Dr. C. Robert Wolfe Profile

Dr. C. Robert Wolfe

Vice President/Engineering

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Author

Publications (14)

Proceedings Article | 10 September 2003 Paper

Reducing speckle and grain in BlackScreen

C. Robert Wolfe, Ken Kinosian, Kathy Lewis, Dennis Vance, John Vu

Proceedings Volume 5080, (2003) https://doi.org/10.1117/12.488712

KEYWORDS: Speckle, Projection systems, Spatial coherence, Fresnel lenses, Digital imaging, Air contamination, Geometrical optics, Image analysis, Visual system, Image resolution

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Proceedings Article | 28 March 2003 Paper

Quantitative model for calculating viewing angle of projection systems

C. Robert Wolfe

Proceedings Volume 5002, (2003) https://doi.org/10.1117/12.473842

KEYWORDS: Projection systems, Reflectivity, Systems modeling, Reflection, Light, Light scattering, Scattering, Image transmission, Mathematical modeling, Performance modeling

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Proceedings Article | 28 March 2003 Paper

Characterization of BlackScreen for rear-projection television

C. Robert Wolfe, M. Esguerra, Kathy Lewis, Ken Kinosian, B. Knutson, S. Suniga, Dennis Vance, John Vu

Proceedings Volume 5002, (2003) https://doi.org/10.1117/12.473840

KEYWORDS: Projection systems, Televisions, CRTs, Visibility, Speckle, Optics manufacturing, Collimation, Eye, Fresnel lenses, Reflection

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Proceedings Article | 28 August 2002 Paper

Characterization of on-screen image noise in BlackScreen, a high-contrast high-resolution rear-projection screen for cockpit avionics displays

C. Robert Wolfe

Proceedings Volume 4712, (2002) https://doi.org/10.1117/12.480956

KEYWORDS: Speckle, Projection systems, Cockpit avionics, Cockpit displays, Photometry, Image enhancement, Image analysis, Digital imaging, Visual system, Image resolution

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Proceedings Article | 20 November 1996 Paper

Measuring the spatial frequency transfer function of phase-measuring interferometers for laser optics

C. Robert Wolfe, John Downie, Janice Lawson

Proceedings Volume 2870, (1996) https://doi.org/10.1117/12.259943

KEYWORDS: Wavefronts, Interferometers, Spatial frequencies, Modulation, Phase interferometry, National Ignition Facility, Sensors, Laser optics, Calibration, Optical components

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Proceedings Article | 19 August 1996 Paper

Power spectral density specifications for high-power laser systems

Janice Lawson, David Aikens, R. Edward English, C. Robert Wolfe

Proceedings Volume 2775, (1996) https://doi.org/10.1117/12.246761

KEYWORDS: Wavefronts, Spatial frequencies, National Ignition Facility, Laser systems engineering, Optical components, Optical transfer functions, Modulation, High power lasers, Surface roughness, Interferometers

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Proceedings Article | 8 December 1995 Paper

Measurement and analysis of wavefront structure from large-aperture ICF optics

C. Robert Wolfe, Janice Lawson

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228288

KEYWORDS: Wavefronts, Optical components, Modulation, National Ignition Facility, Data modeling, Interferometers, Sensors, Lenses, Wave propagation, Spatial resolution

