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It is verified that the output beam for lasers with a mode-field converter is quite stable against output power up to 30 mW and operating temperature up to 70°C. The threshold current and differential quantum efficiency of an HR-coated device are 14 mA and 45%, respectively. The FWHMs of the FFPs parallel and perpendicular to the junction plane are as small as 10 and 11°, respectively.
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Kasukawa et al. (1995) studied this question.
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