Dr. Daniel R. Neal Profile

Dr. Daniel R. Neal

CEO at WaveFront Dynamics Inc

SPIE Involvement:

Author

Publications (28)

SPIE Journal Paper | 30 November 2022 Open Access

Open Access

Dynamic aberrometer/topographer designed for clinical measurement and treatment of highly aberrated eyes

Daniel Neal, Xifeng Xiao, Richard Copland, Lyle Kordonowy, Dan Hamrick, Daniel Medina, John Dixson, Phillip Riera, Paul Pulaski, Tristan Turner, Jeff Kolberg, Ron Rammage, Steve Farrer, Dean Rusk, Matt Haugo

OE, Vol. 61, Issue 12, 121808, (November 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.12.121808

KEYWORDS: Equipment, Eye, Wavefronts, Refraction, Wavefront sensors, Cornea, Optical spheres, Optical engineering, Monochromatic aberrations, Imaging systems

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The human eye is a complex optical system with multiple elements. It is aspheric, nonsymmetric, and time dependent; yet, overall it has incredible performance. There have been various instruments developed over the years to measure and then to guide treatment to correct for ocular aberrations. As the development of these instruments (and treatments) has progressed, we have sought to correct more difficult cases, which may be more aberrated, time-dependent, or difficult in some other way. To this end, we have developed a new dynamic aberrometer that expands the boundaries of measurement capability with the aim of measuring and treating more difficult cases. This aberrometer has been designed that incorporates high-resolution Shack–Hartmann wavefront sensing, full gradient (spot) corneal topography, dynamic acquisition, and a subjective digital refractometer. This instrument is designed to measure extremely high aberrations and to provide information for treatment in multiple modalities. A small clinical study was conducted with subjects ranging from 23 to 64 years old to evaluate the effectiveness of the dynamic analysis at selecting a refraction. Examples are presented for measurements with keratoconus, irregular corneas, and tear-film irregularity. In the clinical study, young subjects showed an overall +0.27 D reduction in instrument induced myopia using dynamic measurement compared to a snapshot. The instrument has a large dynamic range for measuring subjects with keratoconus and other aberrated corneal conditions. The new instrument is effective at providing information needed for treatment in multiple modalities. The subjective digital refractometer corrects the fixation target for the objectively measured low-order aberrations (defocus and astigmatism). This provides immediate subjective feedback on the objective refraction and, with the ability to manually adjust the refraction parameters, the ability to compare objective and subjective refractions in the same setting.

Proceedings Article | 19 February 2020 Paper

Paper

Estimating visual acuity from a single wavefront measurement

Derek Nankivil, Thomas Raymond, Greg Hofmann, Daniel Neal

Proceedings Volume 11218, 1121822 (2020) https://doi.org/10.1117/12.2548645

KEYWORDS: Wavefronts, Modulation transfer functions, Refraction, Visualization, Eye, Point spread functions, Image quality, Visual optics

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Proceedings Article | 7 July 2006 Paper

Paper

The JWST infrared Scanning Shack Hartman System: a new in-process way to measure large mirrors during optical fabrication at Tinsley

Craig Kiikka, Daniel Neal, John Kincade, Robert Bernier, Tony Hull, David Chaney, Steve Farrer, John Dixson, Avery Causey, Steve Strohl

Proceedings Volume 6265, 62653D (2006) https://doi.org/10.1117/12.672887

KEYWORDS: Mirrors, Wavefronts, Wavefront sensors, Sensors, Surface finishing, James Webb Space Telescope, Metrology, Optical fabrication, Telescopes, Infrared radiation

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Proceedings Article | 14 October 2004 Paper

Paper

Measurement of lens focal length using multicurvature analysis of Shack-Hartmann wavefront data

Daniel Neal, R. James Copland, David Neal, Daniel Topa, Phillip Riera

Proceedings Volume 5523, (2004) https://doi.org/10.1117/12.561772

KEYWORDS: Wavefront sensors, Wavefronts, Distance measurement, Collimation, Error analysis, Sensors, Monochromatic aberrations, Charge-coupled devices, Manufacturing, Optical testing

