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Observation of stimulated emission in the near ultraviolet from a molecular beam epitaxy grown GaN film on sapphire in a vertical-cavity, single pass configuration (1994)

Yung, K. ; Yee, J. ; Koo, J. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 64 (1994), S. 1135-1137

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We report the first observation of stimulated emission from a GaN film grown by ion-assisted molecular beam epitaxy. The observed near-UV optical emission power was a nonlinear function of the pump power density. The characteristics of the observed stimulated emission are similar to those observed recently from films grown with low-pressure metalorganic chemical vapor deposition techniques.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.110830

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Logical moiré and its application (1991)

Asundi, A. ; Yung, K. H.

Springer

Experimental mechanics 31 (1991), S. 236-242

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ISSN: 1741-2765

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Moiré fringes are generated using logical operations on one-bit binary gratings. A traditional moiré effect is observed using the AND operator while an enhanced moiré is observed using the XOR operation. Since the reference grating in this type of moiré is computer generated, fringe shifting to increase sensitivity can be easily accomplished. An alternative scheme, called the average step method, resulting from the logical operations with values averaged over the pitch of the reference grating, can also be used for fractional fringe-order determination. These principles with some applications are demonstrated in this paper.