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We report a 7-stage narrow-ridge interband-cascade laser emitting at λ ≈ 3.5 µm that produces up to 592 mW of cw power, with a wallplug efficiency of 10.1% and M2 = 3.7 at T = 25 °C.
We demonstrate butt-coupling of a 3.4 μm interband cascade laser into a 3.7 μm thick by 7 μm wide GeSbS chalcogenide ridge waveguide and measure a total insertion loss of −28 dB.
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