28 April 1995 High-power coherent phased array of monolithic flared amplifier-master oscillator power amplifiers (MFA-MOPAs)
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Abstract
A monolithically integrated array of InGaAs/AlGaAs flared amplifiers driven by a single DBR laser through a power splitter network and individually addressed phase modulators is described. Phase adjustment of > 2(pi) per element by free-carrier effects is verified by monitoring the interference pattern of 4 emitters, and typically requires < 15 mA of current to obtain a 2(pi) phase shift. Phase matching is achieved among all four diffraction-limited emitters at a pulsed output power of > 5 W, and, combined with the proper external lensing, could therefore result in an ultra-narrow, single-lobed far-field pattern whose width is determined by the extended aperture of the array. This architecture is capable of providing single-mode, diffraction-limited performance from each emitter and is scalable to unprecedented power levels. Over 20 W of pulsed, spectrally coherent emission is generated at 955 nm from a 4-element array, and 39 W is obtained from an 8-element array.
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Jules S. Osinski, David G. Mehuys, David F. Welch, Kenneth M. Dzurko, Robert J. Lang, "High-power coherent phased array of monolithic flared amplifier-master oscillator power amplifiers (MFA-MOPAs)", Proc. SPIE 2382, Laser Diodes and Applications, (28 April 1995); doi: 10.1117/12.208462; https://doi.org/10.1117/12.208462
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