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The first low threshold continuous operation of InGaAs strained layer quantum well lasers at approximately 2.0 mu m is reported. The threshold current density of 5 mu m wide and 1.5 mm long ridge waveguide lasers was less than 380 A/cm/sup 2/. The external differential quantum efficiency of 1 mm long lasers was as high as 15% and laser operation was observed at temperatures as high as 50 degrees C...
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