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The monolithic integration of an index-guided single lateral mode optical preamplifier with a power tapered semiconductor laser amplifier is reported. With a coupled input power of only 6 mW, 4.5W of output power is obtained at 810nm. The far-field pattern is dominated by a diffraction-limited single lobe. An internal small signal gain of 35dB is demonstrated.
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Yeh et al. (1993) studied this question.
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