Mr. Alexander Sohn Profile

Alexander Sohn

Precision Engineer at Meta

SPIE Involvement:

Author

Area of Expertise:

Diamond Turning , Freeform Optics , Metrology , Optics Fabrication

Alex Sohn has preformed research in diamond turning and metrology for over twenty years. He has developed numerous tools for the fabrication and metrology of freefrom optics. His contributions span the spectrum from opthalmics, defense and astronomy to lasers and consumer electronics.

Proceedings Article | 20 May 2022 Presentation + Paper

High resolution, non-contact surface metrology for freeform optics in digital immersive displays

Alex Sohn, Nelson Cardenas, Neil Naples, Xavier Colonna de Lega, Jan Liesener, Thomas Dresel, Peter de Groot

Proceedings Volume 12137, 121370J (2022) https://doi.org/10.1117/12.2624964

KEYWORDS: Metrology, Interferometry, Sensors, Freeform optics, Calibration, Optical spheres, Optical alignment, Surface finishing, Confocal microscopy, Colorimetry, Stitching interferometry

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Proceedings Article | 13 May 2019 Presentation

Compact snapshot freefrom null testing with adaptive optics (Conference Presentation)

Xiaobo Tian, Heejoo Choi, Alexander Sohn, Yu Zhang, Oliver Joshua Spires, Dae Wook Kim, Rongguang Liang

Proceedings Volume 10991, 109910Q (2019) https://doi.org/10.1117/12.2518789

KEYWORDS: Deformable mirrors, Optical testing, Adaptive optics, Algorithm development, Wavefronts, Interferometry, Stochastic processes, Phase measurement, Deflectometry

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Proceedings Article | 13 May 2019 Presentation

Dual-mode snapshot interferometric system for on-machine metrology (Conference Presentation)

Xiaobo Tian, Alexander Sohn, Yu Zhang, Oliver Spires, Rongguang Liang

Proceedings Volume 10991, 109910P (2019) https://doi.org/10.1117/12.2518689

KEYWORDS: Metrology, Interferometry, Surface roughness, Optical fabrication, Interferometers, Microscopy, Polarization, Cameras, Diamond turning

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SPIE Journal Paper | 30 April 2019

Dual-mode snapshot interferometric system for on-machine metrology

Xiaobo Tian, Yu Zhang, Alexander Sohn, Oliver Spires, Rongguang Liang

OE, Vol. 58, Issue 04, 044104, (April 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.4.044104

KEYWORDS: Metrology, Interferometry, Calibration, Cameras, Surface roughness, Interferometers, Diamond, Copper, Polymethylmethacrylate, Microscopes

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Proceedings Article | 21 May 2018 Paper

Viewing optics for immersive near-eye displays: pupil swim/size and weight/stray light

Ying Geng, Jacques Gollier, Brian Wheelwright, Fenglin Peng, Yusufu Sulai, Brant Lewis, Ning Chan, Wai Sze Lam, Alexander Fix, Douglas Lanman, Yijing Fu, Alexander Sohn, Brett Bryars, Nelson Cardenas, Youngshik Yoon, Scott McEldowney

Proceedings Volume 10676, 1067606 (2018) https://doi.org/10.1117/12.2307671

KEYWORDS: Distortion, Eye, Fresnel lenses, Stray light, Wavefront sensors, Modulation transfer functions, Cameras, Lenses, Diffraction, Virtual reality, Polarization

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SPIE Journal Paper | 2 June 2016

Design and validation of the mounting structure for BETTII balloon-based telescope with thin-walled optics

Stephen Furst, Thomas Dow, Kenneth Garrard, Alexander Sohn, Dale Fixsen, Stephen Rinehart, Eric Mentzell, Todd Veach, Maxime Rizzo, Arnab Dhabal

JATIS, Vol. 2, Issue 02, 024001, (June 2016) https://doi.org/10.1117/12.10.1117/1.JATIS.2.2.024001

KEYWORDS: Mirrors, Space telescopes, Telescopes, Optical mounts, Optical instrument design, Infrared telescopes, Kinematics, Astronomical telescopes, Aluminum, Astronomical imaging

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Proceedings Article | 24 August 2005 Paper

Design tools for freeform optics

Kenneth Garrard, Thomas Bruegge, Jeff Hoffman, Thomas Dow, Alex Sohn

Proceedings Volume 5874, 58740A (2005) https://doi.org/10.1117/12.617680

KEYWORDS: Mirrors, Optics manufacturing, Optical design, Freeform optics, Code v, Wavefronts, Fourier transforms, Manufacturing, Servomechanisms, Aspheric lenses

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Proceedings Article | 24 September 2004 Paper

Highlights of the ASPE 2004 Winter Topical Meeting on Free-Form Optics: Design, Fabrication, Metrology, Assembly

Raymond Ohl, Thomas Dow, Alex Sohn, Kenneth Garrard

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.551469

KEYWORDS: Freeform optics, Optical design, Metrology, Mirrors, Astronomical imaging, Space telescopes, Aspheric optics, X-ray optics, James Webb Space Telescope, Infrared spectroscopy

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Proceedings Article | 7 March 2003 Paper

Design and fabrication of diamond-machined aspheric mirrors for ground-based near-IR astronomy

Raymond Ohl, Werner Preuss, Alex Sohn, Shelly Conkey, Ken Garrard, John Hagopian, Joseph Howard, Jason Hylan, Sandra Irish, John Mentzell, Mechthild Schroeder, Leroy Sparr, Robert Winsor, Said Wahid Zewari, Matthew Greenhouse, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458967

KEYWORDS: Mirrors, Aluminum, Optical alignment, Spindles, Off axis mirrors, Tolerancing, Diamond, Space telescopes, Optical fabrication, Single point diamond turning

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