Dr. Xifeng Xiao Profile

Dr. Xifeng Xiao

Principal Optical Engineer at WaveFront Dynamics

SPIE Involvement:

Author

Area of Expertise:

Free Space Laser Communication , Laser design , Remote sensing , Wave Optics Simulation

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 | 16 September 2020 Presentation + Paper

Presentation + Paper

Statistical properties of speckles in imaging through deep turbulence

Xifeng Xiao

Proceedings Volume 11508, 1150809 (2020) https://doi.org/10.1117/12.2569062

KEYWORDS: Turbulence, Atmospheric propagation, Speckle imaging, Laser beam propagation, Optical simulations, Wave propagation, Numerical simulations, Speckle, Free space optical communications, Atmospheric turbulence

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SPIE Journal Paper | 5 October 2018 Open Access

Open Access

Computer simulations of optical turbulence in the weak- and strong-scattering regime: angle-of-arrival fluctuations obtained from ray optics and wave optics

David Voelz, Erandi Wijerathna, Andreas Muschinski, Xifeng Xiao

OE, Vol. 57, Issue 10, 104102, (October 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.10.104102

KEYWORDS: Geometrical optics, Scattering, Turbulence, Computer simulations, Diffraction, Optical turbulence, Ray tracing, Wave propagation, Optical simulations, Atmospheric propagation

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Proceedings Article | 6 September 2017 Presentation + Paper

Presentation + Paper

Angle-of-arrival variance of waves and rays in strong atmospheric scattering: split-step simulation results

David Voelz, Erandi Wijerathna, Xifeng Xiao, Andreas Muschinski

Proceedings Volume 10410, 104100Y (2017) https://doi.org/10.1117/12.2275992

KEYWORDS: Scattering, Geometrical optics, Turbulence, Diffraction, Atmospheric optics, Atmospheric propagation, Wave propagation, Computer simulations, Refraction, Atmospheric turbulence

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Proceedings Article | 1 May 2017 Paper

Paper

Physics-based modeling tool development for spectral-sensing measurements under atmospheric attenuation

Xifeng Xiao, David Voelz, Joseph Montoya, Miguel Salinas

Proceedings Volume 10202, 102020M (2017) https://doi.org/10.1117/12.2267741

KEYWORDS: Sensors, Atmospheric modeling, Signal detection, Physics, Atmospheric physics, Human-machine interfaces, Imaging systems, Signal attenuation, Remote sensing, Radio optics, Atmospheric sensing, Visualization, Analytical research, Lanthanum, Black bodies, Atmospheric particles

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Proceedings Article | 15 March 2016 Paper

Paper

Experimental study of a DMD based compressive line sensing imaging system in the turbulence environment

Bing Ouyang, Weilin Hou, Cuiling Gong, Frank Caimi, Fraser Dalgleish, Anni Vuorenkoski, Xifeng Xiao, David Voelz

Proceedings Volume 9761, 97610K (2016) https://doi.org/10.1117/12.2212426

KEYWORDS: Imaging systems, Turbulence, Digital micromirror devices, Sensing systems, Compressed sensing, Optical turbulence, Environmental sensing, LIDAR, Electro optical imaging, Compressive imaging, Prototyping, Receivers, Sensors, Scattering

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SPIE Journal Paper | 10 December 2015 Open Access

Open Access

Generating partially coherent Schell-model sources using a modified phase screen approach

Milo Hyde, Santasri Basu, David Voelz, Xifeng Xiao

OE, Vol. 54, Issue 12, 120501, (December 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.12.120501

KEYWORDS: Spatial light modulators, Diffraction gratings, Speckle pattern, Diffraction, Light sources, Speckle, Global system for mobile communications, Optical engineering, Cameras, Coherence (optics)

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Proceedings Article | 1 September 2015 Paper

Paper

Polarization-based complex index of refraction estimation with diffuse scattering consideration

Hanyu Zhan, David Voelz, Xifeng Xiao, Sang-Yeon Cho

Proceedings Volume 9613, 96130Y (2015) https://doi.org/10.1117/12.2188281

KEYWORDS: Scattering, Refractive index, Polarization, Copper, Light scattering, Platinum, Reflection, Polymethylmethacrylate, Dielectrics, Metals

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Proceedings Article | 3 October 2014 Paper

Paper

Laboratory implementation of partially coherent beams with super-Gaussian distribution

Xifeng Xiao, Olga Korotkova, David Voelz

Proceedings Volume 9224, 92240N (2014) https://doi.org/10.1117/12.2063148

KEYWORDS: Spatial light modulators, Seaborgium, Free space optical communications, Atmospheric propagation, Diffraction, Polarizers, Beam splitters, CCD cameras, Computer engineering, Lanthanum

