Dr. John B. Trenholme Profile

Dr. John B. Trenholme

at Lawrence Livermore National Lab

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 23 November 2011 Paper

Modeling max-of-n fluence distribution for optics lifetime

Zhi Liao, John Hubel, John Trenholme, C. Wren Carr

Proceedings Volume 8190, 81900W (2011) https://doi.org/10.1117/12.899367

KEYWORDS: Laser systems engineering, Systems modeling, Laser optics, Pulsed laser operation, Near field, National Ignition Facility, Near field optics, Algorithm development, Laser induced damage, Laser development

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Proceedings Article | 7 February 2006 Paper

Simple model of laser damage initiation and conditioning in frequency conversion crystals

M.D. Feit, A.M. Rubenchik, J.B. Trenholme

Proceedings Volume 5991, 59910W (2006) https://doi.org/10.1117/12.638830

KEYWORDS: Laser crystals, Crystals, Laser induced damage, Frequency conversion, Absorption, Laser damage threshold, Resistance, Plasma, Data modeling, Bulk lasers

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Proceedings Article | 7 February 2006 Paper

A summary of recent damage-initiation experiments on KDP crystals

C.W. Carr, M.D. Feit, A.M. Rubenchik, J.B. Trenholme, M.L. Spaeth

Proceedings Volume 5991, 59911Q (2006) https://doi.org/10.1117/12.638829

KEYWORDS: Crystals, Absorption, Laser induced damage, Gaussian pulse, Pulsed laser operation, Calibration, Laser crystals, Light scattering, Scatter measurement, Laser scattering

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Proceedings Article | 7 February 2006 Paper

Size-selection initiation model extended to include shape and random factors

John Trenholme, Michael Feit, Alexander Rubenchik

Proceedings Volume 5991, 59910X (2006) https://doi.org/10.1117/12.638834

KEYWORDS: Absorption, Diffusion, Data modeling, Convolution, Laser induced damage, Pulsed laser operation, Laser irradiation, Stochastic processes, Particles, Temperature metrology

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Proceedings Article | 23 July 1999 Paper

Application of adaptive optics for controlling the NIF laser performance and spot size

Richard Sacks, Jerome Auerbach, Erlan Bliss, Mark Henesian, Janice Lawson, Kenneth Manes, P. Renard, J. Thaddeus Salmon, John Trenholme, Wade Williams, Scott Winters, Richard Zacharias

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354146

KEYWORDS: Wavefronts, National Ignition Facility, Actuators, Adaptive optics, Optical amplifiers, Mirrors, Sensors, Beam splitters, Cobalt, Beam shaping

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Proceedings Article | 23 July 1999 Paper

NIF optical specifications: the importance of the RMS gradient

Janice Lawson, Jerome Auerbach, R. Edward English, Mark Henesian, John Hunt, Richard Sacks, John Trenholme, Wade Williams, Milton Shoup, John Kelly, Christopher Cotton

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354145

KEYWORDS: National Ignition Facility, Wavefronts, Optics manufacturing, Adaptive optics, Near field optics, Optical testing, Spatial frequencies, Wavefront distortions, Linear filtering, Manufacturing

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Proceedings Article | 8 December 1997 Paper

Use of beam propagation modeling of Beamlet and Nova to ensure a "safe" National Ignition Facility laser system design

Mark Henesian, P. Renard, Jerome Auerbach, John Caird, B. Ehrlich, Steven Haney, John Hunt, Janice Lawson, Kenneth Manes, David Milam, Richard Sacks, Lynn Seppala, I. Smith, David Speck, Calvin Thompson, Bruno Van Wonterghem, Paul Wegner, Timothy Weiland, C. Clay Widmayer, Wade Williams, John Trenholme

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294244

KEYWORDS: Optical amplifiers, Spatial filters, Optical simulations, National Ignition Facility, Modulation, Near field, Optical filters, Laser beam propagation, Electronic filtering, Amplifiers

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Proceedings Article | 8 December 1997 Paper

Effect of amplifier gain, loss, and gain profile on system performance

C. Clay Widmayer, Alvin Erlandson, Charles Orth, Scott Haney, Richard Sacks, Mark Henesian, Janice Lawson, Mark Rotter, David Speck, John Trenholme, Bruno Van Wonterghem, Kenneth Jancaitis, Wade Williams

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294340

KEYWORDS: Optical amplifiers, National Ignition Facility, Electronic filtering, Diamond, Laser energy, Performance modeling, Signal attenuation, Diffraction, Vignetting, Lithium

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Proceedings Article | 8 December 1997 Paper

Optimized NIF laser system based on ICF target requirements

Scott Haney, Wade Williams, Richard Sacks, Charles Orth, Jerome Auerbach, Janice Lawson, Mark Henesian, Kenneth Jancaitis, P. Renard, John Trenholme

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294343

KEYWORDS: National Ignition Facility, Data modeling, Optimization (mathematics), Optical amplifiers, Switches, Amplifiers, Frequency conversion, Parallel processing, Data conversion, Thermography

