Dr. James J. De Yoreo Profile

Dr. James J. De Yoreo

Physicist at Lawrence Livermore National Lab

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Author

Publications (21)

Proceedings Article | 4 November 2002 Paper

Fabrication of luminescent nanostructures by dip-pen nanolithography

Aleksandr Noy, Abigail Miller, Jennifer Klare, Brandon Weeks, Bruce Woods, James De Yoreo

Proceedings Volume 4809, (2002) https://doi.org/10.1117/12.451184

KEYWORDS: Scanning probe lithography, Nanolithography, Molecules, Polymers, Proteins, Confocal microscopy, Glasses, Atomic force microscopy, Visualization, Nanowires

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Proceedings Article | 3 March 2000 Paper

Scatter loss from environmental degradation of KDP crystals

Elizabeth Wheeler, J. McWhirter, Pamela Whitman, C. Thorsness, James De Yoreo, Ian Thomas, M. Hester

Proceedings Volume 3902, (2000) https://doi.org/10.1117/12.379328

KEYWORDS: Etching, Crystals, Scattering, Coating, Light scattering, Humidity, Laser scattering, Sol-gels, Diffusion, Silicon

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Proceedings Article | 23 July 1999 Paper

Frequency converter development for the National Ignition Facility

Paul Wegner, Jerome Auerbach, Charles Barker, Scott Burkhart, Scott Couture, Jim DeYoreo, R. Hibbard, Lisa Liou, Mary Norton, Pamela Whitman, Lloyd Hackel

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354152

KEYWORDS: Crystals, National Ignition Facility, Error analysis, Laser crystals, Data modeling, Frequency conversion, Tolerancing, Frequency converters, Performance modeling, Nonlinear crystals

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Proceedings Article | 23 July 1999 Paper

Modeling of frequency doubling and tripling with converter refractive index spatial nonuniformities due to gravitational sag

Jerome Auerbach, Charles Barker, Scott Couture, David Eimerl, Jim DeYoreo, Lloyd Hackel, R. Hibbard, Lisa Liou, Mary Norton, S. Perfect, Paul Wegner

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354161

KEYWORDS: Crystals, Refractive index, Second-harmonic generation, Frequency conversion, Performance modeling, National Ignition Facility, Surface finishing, Nonlinear crystals, Phase velocity, Phase matching

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Proceedings Article | 23 July 1999 Paper

Overview of recent KDP damage experiments and implications for NIF tripler performance

Michael Runkel, Richard Jennings, Jim DeYoreo, Walter Sell, David Milam, Natalia Zaitseva, L. Carmen, Wade Williams

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354149

KEYWORDS: National Ignition Facility, Crystals, Annealing, Failure analysis, Laser damage threshold, Thermal effects, Laser crystals, Data modeling, Raster graphics, Laser optics

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Proceedings Article | 26 May 1999 Paper

Steady-state and transient defect populations in KH2PO4 subsequent to high-fluence laser irradiation

Stavros Demos, Michael Staggs, Harry Radousky, James De Yoreo

Proceedings Volume 3610, (1999) https://doi.org/10.1117/12.349237

KEYWORDS: Crystals, Raman scattering, Laser crystals, Luminescence, Absorption, Laser irradiation, High power lasers, Raman spectroscopy, Laser beam diagnostics, Ions

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Proceedings Article | 7 April 1999 Paper

Predicting bulk damage in NIF triple harmonic generators

Michael Runkel, W. Williams, James De Yoreo

Proceedings Volume 3578, (1999) https://doi.org/10.1117/12.344456

KEYWORDS: National Ignition Facility, Failure analysis, Laser induced damage, Laser damage threshold, Crystals, Laser crystals, Laser optics, Data modeling, Reliability, Information operations

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Proceedings Article | 7 April 1999 Paper

Observation of photoexcited emission clusters in the bulk of KDP and laser conditioning under 355-nm irradiation

Stavros Demos, Michael Staggs, Ming Yan, Harry Radousky, James De Yoreo

Proceedings Volume 3578, (1999) https://doi.org/10.1117/12.344402

KEYWORDS: Crystals, Luminescence, Laser crystals, Active optics, Imaging systems, Laser irradiation, Laser induced damage, High power lasers, Absorption, Ions

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Proceedings Article | 20 April 1998 Paper

Temperature and spectral investigation of bulk KDP below damage using 355-nm laser irradiation

Stavros Demos, Ming Yan, Michael Staggs, Bruce Woods, Zhouling Wu, Harry Radousky, Jim DeYoreo

Proceedings Volume 3244, (1998) https://doi.org/10.1117/12.307029

KEYWORDS: Laser irradiation, Crystals, High temperature raman spectroscopy, Laser crystals, Raman spectroscopy, Temperature metrology, Visible radiation, Near infrared

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Proceedings Article | 20 April 1998 Paper

