Mr. Keith Kang Profile

Keith Kang

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Publications (9)

Proceedings Article | 29 June 2000 Paper

Detection and processing of hyperspectral imaging data with quantum-well devices

Thomas McElwain, Keith Kang, Jeffry Powell, Richard Stack, John Trezza

Proceedings Volume 4041, (2000) https://doi.org/10.1117/12.390477

KEYWORDS: Optical correlators, Spatial light modulators, Detection and tracking algorithms, Binary data, Optical filters, Sensors, Phase only filters, Modulators, Target detection, Hyperspectral imaging

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Proceedings Article | 31 March 2000 Paper

Design and evaluation of a multiple quantum well SLM-based optical correlator

James Kirsch, Brian Jones, Keith Kang

Proceedings Volume 4043, (2000) https://doi.org/10.1117/12.381620

KEYWORDS: Optical correlators, Modulators, Spatial light modulators, Electronics, Cameras, Quantum wells, Binary data, Sensors, Missiles, Analog electronics

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Proceedings Article | 9 March 1999 Paper

Optical image correlation using high-speed multiple quantum well spatial light modulators

Keith Kang, Jeffry Powell, Richard Stack, Charles Garvin, John Trezza, James Kirsch, Brian Jones

Proceedings Volume 3715, (1999) https://doi.org/10.1117/12.341289

KEYWORDS: Spatial light modulators, Optical correlators, Binary data, Image filtering, Filtering (signal processing), Quantum wells, Phase only filters, Modulators, Analog electronics, Target recognition

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Proceedings Article | 9 October 1998 Paper

Overview of high-speed multiple quantum well optical modulator devices and their applications at Lockheed Martin Sanders

Charles Garvin, John Trezza, John Ahearn, Keith Kang, Jeffry Powell, Richard Stack

Proceedings Volume 3466, (1998) https://doi.org/10.1117/12.326777

KEYWORDS: Spatial light modulators, Modulators, Modulation, Quantum wells, Binary data, Gallium arsenide, Reflectivity, Diffraction, Clocks, Absorption

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Proceedings Article | 22 May 1998 Paper

Creation and application of very large format high-fill-factor GaAs-on-CMOS binary and gray-scale modulator and emitter arrays

John Trezza, Jeffry Powell, Charles Garvin, Keith Kang, Richard Stack

Proceedings Volume 3490, (1998) https://doi.org/10.1117/12.308890

KEYWORDS: Binary data, Modulators, Silicon, Modulation, Clocks, Switching, Spatial light modulators, Gallium arsenide, Light emitting diodes, Human-machine interfaces

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Proceedings Article | 20 April 1998 Paper

High-speed electrically controlled GaAs quantum well spatial light modulators: device creation and applications

John Trezza, Keith Kang, Jeffry Powell, Charles Garvin, Richard Stack

Proceedings Volume 3292, (1998) https://doi.org/10.1117/12.305494

KEYWORDS: Modulation, Quantum wells, Modulators, Reflectivity, Gallium arsenide, Silicon, Absorption, Image filtering, Optical storage, Light emitting diodes

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Proceedings Article | 29 July 1997 Paper

GaAs/optical Si CMOS hybrid-based vertical cavity modulator technology for space-based applications

John Alfred Trezza, Jeffry Powell, Keith Kang

Proceedings Volume 10288, 102880E (1997) https://doi.org/10.1117/12.278753

KEYWORDS: Silicon, Modulators, CMOS technology, Electronic circuits, Gallium arsenide, Fabry–Perot interferometers, Amplitude modulation, Optical switching, Phase modulation, Modulation

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Proceedings Article | 18 August 1992 Paper

Nonlinear absorption and nonlinear refraction in InSb and Hg1-xCdxTe

Keith Kang, Shekhar Guha, Wen Chen

Proceedings Volume 1692, (1992) https://doi.org/10.1117/12.138061

KEYWORDS: Absorption, Optical switching, Refraction, Nonlinear optics, Pulsed laser operation, Carbon dioxide lasers, Switching, Sensors, Semiconducting wafers, Nitrogen

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Proceedings Article | 1 October 1990 Paper

Nonlinear absorption and nonlinear refraction in HgCdTe

Shekhar Guha, Stephen Buchner, Keith Kang, C. Freter, Wen Chen

Proceedings Volume 1307, (1990) https://doi.org/10.1117/12.21677

KEYWORDS: Sensors, Absorption, Electro optical sensors, Refraction, Nonlinear optics, Electro optics, Switches, Optical coatings, Mercury cadmium telluride, Semiconducting wafers

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The large third order susceptibility of Hg1_CdTe makes it a very promising material for many applications, including optical switching. There have been numerous studies' 4) ofthe optical nonlinearities of Hg1_CdTe and it is well known that for values ofx near 0.2 and for 10.6 ,tm radiation, both nonlinear absorption arising from two photon absorption and nonlinear refraction arising from the charge carriers generated by two photon absorption play a role in determining the overall nonlinearity. To optimize the performance of a device that utilizes the nonlinearity of Hg1 _CdTe it is sometimes necessary to separate the relative contributions of these two mechanisms. The recently developed "z-scan" technique provides a convenient way of achieving this5. We present here a study of the nonlinearity of Hg1_Cd7Te using the z-scan method. In the next section, we first describe a theory of z-scan results expected for the external self focusing case. Although there are many theoretical studies67 of the external seLf focusing case, it is hard to find them presented in a general form from which many cases of interest can be easily evaluated. Moreover, the refractive nonlinearity is usually assumed to be of the Kerr-type, which is not in general true. Also, the effects of nonlinear refraction and absorption are usually not considered together. We present our results here in terms of dimensionless parameters, and inclilde the near field and far-field effects. We also take into account the time dependences of the incident laser beam and the nonlinearity of the medium. The results are presented in forms of integrals which can be evaluated for arbitrary nonlinear phase changes. Next, we apply the theory to the case of Hg1 _Cd1Te in which the dominant nonlinear phase change arises from refraction due to generated free carriers and the dominant nonlinear absorption arises from two-photon absorption. The generation of the charge carriers via two-photon absorption and their decay by means of Auger recombination are taken into account. The temporal profile of the laser beam used in the experiment described in section 3 was close to Gaussian-this was taken into account in the theory.

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