A marked reduction of cw threshold current, to as low as 10 mA at 25°C, was achieved in 1.3 µm InGaAsP InP buried heterostructure lasers with optimized stripe widths of 1.5–2.5 µm, resulting in the feasibility of high temperature operation up to 95°C. For the first time, high temperature cw agings at 50 and 70°C were carried out for lasers in this wavelength region, with successful results.
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Mizuishi et al. (1980) studied this question.
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