Photothermal mapping of defects in the study of bulk damage in KDP

Bruce Woods, Ming Yan, Jim DeYoreo, Mark Kozlowski, Harry Radousky, Zhouling Wu

Proceedings Volume 3244, (1998) https://doi.org/10.1117/12.307033

KEYWORDS: Crystals, National Ignition Facility, Laser damage threshold, Frequency conversion, Optical switching, Laser crystals, Laser processing, Diagnostics, Light scattering, Absorption

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Proceedings Article | 20 April 1998 Paper

Laser conditioning study of KDP on the optical sciences laser using large area beams

Michael Runkel, Jim DeYoreo, Walter Sell, David Milam

Proceedings Volume 3244, (1998) https://doi.org/10.1117/12.307034

KEYWORDS: Laser optics

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Considerable attention has been paid over the years to the problem of growing high purity KDP and KD*P to meet damage threshold requirements on succeeding generations of inertial confinement fusion lasers at LLNL. While damage thresholds for these materials have increased over time, the current National Ignition Facility (NIP) maximum fluence requirement (redline) for KD*P frequency triplers of 14.3 J/cm2 at 351 nm, 3 ns has not been reached without laser (pre)conditioning. It is reasonable to assume that. despite the rapid increase in damage thresholds for rapidly grown crystals, ·a program of large scale conditioning of the 192 NIF triplers will be required. Small area ramp (R/1) tests on single sites indicate that KDP damage thresholds can be raised on average up to 1.5X the unconditioned values. Unpublished LLNL 3m raster conditioning studies on KDP, however, have not conclusively shown that off-line conditioning is feasible for KD*P. Consequently, investigating the feasibility of on-line conditioning of NIF triplers at 3m has become a high priority for the KDP damage group at LLNL. To investigate the feasibility of on-line conditioning we performed a series of experiments using the Optical Sciences Laser (OSL) on numerous samples of conventional and rapid growth KDP and KD*P. The experiment entailed exposing sites on each sample to a range of ramped shot (Nil) sequences starting at average fluences of -2 J/cm2 (in a 7 mm "top hat" beam @ 351 nm, 3 ns) up to peak fluences of approximately 13 J/cm2• Test results indicated that the most effective conditioning procedure entailed a 7-8 shot ramp starting at 2 J/cm2 and ending at 12-13 J/cm2• The pinpoint onset fluence for the 8/1 tests was 1.4 times that of the unconditioned site. Damage evolution appears to be exponential as a function of increasing fluence. When damage occurs after conditioning however, pinpoint density evolution exhibits a greater slope than less conditioned sites. The overall reduction in the total pinpoint number can be as high as 300X. Despite laser conditioning , the pinpoint onset for the samples considered is below the NIF redline fluence of 14.3 J/cm2• In addition, the exponential pinpoint evolution curves indicate that damage levels at NIF redline fluences will be on the order of 1 Q4 pinpoints/mm3• 1bis suggests that there will be significant damage in NIF triplers, however, substantial damage has not been observed in the large Beamlet tripler (conventionally grown KD*P) under similar exposure conditions. By applying the OSL damage evolution curves to model NIF THG output spatial profiles it is possible to show damage in NIF triplers will be slight, consisting of isolated clusters with a few pinpoints at high fluence portions of the beam. This prediction has been verified by scatter mapping the 37 cm Beamlet tripler crystal. These results will be discussed in a future memo. These results indicate the feasibility of on-line conditioning for the NIF laser. Keywords: KDP, DKDP, KD*P, bulk laser damage, laser conditioning

Proceedings Article | 20 April 1998 Paper

Effect of impurities and stress on the damage distributions of rapidly grown KDP crystals

Michael Runkel, Ming Yan, Jim DeYoreo, Natalia Zaitseva

Proceedings Volume 3244, (1998) https://doi.org/10.1117/12.307046

KEYWORDS: Crystals, Laser damage threshold, National Ignition Facility, Laser induced damage, Laser crystals, Laser applications, Laser ablation, Laser development, Diagnostic tests, Diagnostics

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Proceedings Article | 8 December 1997 Paper

Rapid growth of large-scale (40-55 cm) KDP crystals

Natalia Zaitseva, James De Yoreo, Martin DeHaven, Russell Vital, L. Carman, H. Spears

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294327

KEYWORDS: Crystals, National Ignition Facility, Laser crystals, Laser damage threshold, Adaptive optics, Glasses, Photography, Optical filters, Distortion, Optical testing

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Proceedings Article | 13 May 1997 Paper

Investigations of laser damage in KDP using light-scattering techniques

Bruce Woods, Michael Runkel, Ming Yan, Michael Staggs, Natalia Zaitseva, Mark Kozlowski, James De Yoreo

Proceedings Volume 2966, (1997) https://doi.org/10.1117/12.274275

KEYWORDS: Crystals, Laser damage threshold, Light scattering, Diagnostics, Laser crystals, Thermal effects, Birefringence, Scattering, National Ignition Facility, Laser scattering