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This paper discusses the techniques, developed over the past year, for high spatial resolution measurement and analysis of the transmitted and/or reflected wavefront of large aperture ICF optical components. Parts up to 400 mm by 750 mm have been measured and include: laser slabs, windows, KDP crystals and lenses. The measurements were performed using state-of- the-art commercial phase shifting interferometers at a wavelength of 633 micrometer. Both 1 and 2-D Fourier analysis have been used to characterize the wavefront; specifically the power spectral density (PSD) function was calculated. The PSDs of several precision optical components are shown. The PSD(nu) is proportional to the (amplitude)² of components of the Fourier frequency spectrum. The PSD describes the scattered intensity and direction as a function of scattering angle in the wavefront. The capability of commercial software is limited to 1-D Fourier analysis only. We are developing our own 2-D analysis capability in support of work to revise specifications for NIF optics. Two-dimensional analysis uses the entire wavefront phase map to construct 2-D PSD functions. We have been able to increase the signal-to-noise relative to 1-D and can observe very subtle wavefront structure. The physics of the NIF laser design dictate partitioning the wavefront into three regimes of spatial wavelength (or spatial frequency). We discuss the data in terms of the following three scale length regimes: (1) short scale, or 'micro roughness,' having scale lengths less than 120 micrometer; (2) mid-spatial scale, with scale lengths from 0.12 to 33 mm; and (3) long scale, or conventional 'optical figure/curvature,' having scale lengths greater than 33 mm. Regular repetitive wavefront structure has been observed in all three regimes, ranging from 10 micrometer to 100 mm in scale length. The magnitude of these structures are typically from lambda/100 to lambda/20. Structure has been detected in optical materials and on the surfaces of finished parts. We believe the sources of these structures are small fabrication errors. The Modeling Group at LLNL is using this data in beam propagation codes to assist in optimizing laser system design and to develop optics specifications for the NIF.

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 | 8 September 1995 Paper

Measurement of wavefront structure from large-aperture optical components by phase-shifting interferometry

C. Robert Wolfe, Janice Lawson, Marcia Kellam, Richard Maney, Anthony Demiris

Proceedings Volume 2536, (1995) https://doi.org/10.1117/12.218420

KEYWORDS: Wavefronts, Optical components, Modulation, National Ignition Facility, Sensors, Interferometers, Phase interferometry, Spatial resolution, Wave propagation, Metrology

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Proceedings Article | 2 August 1995 Paper

Use of power spectral density (PSD) functions in specifying optics for the National Ignition Facility

David Aikens, C. Robert Wolfe, Janice Lawson

Proceedings Volume 2576, (1995) https://doi.org/10.1117/12.215604

KEYWORDS: Wavefronts, National Ignition Facility, Spatial frequencies, Fusion energy, Laser systems engineering, Optical components, Modulation, Optical amplifiers, Laser energy, Adaptive optics

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Proceedings Article | 23 June 1995 Paper

Database of wavefront measurements for laser system modeling, optical component development, and fabrication process qualification

C. Robert Wolfe, Janice Lawson, David Aikens, R. Edward English

Proceedings Volume 2545, (1995) https://doi.org/10.1117/12.212651

KEYWORDS: Wavefronts, National Ignition Facility, Optical components, Databases, Interferometers, Data modeling, Laser optics, Systems modeling, Phase measurement, Modulation

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Proceedings Article | 1 June 1991 Paper

Damage resistant optics for a megajoule solid state laser

Jack Campbell, Frank Rainer, Mark Kozlowski, C. Robert Wolfe, Ian Thomas, Fred Milanovich

Proceedings Volume 1441, (1991) https://doi.org/10.1117/12.57232

KEYWORDS: Laser damage threshold, Glasses, Laser induced damage, Laser glasses, Optical amplifiers, Polishing, Surface finishing, Silica, Resonators, Solid state lasers

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Proceedings Article | 1 November 1990 Paper

Design and fabrication of high damage threshold turning mirrors for the Nova laser

C. Robert Wolfe, Mark Kozlowski, F. Marchi, Frank Rainer, Edward Enemark

Proceedings Volume 1334, (1990) https://doi.org/10.1117/12.22838

KEYWORDS: Mirrors, Laser damage threshold, Coating, Reflectivity, Raster graphics, Thin films, Optical engineering, Laser induced damage, Objectives, Multilayers

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Proceedings Article | 1 November 1990 Paper

Laser conditioning of optical thin films

C. Wolfe

Proceedings Volume 1438, 143810 (1990) https://doi.org/10.1117/12.2294445

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Showing 5 of 14 publications

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