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Single far-field lobe and single-mode operation of a 20-element GaAlAs gain-guided coupled-stripe array with 315 mW of output was obtained by injection locking with 3.9 mW of incident power. The 0.31° lobe width was near the diffraction limit. An external small-signal gain of 19 dB was obtained.
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Goldberg et al. (1986) studied this question.
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