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Proceedings Article | 25 September 2013 Paper

Paper

Wave optics simulation for beams with spatially varying coherence properties

Xifeng Xiao, David Voelz

Proceedings Volume 8874, 887405 (2013) https://doi.org/10.1117/12.2026882

KEYWORDS: Scalable video coding, Optical simulations, Global system for mobile communications, Beam propagation method, Wave propagation, Computer simulations, Transmittance, Gaussian beams, Atmospheric propagation, Coherence (optics)

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SPIE Journal Paper | 21 June 2013 Open Access

Open Access

Infrared acousto-optic tunable filter point spectrometer for detection of organics on mineral surfaces

Rula Tawalbeh, David Voelz, David Glenar, Xifeng Xiao, Nancy Chanover, Robert Hull, David Kuehn

OE, Vol. 52, Issue 06, 063604, (June 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.6.063604

KEYWORDS: Sensors, Picosecond phenomena, Spectroscopy, Reflectivity, Mirrors, Signal detection, Tunable filters, Infrared spectroscopy, Infrared radiation, Acousto-optics

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SPIE Journal Paper | 3 April 2012 Open Access

Open Access

Errata: Beam wander analysis for focused partially coherent beams propagating in turbulence

Xifeng Xiao, David Voelz

OE, Vol. 51, Issue 03, 039802, (April 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.3.039802

KEYWORDS: Beam analyzers, Beam propagation method, Turbulence, Computer engineering, Lanthanum, Optical engineering

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SPIE Journal Paper | 1 March 2012 Open Access

Open Access

Beam wander analysis for focused partially coherent beams propagating in turbulence

Xifeng Xiao, David Voelz

OE, Vol. 51, Issue 02, 026001, (March 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.2.026001

KEYWORDS: Turbulence, Beam propagation method, Scintillation, Beam analyzers, Optical simulations, Atmospheric propagation, Wave propagation, Computer simulations, Optical engineering, Atmospheric turbulence

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Proceedings Article | 27 February 2010 Paper

Paper

Wave optics simulation of Gaussian Schell-model vortex beam propagation in turbulence: intensity and scintillation analysis

Xifeng Xiao, David Voelz

Proceedings Volume 7588, 75880P (2010) https://doi.org/10.1117/12.848515

KEYWORDS: Turbulence, Scintillation, Receivers, Optical simulations, Atmospheric propagation, Wave propagation, Beam propagation method, Solids, Global system for mobile communications, Transmitters

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Proceedings Article | 4 September 2009 Paper

Paper

Estimation of laser system pointing parameters using a near-Gaussian irradiance profile

Sreedhar Aeddy, Deva Borah, David Voelz, Xifeng Xiao

Proceedings Volume 7445, 74450W (2009) https://doi.org/10.1117/12.830945

KEYWORDS: Laser systems engineering, Signal to noise ratio, Statistical analysis, Error analysis, Atmospheric turbulence, Satellites, Optical alignment, Transmitters, Monte Carlo methods, Laser optics

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Proceedings Article | 31 August 2009 Paper

Paper

Near-optimal focus for Gaussian beam propagation through turbulence: analysis and wave optics simulation results

Xifeng Xiao, David Voelz

Proceedings Volume 7382, 738247 (2009) https://doi.org/10.1117/12.836953

KEYWORDS: Turbulence, Optical simulations, Scintillation, Atmospheric propagation, Wave propagation, Beam propagation method, Gaussian beams, Computer simulations, Solids, Laser beam propagation

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Proceedings Article | 21 August 2009 Paper

Paper

Wave optics simulation of partially coherent and partially polarized beam propagation in turbulence

Xifeng Xiao, David Voelz

Proceedings Volume 7464, 74640T (2009) https://doi.org/10.1117/12.829336

KEYWORDS: Global system for mobile communications, Scintillation, Receivers, Optical simulations, Turbulence, Polarization, Wave propagation, Beam propagation method, Atmospheric optics, Spatial coherence

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SPIE Journal Paper | 1 March 2009

Metric for optimizing spatially partially coherent beams for propagation through turbulence

David Voelz, Xifeng Xiao

OE, Vol. 48, Issue 03, 036001, (March 2009) https://doi.org/10.1117/12.10.1117/1.3090435

KEYWORDS: Turbulence, Scintillation, Wave propagation, Free space optics, Beam propagation method, Global system for mobile communications, Optical engineering, Optical simulations, Signal to noise ratio, Solids

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Proceedings Article | 24 February 2009 Paper

Paper

Wave optics simulation study of multiple Gaussian beam transmitters for free space optical transmission through turbulence

