Coherent light generators – Particular active media – Semiconductor
Patent
1988-10-07
1991-01-15
Epps, Georgia
Coherent light generators
Particular active media
Semiconductor
372 18, 372 23, 372 45, 372 48, 372 97, 372102, 372103, H01S 319
Patent
active
049858971
ABSTRACT:
A semiconductor laser array with features providing good beam quality at high powers, first by employing a laterally unguided diffraction region in which light from a set of waveguides is re-imaged in accordance with the Talbot effect and two arrays of waveguides may be used to provide a spatial filtering effect to select a desired array mode. This provides a laser array with increased power per unit solid angle, and with additional advantages of ability to scale the device up to larger arrays, ability to control the electrical excitation of the device for better optimization, and improved modal discrimination. A second aspect of the invention is the use of a resonance condition in an antiguide array, to produce a uniform near-field intensity pattern and improved coupling and device coherence. This resonance structure may be combined with the Talbot-effect structure to suppress the out-of-phase mode, or the out-of-phase mode may be suppressed by other means, such as by introducing interelement radiation losses or absorption losses in the antiguide array.
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D. Botez et al., "High-Power, Diffraction-Limited-Beam Operation from Phase-Locked Arrays of Closely Spaced `Leaky` Waveguides (Antiguides)," Appl. Phys. Lett. 53(6), pp. 464-466, Aug. 8, 1988.
James R. Leger et al., "Real-Time Depth Measurement and Display Using Fresnel Diffraction and White-Light Processing," Appl. Optics, vol. 23, No. 10, pp. 1655-1657, May 15, 1984.
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Botez Dan
Jansen Michael
Mawst Luke J.
Peterson Gary L.
Simmons William W.
Epps Georgia
Goldstein Sol L.
Heal Noel F.
TRW Inc.
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