A large spontaneous emission factor of 0.1 was evaluated in a 1.56 μm-GaInAsP microdisk injection laser operating under continuous-wave condition with a threshold current of 50 μA. Some clear evidence of the large spontaneous emission factor, i.e., superlinear light-current characteristics and nonclamped carrier-current characteristics, were observed. It was confirmed that the matching of the lasing wavelength to the spontaneous emission allowed larger spontaneous emission factor.
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Fujita et al. (2001) studied this question.
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