With this device, the researchers observed laser emission in the alloy under continuous-wave (cw) excitation. The laser effect is reached both under continuous wave and pulsed excitations, at temperatures up to 70K and 100K, respectively. The fabricated lasers operated at a wavelength of 2.5μm with a thresholds of 0.8 kW cm−2 for nanosecond pulsed optical excitation and 1.1 kW cm−2 under continuous-wave optical excitation. These thresholds are two orders of magnitude lower than reported in the literature, the researchers highlight, opening a new path toward the integration of group IV laser on a Si-photonic platform.
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