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We demonstrate a mode-locked interband cascade semiconductor laser operating in the 3 μm wavelength range. Such broadband optical sources are relevant for spectroscopic applications in the mid infrared range where the fundamental rotational-vibrational bands of most light molecules are found.
Lasers employing a new double-ridge waveguide design emit 18 mW at 3.57 μm and 20 mW at 3.37 μm. The top ridge confines the optical mode while the bottom ridge limits lateral current spreading.
We demonstrate single-mode distributed-feedback quantum cascade lasers at 4.75 μm with etched index-coupled surface gratings and spin-on dielectric infilling. We observe continuous wave laser emission at room temperature with 5 W of electrical power consumption.
We report on the phase noise properties of DFB lasers operating near 2.0 μm. Measured noise spectra indicate intrinsic linewidths below 1 kHz. Less than 200 kHz effective linewidth is estimated for 5 ms measurement time.
We report single spatial mode diode lasers operating near 2.05 μm with room-temperature continuous-wave output power exceeding 100 mW. At 20 °C, threshold currents were near 25 mA (320 A/cm2).
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