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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jules S. Osinski, Jules S. Osinski, David G. Mehuys, David G. Mehuys, David F. Welch, David F. Welch, Kenneth M. Dzurko, Kenneth M. Dzurko, Robert J. Lang, 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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