A 25-stage interband cascade laser with a W active region and a third hole quantum well for the suppression of leakage current has exhibited lasing in pulsed mode up to 286 K. A peak output power of 160 mW/facet and a slope efficiency of 197 mW/A per facet (1.1 photons per injected electron) were measured at 196 K. Above 200 K, the characteristic temperature was higher (T0=53 K) and the threshold current densities lower than for a previously reported W interband cascade laser without the third hole quantum well.
A 2.9 μm diode laser with InAs/GaSb/Ga0.75In0.25Sb/GaSb superlattice active region displays a maximum operating temperature of 260 K. At 200 K, the threshold current density is 1.1 kA/cm2 and the quantum efficiency is >15%. The peak output power per facet exceeds 800 mW at 100 K and 200 mW at 200 K for a 0.05% duty cycle.
Sensitivity of optimization of mid-infrared InAs/InGaSb laser active regions to temperature and composition variations Appl.We report an experimental and theoretical investigation of internal losses in optically pumped type-II lasers with InAs/GaSb/Ga 1Ϫx In x Sb/GaSb superlattice active regions. Whereas the losses are found to be moderate at 100 K (11-14 cm Ϫ1 ), they increase rapidly with increasing temperature ͑to 50-120 cm Ϫ1 at 200 K͒. Comparison with a detailed numerical simulation shows that the internal losses play a much more important role than Auger recombination or carrier/lattice heating in limiting the laser performance at high temperatures. Calculations of the temperature-dependent intervalence absorption cross sections show that losses of the magnitude observed experimentally can easily occur if one does not take special care to avoid resonances in all regions of the Brillouin zone. Practical design guidelines are presented. The superlattice lasers yield maximum peak output powers of up to 6.5 W per facet at 100 K and 3.5 W per facet at 180 K, threshold incident pump intensities as low as 340 W/cm 2 at 100 K, and Shockley-Read lifetimes Ͼ30 ns at 100 K. The Auger coefficients are suppressed ͑р1.6ϫ10 Ϫ27 cm 6 /s at Tϭ260 K͒ despite the intervalence resonances which produce the high internal losses.
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