Continuous-wave emission of two midinfrared PbSe vertical-cavity surface-emitting laser structures is presented. For both structures, optically pumped cw laser emission is observed at a wavelength of about 7.9 μm. Stimulated emission is found up to temperatures of 80 K. We achieved internal threshold pump intensities of down to which is two orders of magnitude smaller than reported so far. The linewidth of the laser emission is only 18 μeV (0.9 nm) with a strong narrowing as compared to the linewidth of the cavity resonance. Continuous-wave output powers are up to 350 μW.
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