate

Jens Schwarz, Laurence Ruggles, Patrick Rambo, John Porter

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585377

KEYWORDS: Microchannel plates, Silica, Ions, Laser damage threshold, Laser induced damage, Plasma, Diagnostics, Image processing, Relays, Laser systems engineering

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Proceedings Article | 13 September 2002 Paper

UV filaments and their application for laser-induced lightning and high-aspect-ratio hole drilling

Jens Schwarz, Jean-Claude Diels

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482137

KEYWORDS: Medium wave, Atmospheric propagation, Laser drilling, Ultraviolet radiation, Diffusers, High power lasers, Laser ablation, Laser beam propagation, Diagnostics, Picosecond phenomena

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Proceedings Article | 4 June 2002 Paper

UV filaments and their application for directed energy

Jens Schwarz, Jean-Claude Diels

Proceedings Volume 4632, (2002) https://doi.org/10.1117/12.469749

KEYWORDS: Medium wave, Ultraviolet radiation, Directed energy weapons, Mirrors, Alexandrite lasers, Beam controllers, Laser beam propagation, Pulsed laser operation, Excimer lasers, Laser marking

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Proceedings Article | 11 January 2000 Paper

Tests of laser-induced discharge of high dc voltage using high-power femtosecond UV pulses

Jean-Claude Diels, Patrick Rambo, Jens Schwarz, Luca Giuggioli, Jens Biegert, Vaclav Kubecek, Ralph Bernstein

Proceedings Volume 3886, (2000) https://doi.org/10.1117/12.375106

KEYWORDS: Plasma, Ultraviolet radiation, Ionization, Femtosecond phenomena, Electrodes, Interferometry, Optical amplifiers, Spectroscopy, High power lasers, Laser sources

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Showing 5 of 14 publications

Conference Committee Involvement (1)

High-Power, High-Energy, and High-Intensity Laser Technology

3 April 2019 | Prague, Czech Republic

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