Prof. Ayman Mokhtar Profile

Prof. Ayman Mokhtar

at Military Technical College

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Author

Publications (8)

Proceedings Article | 9 October 2021 Presentation + Paper

Field performance evaluation of aged thermal imaging systems

Mohamed Ellithey, Hany El-sheikh, Alaaeldin Mahmoud, Ayman M. Mokhtar

Proceedings Volume 11906, 119060O (2021) https://doi.org/10.1117/12.2604304

KEYWORDS: Minimum resolvable temperature difference, Transmittance, Thermography, Atmospheric modeling, Target recognition, Target detection, Spatial frequencies, Optical simulations, Thermal imaging cameras

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Proceedings Article | 7 March 2019 Paper

Modeling and design of passive Q-switched Nd:YAG for laser induced breakdown spectroscopy (LIBS) applications

Tamer Kashif, Amro Harfoosh, Ayman Mokhtar

Proceedings Volume 10896, 1089622 (2019) https://doi.org/10.1117/12.2521189

KEYWORDS: Laser induced breakdown spectroscopy, Q switched lasers, Nd:YAG lasers, Laser systems engineering, Pulsed laser operation, Lamps, Q switching, Plasma, Power supplies, Laser sources

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Proceedings Article | 27 February 2019 Paper

Polymer fiber analysis and performance evaluation for short distance applications and medical sensing applications

Ayman Mokhtar, Mohamed Hosni

Proceedings Volume 10872, 108721A (2019) https://doi.org/10.1117/12.2523063

KEYWORDS: Polymers, Signal attenuation, Polymer optical fibers, Phase only filters, Polymethylmethacrylate, Dispersion, Chemical species, Fiber optics sensors, Absorption, Cladding

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Proceedings Article | 15 February 2018 Paper

Enhancement of thermal blooming effect on free space propagation of high power CW laser beam

Tamer Kashef, Ayman Mokhtar, Samy Ghoniemy

Proceedings Volume 10511, 105112F (2018) https://doi.org/10.1117/12.2292313

KEYWORDS: Thermal blooming, Thermal effects, Atmospheric propagation, Atmospheric modeling, Wavefronts, Atmospheric optics, Laser beam propagation, Adaptive optics, High power lasers, Thermal modeling

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Proceedings Article | 15 February 2018 Paper

High power diode pumped solid state (DPSS) laser systems active media robust modeling and analysis

Tamer Kashef, Ayman Mokhtar, Samy Ghoniemy

Proceedings Volume 10511, 105112E (2018) https://doi.org/10.1117/12.2292307

KEYWORDS: Nd:YAG lasers, Optical simulations, Neodymium lasers, Laser crystals, Semiconductor lasers, Laser systems engineering, High power lasers, Diodes, Solid state lasers, Diode pumped solid state lasers

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Proceedings Article | 20 May 2015 Paper

Analysis and modeling of a high power side diode pumped solid state laser system

Tamer Kashef, Ayman Mokhtar, Samy Ghoniemy, Lawrence Shah, Martin Richardson

Proceedings Volume 9466, 94660X (2015) https://doi.org/10.1117/12.2190069

KEYWORDS: Semiconductor lasers, Diodes, Nd:YAG lasers, Diode pumped solid state lasers, Laser systems engineering, Resonators, Optical simulations, Systems modeling, High power lasers, Mirrors

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Proceedings Article | 22 February 2011 Paper

Effects of the source, surface, and sensor couplings and colorimetric of laser speckle pattern on the performance of optical imaging system

M. Darwiesh, Ashraf El-Sherif, Hatem El-Ghandour, Hussein Aly, A. Mokhtar

Proceedings Volume 7920, 792005 (2011) https://doi.org/10.1117/12.874074

KEYWORDS: Diffusers, Light emitting diodes, Speckle, Light sources, RGB color model, Helium neon lasers, Imaging systems, Optical imaging, Semiconductor lasers, Sensors

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Optical imaging systems are widely used in different applications include tracking for portable scanners; input pointing devices for laptop computers, cell phones, and cameras, fingerprint-identification scanners, optical navigation for target tracking, and in optical computer mouse. We presented an experimental work to measure and analyze the laser speckle pattern (LSP) produced from different optical sources (i.e. various color LEDs, 3 mW diode laser, and 10mW He-Ne laser) with different produced operating surfaces (Gabor hologram diffusers), and how they affects the performance of the optical imaging systems; speckle size and signal-to-noise ratio (signal is represented by the patches of the speckles that contain or carry information, and noise is represented by the whole remaining part of the selected image). The theoretical and experimental studies of the colorimetry (color correction is done in the color images captured by the optical imaging system to produce realistic color images which contains most of the information in the image by selecting suitable gray scale which contains most of the informative data in the image, this is done by calculating the accurate Red-Green-Blue (RGB) color components making use of the measured spectrum for light sources, and color matching functions of International Telecommunication Organization (ITU-R709) for CRT phosphorus, Tirinton-SONY Model ) for the used optical sources are investigated and introduced to present the relations between the signal-to-noise ratios with different diffusers for each light source. The source surface coupling has been discussed and concludes that the performance of the optical imaging system for certain source varies from worst to best based on the operating surface. The sensor /surface coupling has been studied and discussed for the case of He-Ne laser and concludes the speckle size is ranged from 4.59 to 4.62 μm, which are slightly different or approximately the same for all produced diffusers (which satisfies the fact that the speckle size is independent on the illuminating surface). But, the calculated value of signal-tonoise ratio takes different values ranged from 0.71 to 0.92 for different diffuser. This means that the surface texture affects the performance of the optical sensor because, all images captured for all diffusers under the same conditions [same source (He-Ne laser), same distances of the experimental set-up, and the same sensor (CCD camera)].

Proceedings Article | 2 October 2006 Paper

Isolator-free DFB laser diode operating in feedback regime V

Ayman Mokhtar, Leonard MacEachern, Samy Mahmoud

Proceedings Volume 6389, 63891F (2006) https://doi.org/10.1117/12.707902

KEYWORDS: Semiconductor lasers, Fiber Bragg gratings, Optical isolators, Reflectivity, Fiber optics, Fiber lasers, Laser optics, Radio optics, Reflectors, Polarization

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Showing 5 of 8 publications

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