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SPIE Journal Paper | 1 March 2004

Metrology of thin transparent optics using Shack-Hartmann wavefront sensing

Craig Forest, Claude Canizares, Daniel Neal, Michael McGuirk, Mark Schattenburg

OE, Vol. 43, Issue 03, (March 2004) https://doi.org/10.1117/12.10.1117/1.1645256

KEYWORDS: Wavefront sensors, Sensors, Metrology, Wavefronts, Reflection, Lamps, Charge-coupled devices, Optical filters, Glasses, Optical engineering

Proceedings Article | 11 December 2003 Paper

Paper

Testing highly aberrated large optics with a Shack-Hartmann wavefront sensor

Daniel Neal, Paul Pulaski, Thomas Raymond, David Neal, Quandou Wang, Ulf Griesmann

Proceedings Volume 5162, (2003) https://doi.org/10.1117/12.510795

KEYWORDS: Semiconducting wafers, Wavefronts, Wavefront sensors, Optical testing, Wafer-level optics, Sensors, Mirrors, Turbulence, Interferometers, Silica

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Proceedings Article | 11 November 2002 Paper

Paper

Application of Shack-Hartmann wavefront sensing technology to transmissive optic metrology

Ron Rammage, Daniel Neal, Richard Copland

Proceedings Volume 4779, (2002) https://doi.org/10.1117/12.451734

KEYWORDS: Wavefront sensors, Wavefronts, Sensors, Optical testing, Spatial resolution, Light sources, Contact lenses, Cameras, Refraction, Water

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Proceedings Article | 11 November 2002 Paper

Paper

Shack-Hartmann wavefront sensor precision and accuracy

Daniel Neal, James Copland, David Neal

Proceedings Volume 4779, (2002) https://doi.org/10.1117/12.450850

KEYWORDS: Wavefronts, Sensors, Wavefront sensors, Error analysis, Detector arrays, Cameras, Charge-coupled devices, Calibration, Standards development, CCD image sensors

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Proceedings Article | 4 November 2002 Paper

Paper

High-speed noninterferometric nanotopographic characterization of Si wafer surfaces

Thomas Raymond, Daniel Neal, Daniel Topa, Tony Schmitz

Proceedings Volume 4809, (2002) https://doi.org/10.1117/12.450990

KEYWORDS: Semiconducting wafers, Silicon, Polishing, Sensors, Wafer-level optics, Surface finishing, Wavefronts, Interferometers, Interferometry, Manufacturing

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Proceedings Article | 16 October 2002 Paper

Paper

Measurement of aberrations in microlenses using a Shack-Hartmann wavefront sensor

Paul Pulaski, James Roller, Daniel Neal, Keith Ratte

Proceedings Volume 4767, (2002) https://doi.org/10.1117/12.451325

KEYWORDS: Wavefronts, Wavefront sensors, Silicon, Silica, Microlens, Microlens array, Sensors, Semiconductor lasers, Collimation, Reflection

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Proceedings Article | 27 December 2001 Paper

Paper

Measurement of the dynamic deformation of a high-frequency scanning mirror using a Shack-Hartmann wavefront sensor

Margaret Brown, Timothy Gong, Daniel Neal, James Roller, Selso Luanava, Hakan Urey

Proceedings Volume 4451, (2001) https://doi.org/10.1117/12.453645

KEYWORDS: Mirrors, Wavefront sensors, Wavefronts, Interferometers, Finite element methods, CCD image sensors, Sensors, CCD cameras, Semiconductor lasers, Electronics

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Proceedings Article | 27 December 2001 Paper

Paper

Use of beam parameters in optical component testing

Daniel Neal, James Gruetzner, James Roller

Proceedings Volume 4451, (2001) https://doi.org/10.1117/12.453638

KEYWORDS: Wavefronts, Wavefront sensors, Optical testing, Optical components, Fourier transforms, Cameras, Optics manufacturing, Quality measurement, Wave propagation, Beam propagation method