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The design of the National Ignition Facility (NIF) is the result of optimization studies that maximized laser performance and reliability within a restricted cost budget. We modeled the laser using a suite of tools that included a 1D propagation code, a frequency conversion code, a 2D ray trace code for calculating the gain profile, thermo- mechanical codes for calculating the pump-induced distortions in the slabs, a database giving estimates of optics bulk/finish quality, and costing models of the laser/building. By exploiting parallel processing, we were able to consider approximately 750 possible designs per hour using a cluster of 28 workstations. For our optimization studies, we used a temporally shaped (ICF indirect drive) pulse producing at least 2.2 MJ and 600 TW in a 600 micron diameter hole at the target entrance plane. We varied as many as 20 design variables (e.g., slab counts, slab thickness, Nd concentration, amplifier pulse length) and applied as many as 40 constants (e.g., flashlamp voltage and fluence damage/filamentation at various points in the chain). We did not vary the number of beamlets (fixed at 192 or the aperture (fixed at 40 cm). We used three different optimization approaches: a variable metric algorithm, an exhaustive grid search of more than 50,000 candidate designs, and a parabolic interpolation scheme. All three approaches gave similar results. Moreover, a graphical analysis of the parameter scan data (analogous to sorting and pruning designs using a spreadsheet) has allowed us to understand why the optimizers eliminated alternate designs. The most inexpensive main-switch-boot slab configuration meeting the mission requirements and satisfying all constraints was 9-5-3. The cost of this configuration is approximately $DOL10M less than the 9-5-5 conceptual design. However, the NIF Project has chosen a slightly more expensive 11-0-7 configuration for continued Title I engineering because of its similarity to the Beamlet 11-0-5 design and a lower B-integral.

Proceedings Article | 8 December 1997 Paper

Characterization of the one-micron beam profile at the interface between the one-micron laser and the UV generation and transport subsystem

P. Renard, C. Clay Widmayer, Jerome Auerbach, Scott Haney, Mark Henesian, John Hunt, Janice Lawson, Kenneth Manes, David Milam, Charles Orth, Richard Sacks, David Speck, John Trenholme, Wade Williams

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294259

KEYWORDS: National Ignition Facility, Ultraviolet radiation, Chlorine, Spatial filters, Interfaces, Near field, Mathematical modeling, Optical filters, Image filtering, Optical components

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Proceedings Article | 8 December 1997 Paper

Modeling for deformable mirrors and the adaptive-optics optimization program

Mark Henesian, Scott Haney, M. Thomas, John Trenholme

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294258

KEYWORDS: Actuators, Mirrors, Adaptive optics, Deformable mirrors, Distortion, Wavefronts, Sensors, Optical amplifiers, National Ignition Facility, C++

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Proceedings Article | 8 December 1997 Paper

Propagation modeling in two transverse dimensions of the National Ignition Facility baseline performance

Richard Sacks, W. Williams, Mark Henesian, Charles Orth, Scott Haney, John Trenholme, Jerome Auerbach, Janice Lawson

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294341

KEYWORDS: National Ignition Facility, Performance modeling, Optimization (mathematics), Near field, Safety, Fusion energy, Databases, Modulation, Refractive index, Laser development

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Proceedings Article | 8 December 1995 Paper

Wiggler smoothing of laser beam intensity at ICF target surface

I. Bashkatov, A. Goltsov, A. Kolomiyskii, N. Kovalskii, V. Kryzhko, Leonid Magdich, Michael Pergament, V. Simonov, John Trenholme

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228262

KEYWORDS: Electro optics, Crystals, Resonators, Microwave radiation, Laser crystals, Electrodes, Streak cameras, Resistance, Control systems, Laser systems engineering

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Proceedings Article | 8 December 1995 Paper

Measurements of spontaneous emission redistribution phosphate glass

R. Bikmatov, Alexander Charikov, V. Chernyak, V. Kuznetsov, Michael Pergament, Ruslan Smirnov, Victor Sokolov, John Trenholme

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228276

KEYWORDS: Luminescence, Glasses, Doping, Neodymium, Optical filters, CCD cameras, Ions, Neodymium glass lasers, Solids, Absorption

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Proceedings Article | 8 December 1995 Paper

Perturbation theory for frequency doubling and tripling of electric field amplitude and phase ripples

Jerome Auerbach, David Eimerl, John Hunt, David Milam, John Trenholme, Peter Milonni

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228273

KEYWORDS: Laser optics, Second-harmonic generation, Phase shift keying, National Ignition Facility, Frequency conversion, Modulation, Optical simulations, Beam analyzers, Crystals

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Proceedings Article | 8 September 1995 Paper

Specification of optical components using the power spectral density function

Janice Lawson, C. Robert Wolfe, Kenneth Manes, John Trenholme, David Aikens, R. Edward English

Proceedings Volume 2536, (1995) https://doi.org/10.1117/12.218430

KEYWORDS: Wavefronts, Modulation, Spatial frequencies, Optical components, Surface roughness, Laser systems engineering, National Ignition Facility, Laser scattering, Scattering, Phase shift keying

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Proceedings Article | 1 May 1993 Paper

Phase screens for control of the focal irradiance of the Nova laser

Janice Lawson, Sham Dixit, David Eimerl, Mark Henesian, Kenneth Manes, Amber Morgan, Howard Powell, Ian Thomas, John Trenholme, Bruce Woods

Proceedings Volume 1870, (1993) https://doi.org/10.1117/12.154473

KEYWORDS: Computer generated holography, Binary data, Fusion energy, Silica, Polymethylmethacrylate, Polymers, Coating, Deep ultraviolet, Resistance, Etching

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Proceedings Article | 1 July 1991 Paper

Upgrade of the LLNL Nova laser for inertial confinement fusion

John Murray, John Trenholme, John Hunt, Donald Frank, W. Howard Lowdermilk, E. Storm

Proceedings Volume 1410, (1991) https://doi.org/10.1117/12.43584

KEYWORDS: Optical amplifiers, Mirrors, Glasses, Crystals, Laser damage threshold, Optical coatings, Pulsed laser operation, Laser glasses, Modulation, Spatial filters

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Showing 5 of 18 publications

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