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We present GaSb-based single-mode electrically-pumped VCSELs emitting at 3 and 3.9 μm. Continuous wave operation at thermo-electrically cooled temperatures and over 19 nm of electro-thermal tuning range are achieved.
GaSb-based electrically-pumped vertical-cavity surface-emitting lasers at 3.93 μm, using type-II quantum wells are analyzed. Current broadening due to radial diffusion of carriers in the active region is estimated to be 4.2 μm and this is determined to be a major factor in limiting their performance.
We present THz surface emission by difference frequency generation in nonlinear quantum cascade lasers operating at room temperature. The device comprises two separate, transversely superimposed gratings, one for selective feedback of the mid-infrared modes and one for surface emission of the generated THz radiation. The mid-infrared grating is realized as a higher order, loss-coupled distributed...
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