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Interest in producing high damage threshold KH₂PO₄ (KDP) and (D_xH_1-x)₂PO₄ (DKDP) for frequency conversion and optical switching applications is driven by the requirements of the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory. At present only the best crystals meet the NIF system requirements at the third harmonic and only after a laser conditioning process. Neither the mechanism for damage in bulk KDP nor the mechanism for conditioning ins understood. As part of ta development effort to increase the damage thresholds of KDP and DKDP, we have been developing techniques to pinpoint the locations where damage will initiate in the bulk material. After we find these locations we will use other measurement techniques to determine how these locations differ from the other surrounding materials and why they cause damage. This will allow crystal growers to focus their efforts to improve damage thresholds. Historically, damage thresholds have increased it is believed as a consequence of increased purity of the growth solution and through the use of constant filtration during the growth process. As a result we believe that damage is caused by defects in the crystals and have conducted a series of experiments using light scatter to locate these defects and to determine when and where damage occurs. In this paper we present results which show a low correlation between light scatter from bulk defects in KDP and the initiation sites for damage. We have also studied the effects of thermal conditioning on light scatter, strain induced birefringence and damage threshold. We have seen evidence that regions of high strain also exhibit lower damage threshold than the surrounding lower strain material. When thermally conditioned, these crystals show a decrease in some of the strong linear scattering features and a decrease in the strain birefringence while the damage threshold in these regions increased to that of the surrounding bulk material.

Proceedings Article | 13 May 1997 Paper

Investigation of impurities and laser-induced damage in the growth sectors of rapidly grown KDP crystals

Ming Yan, Richard Torres, Michael Runkel, Bruce Woods, Ian Hutcheon, Natalia Zaitseva, James De Yoreo

Proceedings Volume 2966, (1997) https://doi.org/10.1117/12.274277

KEYWORDS: Crystals, Absorption, Laser induced damage, Laser damage threshold, Laser crystals, Ultraviolet radiation, Annealing, Light scattering, Nonlinear crystals, Laser scattering

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Proceedings Article | 27 May 1996 Paper

Analysis of high-resolution scatter images from laser damage experiments performed on KDP

Michael Runkel, Bruce Woods, Ming Yan, James De Yoreo, Mark Kozlowski

Proceedings Volume 2714, (1996) https://doi.org/10.1117/12.240397

KEYWORDS: Crystals, Laser damage threshold, Diagnostics, Prisms, Laser induced damage, Laser scattering, Laser crystals, National Ignition Facility, Laser beam diagnostics, Microscopes

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Proceedings Article | 27 May 1996 Paper

Impurity contamination in fast-grown KDP

Ming Yan, James De Yoreo, Natalia Zaitseva, Richard Torres

Proceedings Volume 2714, (1996) https://doi.org/10.1117/12.240410

KEYWORDS: Contamination, Crystals, Nonlinear crystals, Crystallography, Absorption spectroscopy, Potassium, Nonlinear optical materials, Frequency conversion, Laser applications, Laser induced damage

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Proceedings Article | 1 September 1995 Paper

Optical scatter as a diagnostic tool for studying bulk defects which cause laser damage in conventional and rapid-growth KDP and DKDP

Bruce Woods, Michael Runkel, Ming Yan, James De Yoreo, Mark Kozlowski

Proceedings Volume 2541, (1995) https://doi.org/10.1117/12.218328

KEYWORDS: Crystals, Laser crystals, Laser damage threshold, Laser induced damage, Laser scattering, Laser beam diagnostics, Diagnostics, Scattering, National Ignition Facility, Optical damage

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Proceedings Article | 28 July 1994 Paper

Thermal and laser conditioning of production and rapid growth KDP and KD*P crystals

L. Jeffrey Atherton, Frank Rainer, James De Yoreo, Ian Thomas, N. Zaitseva, Frank De Marco

Proceedings Volume 2114, (1994) https://doi.org/10.1117/12.180912

KEYWORDS: Crystals, Laser damage threshold, Laser crystals, National Ignition Facility, Annealing, Raster graphics, Solid state lasers, Potassium, Analog electronics, Absorption

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Proceedings Article | 24 June 1993 Paper

Laser damage to production- and research-grade KDP crystals

Frank Rainer, L. Jeffrey Atherton, James De Yoreo

Proceedings Volume 1848, (1993) https://doi.org/10.1117/12.147418

KEYWORDS: Crystals, Laser damage threshold, Laser crystals, Laser induced damage, Surface finishing, Polishing, Copper, Potassium, Laser systems engineering, Microscopes

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Proceedings Article | 1 December 1991 Paper

Investigation of strain birefringence and wavefront distortion in 001 plates of KD2PO4

James De Yoreo, Bruce Woods

Proceedings Volume 1561, (1991) https://doi.org/10.1117/12.50753

KEYWORDS: Crystals, Wavefront distortions, Birefringence, Crystal optics, Protactinium, Electro optics, Frequency conversion, Polarization, Signal attenuation, Laser crystals

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Showing 5 of 21 publications

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