High-power continuous-wave midinfrared type-II “W” diode lasers

Canedy, C. L.; Bewley, W. W.; Lindle, J. R.; Vurgaftman, I.; Kim, C. S.; Kim, M.; Meyer, J. R.
May 2005
Applied Physics Letters;5/23/2005, Vol. 86 Issue 21, p211105
Academic Journal
A type-II “W” diode laser with five quantum well periods and emitting at λ≈3.5 μm operated in cw mode to T=218 K. A second device produced more than 500 mW of cw power at 80 K. The threshold current density at T=78 K was 31 A/cm2, and pulsed operation was observed to 317 K. Improvements over previous single-stage devices for this wavelength range may be attributed in part to high growth quality and also to the incorporation of transition regions that smooth discontinuities in the conduction-band profile.


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