Dr. Fassil Ghebremichael Profile

Dr. Fassil Ghebremichael

at Coherent Inc

SPIE Involvement:

Author

Proceedings Article | 22 August 2014 Paper

HALOS: fast, autonomous, holographic adaptive optics

Geoff Andersen, Paul Gelsinger-Austin, Ravi Gaddipati, Phani Gaddipati, Fassil Ghebremichael

Proceedings Volume 9148, 91485S (2014) https://doi.org/10.1117/12.2054444

KEYWORDS: Actuators, Holograms, Holography, Adaptive optics, Photodiodes, Wavefronts, Sensors, Deformable mirrors, Wavefront sensors, Laser systems engineering

Read Abstract +

Proceedings Article | 3 June 2014 Paper

HALOS: fast compact, autonomous adaptive optics for UAVs

G. Andersen, P. Gelsinger-Austin, F. Ghebremichael, P. Gaddipati, Ravi Gaddipati

Proceedings Volume 9084, 90840Z (2014) https://doi.org/10.1117/12.2050565

KEYWORDS: Actuators, Holograms, Adaptive optics, Wavefronts, Holography, Wavefront sensors, Sensors, Multiplexing, Computing systems, Unmanned aerial vehicles

Read Abstract +

Proceedings Article | 3 June 2013 Paper

Fast computer-free holographic adaptive optics

Geoff Andersen, Fassil Ghebremichael, Ravi Gaddipati, Phani Gaddipati, Paul Gelsinger-Austin, Ken MacDonald

Proceedings Volume 8744, 87440Y (2013) https://doi.org/10.1117/12.2015900

KEYWORDS: Actuators, Wavefronts, Adaptive optics, Holograms, Holography, Multiplexing, Computing systems, Wavefront sensors, Sensors, Deformable mirrors

Read Abstract +

Proceedings Article | 13 September 2012 Paper

Fast computer-free holographic adaptive optics

Geoff Andersen, Fassil Ghebremichael, Ravi Gaddipati, Phani Gaddipati

Proceedings Volume 8447, 84472L (2012) https://doi.org/10.1117/12.924247

KEYWORDS: Actuators, Holograms, Wavefronts, Holography, Adaptive optics, Deformable mirrors, Multiplexing, Wavefront sensors, Control systems, Sensors

Read Abstract +

Proceedings Article | 16 May 2012 Paper

Holographic adaptive laser optics system (HALOS)

Geoff Andersen, Fassil Ghebremichael, Jeff Baker, Ravi Gaddipati, Phani Gaddipati

Proceedings Volume 8380, 83800D (2012) https://doi.org/10.1117/12.918445

KEYWORDS: Actuators, Holograms, Holography, Wavefronts, Wavefront sensors, Deformable mirrors, Adaptive optics, Laser systems engineering, Laser optics, Multiplexing

Read Abstract +

SPIE Journal Paper | 1 August 2009

Holographic wavefront sensor

Geoff Andersen, Luis Dussan, Fassil Ghebremichael, Kenny Chen

OE, Vol. 48, Issue 08, 085801, (August 2009) https://doi.org/10.1117/12.10.1117/1.3204232

KEYWORDS: Sensors, Holograms, Wavefront sensors, Holography, Multiplexing, Adaptive optics, Computer generated holography, Monochromatic aberrations, Prototyping, Wavefronts

Read Abstract +

Proceedings Article | 20 February 2007 Paper

Holographic wavefront sensor: fast sensing, no computing

Geoff Andersen, Fassil Ghebremichael, Ken Gurley

Proceedings Volume 6488, 64880I (2007) https://doi.org/10.1117/12.701231

KEYWORDS: Holograms, Sensors, Wavefront sensors, Holography, Wavefronts, Multiplexing, Computer generated holography, Optical design, Zernike polynomials, Spatial filters

Read Abstract +

Proceedings Article | 23 February 2006 Paper

Self-referenced locking of optical coherence by single-detector electronic-frequency tagging

T. Shay, Vincent Benham, Justin Spring, Benjamin Ward, F. Ghebremichael, Mark Culpepper, Anthony Sanchez, J. Baker, D. Pilkington, Richard Berdine

Proceedings Volume 6102, 61020V (2006) https://doi.org/10.1117/12.646634

KEYWORDS: Photodetectors, Mode locking, Modulation, Phase shift keying, Phase measurement, Optical components, Phased array optics, Optical arrays, Modulators, Fiber lasers

Read Abstract +

Proceedings Article | 10 November 2003 Paper

Modeling, synthesis, and characterization of third-order nonlinear optical salts

Rico Del Sesto, Douglas Dudis, Fassil Ghebremichael, Norman Heimer, Tammy Low, John Wilkes, A. Yeates

Proceedings Volume 5212, (2003) https://doi.org/10.1117/12.504807

KEYWORDS: Nonlinear optics, Absorption, Liquids, Optical limiting, Sensors, Metals, Refraction, Cobalt, Molecules, Chlorine

Read Abstract +

Proceedings Article | 28 July 2000 Paper

Modeling and prototyping of polymer fiber-based chemical and biological agent sensors

Michael Hawks, Iyad Dajani, Carl Kutsche, Fassil Ghebremichael

Proceedings Volume 4036, (2000) https://doi.org/10.1117/12.394056

KEYWORDS: Luminescence, Sensors, Waveguides, Polymers, Prototyping, Beam propagation method, Biological weapons, Wave propagation, Molecules, Rhodamine

Read Abstract +

Proceedings Article | 16 December 1993 Paper

Molecular mobility studies of dye-doped polymers below and above room temperature using second-harmonic generation

Fassil Ghebremichael, Mark Kuzyk, Carl Dirk

Proceedings Volume 2025, (1993) https://doi.org/10.1117/12.165298

KEYWORDS: Polymers, Temperature metrology, Glasses, Molecules, Polymethylmethacrylate, Chromophores, Interfaces, Second-harmonic generation, Data modeling, Harmonic generation

Read Abstract +

Showing 5 of 11 publications

Conference Committee Involvement (1)

Third-Order Nonlinear Optical Materials III

3 August 2000 | San Diego, CA, United States

Keywords/Phrases

Search In:

Publication Years