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Proceedings Article | 7 June 2001 Paper

Paper

Effect of lenslet resolution on the accuracy of ocular wavefront measurements

Daniel Neal, Daniel Topa, James Copland

Proceedings Volume 4245, (2001) https://doi.org/10.1117/12.429285

KEYWORDS: Wavefronts, Eye, Wavefront sensors, Zernike polynomials, Optical spheres, Optical resolution, Adaptive optics, Deformable mirrors, Sensors, Charge-coupled devices

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Proceedings Article | 18 November 1998 Paper

Paper

Characterization of infrared laser systems

Daniel Neal, Darrell Armstrong, W. Tim Turner

Proceedings Volume 3437, (1998) https://doi.org/10.1117/12.331333

KEYWORDS: Wavefront sensors, Sensors, Cameras, Wavefronts, Infrared sensors, Infrared cameras, Lenses, Telescopes, Etching, Laser optics

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Proceedings Article | 21 November 1997 Paper

Paper

Wavefront sensor testing in hypersonic flows using a laser-spark guide star

Daniel Neal, Darrell Armstrong, Eric Hedlund, Melissa Lederer, Arnold Collier, Charles Spring, James Gruetzner, Gregory Hebner, Justin Mansell

Proceedings Volume 3172, (1997) https://doi.org/10.1117/12.293400

KEYWORDS: Wavefront sensors, Sensors, Wavefronts, Wind energy, Stars, Laser optics, Laser guide stars, Missiles, Laser damage threshold, Pulsed laser operation

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Proceedings Article | 27 March 1997 Paper

Paper

Wavefront sensors for control and processing monitoring in optics manufacture

Daniel Neal, Darrell Armstrong, W. Tim Turner

Proceedings Volume 2993, (1997) https://doi.org/10.1117/12.270030

KEYWORDS: Wavefronts, Wavefront sensors, Optical testing, Sensors, Optics manufacturing, Beam expanders, Calibration, Optical components, Mirrors, Interferometers

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Proceedings Article | 20 November 1996 Paper

Paper

Amplitude and phase beam characterization using a two-dimensional wavefront sensor

Daniel Neal, William Alford, James Gruetzner, Mial Warren

Proceedings Volume 2870, (1996) https://doi.org/10.1117/12.259947

KEYWORDS: Wavefronts, Wavefront sensors, Sensors, Calibration, Fourier transforms, Photomasks, Beam propagation method, Gaussian beams, Diffraction, Laser beam propagation

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Proceedings Article | 29 September 1995 Paper

Paper

One-dimensional wavefront sensor development for tomographic flow measurements

Daniel Neal, Robert Pierson, E. Chen, Kenneth Bishop, Lenore McMackin

Proceedings Volume 2546, (1995) https://doi.org/10.1117/12.221539

KEYWORDS: Wavefront sensors, Sensors, Tomography, Wavefronts, Detector arrays, Diffraction, Lens design, Computer simulations, Performance modeling, Cameras

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Proceedings Article | 25 August 1995 Paper

Paper

Optical and control modeling for adaptive beam-combining experiments

James Gruetzner, Steve Tucker, Daniel Neal, A. Bentley, Kelly Simmons-Potter

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217728

KEYWORDS: Diffraction, Systems modeling, Adaptive optics, Control systems, Performance modeling, Mirrors, Control systems design, Sensors, Optics manufacturing, Algorithm development

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Proceedings Article | 25 August 1995 Paper

Paper

Specialized wavefront sensors for adaptive optics

Daniel Neal, Justin Mansell, James Gruetzner, R. Morgan, Mial Warren

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217751

KEYWORDS: Sensors, Diffraction, Wavefront sensors, Computer aided design, Adaptive optics, Deformable mirrors, Neural networks, Wavefronts, Etching, Lens design