Xifeng Xiao, David Voelz, Jagan Aluguri

Proceedings Volume 7200, 72000K (2009) https://doi.org/10.1117/12.808338

KEYWORDS: Scintillation, Receivers, Turbulence, Optical simulations, Fourier transforms, Gaussian beams, Transmitters, Beam propagation method, Free space optics, Atmospheric propagation

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Proceedings Article | 24 February 2009 Paper

Paper

A brief review of spatially partially coherent beams for FSO communications

David Voelz, Xifeng Xiao

Proceedings Volume 7200, 72000C (2009) https://doi.org/10.1117/12.812046

KEYWORDS: Scintillation, Free space optics, Turbulence, Atmospheric propagation, Optical simulations, Receivers, Radio propagation, Beam propagation method, Atmospheric modeling, Free space

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Proceedings Article | 24 February 2009 Paper

Paper

Analysis and simulation of a fiber bundle method for creating a partially spatially coherent beam

Xifeng Xiao, Jagan Aluguri, David Voelz

Proceedings Volume 7200, 72000D (2009) https://doi.org/10.1117/12.812054

KEYWORDS: Optical simulations, Computer simulations, Atmospheric propagation, Receivers, Temporal coherence, Wave propagation, Geometrical optics, Beam propagation method, Free space optics, Transmittance

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SPIE Journal Paper | 1 May 2008

Liquid crystal variable retarder modeling of incident angle response with experimental verification

Xifeng Xiao, David Voelz

OE, Vol. 47, Issue 05, 054002, (May 2008) https://doi.org/10.1117/12.10.1117/1.2923742

KEYWORDS: Liquid crystals, Wave plates, Polarization, Systems modeling, Data modeling, Molecules, Optical engineering, Glasses, Refraction, Power meters

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Proceedings Article | 25 September 2007 Paper

Paper

Toward optimizing partial spatially coherent beams for free space laser communications

Xifeng Xiao, David Voelz

Proceedings Volume 6709, 67090P (2007) https://doi.org/10.1117/12.735634

KEYWORDS: Probability theory, Turbulence, Free space optics, Scintillation, Optical simulations, Coherence (optics), Receivers, Free space optical communications, Atmospheric propagation, Wave propagation

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Proceedings Article | 1 September 2006 Paper

Paper

Wave optics simulation of pseudo-partially coherent beam propagation through turbulence: application to laser communications

Xifeng Xiao, David Voelz

Proceedings Volume 6304, 63040L (2006) https://doi.org/10.1117/12.681273

KEYWORDS: Receivers, Scintillation, Atmospheric propagation, Turbulence, Wave propagation, Optical simulations, Global system for mobile communications, Beam propagation method, Transmitters, Free space optics

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Proceedings Article | 13 September 2005 Paper

Paper

Wave optics simulation of partially coherent beams

Xifeng Xiao, David Voelz

Proceedings Volume 5892, 58920Q (2005) https://doi.org/10.1117/12.618856

KEYWORDS: Atmospheric propagation, Optical simulations, Scintillation, Beam propagation method, Turbulence, Atmospheric turbulence, Global system for mobile communications, Wave propagation, Free space optics, Computer simulations

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Proceedings Article | 18 August 2005 Paper

Paper

Jones matrix model with field angle effects for a liquid crystal variable retarder

Xifeng Xiao, David Voelz

Proceedings Volume 5888, 58881J (2005) https://doi.org/10.1117/12.619545

KEYWORDS: Liquid crystals, Mathematical modeling, Polarimetry, Wave plates, Polarization, Polarizers, Power meters, Data modeling, Imaging systems, Refraction

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Proceedings Article | 12 December 2003 Paper

Paper

Field-of-view characteristics of a liquid crystal variable retarder

Xifeng Xiao, David Voelz, Hiroshi Sugiura

Proceedings Volume 5158, (2003) https://doi.org/10.1117/12.506851

KEYWORDS: Liquid crystals, Mathematical modeling, Molecules, Wave plates, Polarization, Polarizers, Power meters, Systems modeling, Refraction, Chemical elements

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Proceedings Article | 29 November 2000 Paper

Paper

Capture barrier of Sn-related DX centers in AlGaAs epilayers

Xifeng Xiao, Junyong Kang, Huahan Zhan, Qisheng Huang, Zhanguo Wang

Proceedings Volume 4086, (2000) https://doi.org/10.1117/12.408452

KEYWORDS: Electrons, Capacitance, Temperature metrology, Spectroscopy, Semiconductors, Physics, Visible radiation, Aluminum, Semiconductor materials, Thin films

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Showing 5 of 28 publications

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