Extremely low-threshold, single-longitudinal-mode operation is reported for 1.5μm band Gain As multiple quantum well, distributed feedback laser diodes. A 5.5 mA minimum threshold current as well as 40 mW maximum light output power and 0–33 W/A maximum quantum efficiency have been attained under CW condition at room temperature.
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Kitamura et al. (1988) studied this question.
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