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Proceedings Article | 25 August 1995 Paper

Paper

Multisegment coherent beam combining

Daniel Neal, Steve Tucker, R. Morgan, Tony Smith, Mial Warren, James Gruetzner, R. Rosenthal, A. Bentley

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217727

KEYWORDS: Sensors, Diffraction, Adaptive optics, Mirrors, Image segmentation, CCD image sensors, Wavefront sensors, CCD cameras, Image sensors, Optical simulations

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Proceedings Article | 30 June 1994 Paper

Paper

Metal-ion spin-on glasses: novel materials for active waveguides

Carol Ashby, Charles Sullivan, G. Allen Vawter, John Hohimer, G. Ronald Hadley, Daniel Neal

Proceedings Volume 2146, (1994) https://doi.org/10.1117/12.178534

KEYWORDS: Waveguides, Glasses, Semiconductor lasers, Luminescence, Laser applications, Optical amplifiers, Semiconducting wafers, Laser development, Ions, Refractive index

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Proceedings Article | 31 May 1994 Paper

Paper

Multitiered wavefront sensor using binary optics

Daniel Neal, Mial Warren, James Gruetzner, Tony Smith, R. Rosenthal, T. McKechnie

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176045

KEYWORDS: Wavefront sensors, Diffraction, Adaptive optics, Wavefronts, Sensors, Photomasks, Wavefront reconstruction, Mirrors, Astronomy, Computer aided design

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Proceedings Article | 1 May 1994 Paper

Paper

System requirements for laser power beaming to geosynchronous satellites

Robert Neal, T. McKechnie, Daniel Neal

Proceedings Volume 2121, (1994) https://doi.org/10.1117/12.174183

KEYWORDS: Satellites, Wavefronts, Laser systems engineering, Adaptive optics, Telescopes, Laser applications, Sun, Thermal blooming, Atmospheric turbulence, Atmospheric propagation

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Proceedings Article | 2 December 1993 Paper

Paper

Wavefront sensors for optical diagnostics in fluid mechanics: application to heated flow, turbulence, and droplet evaporation

Daniel Neal, Timothy O'Hern, John Torczynski, Mial Warren, Randy Shul, T. McKechnie

Proceedings Volume 2005, (1993) https://doi.org/10.1117/12.163703

KEYWORDS: Wavefront sensors, Wavefronts, Turbulence, Sensors, Mechanics, Fluid dynamics, Spatial resolution, Data acquisition, Data analysis, Temperature metrology

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Proceedings Article | 25 August 1993 Paper

Paper

Multiple laser beam combining and phasing using closed-loop control

Daniel Neal, Tony Smith, G. Eisler, J. Wilcoxen, R. Rosenthal

Proceedings Volume 1920, (1993) https://doi.org/10.1117/12.152661

KEYWORDS: Sensors, Wavefront sensors, Mirrors, Actuators, Control systems, Image segmentation, Ferroelectric materials, Algorithm development, Wavefronts, Photodiodes

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Proceedings Article | 1 December 1991 Paper

Paper

Astigmatic unstable resonator with an intracavity deformable mirror

Daniel Neal, Pat McMillin, Robert Michie

Proceedings Volume 1542, (1991) https://doi.org/10.1117/12.48828

KEYWORDS: Resonators, Deformable mirrors, Wavefronts, Mirrors, Actuators, Beam expanders, Pulsed laser operation, Refraction, Control systems, Ray tracing

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SPIE Journal Paper | 1 November 1990

Time-resolved wavefront measurements and analyses for a pulsed, nuclear-reactor-pumped laser gain region

Daniel Neal, John Torczynski, William Sweatt

OE, Vol. 29, Issue 11, (November 1990) https://doi.org/10.1117/12.10.1117/12.55732

KEYWORDS: Wavefronts, Laser beam diagnostics, Cameras, Motion models, Pulsed laser operation, Laser resonators, Resonators, Laser development, Gas lasers, Calibration

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Showing 5 of 28 publications

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