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The power-dependent part of the linewidth of GaAs/AlGaAs GRINSCH-SQW flared waveguide lasers has been determined from FM noise measurements. For the linewidthpower product a low value of 4 MHz mW has been found, which can be related to the small spontaneous emission coefficient βSP≃(3.7 ± 1)×10−6 and a linewidth enhancement factor α≃1.2 ± 0.5.
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Hartl et al. (1988) studied this question.
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