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Improvement of lambda ~ 5 µm quantum cascade lasers by blocking barriers in the active regions

Verbesserung von lambda ~ 5 µm Quantenkaskadenlasern durch Sperr-Barrieren in den aktiven Bereichen
: Yang, Q.K.; Mann, C.; Fuchs, F.; Kiefer, R.; Köhler, K.; Rollbühler, N.; Schneider, H.; Wagner, J.


Applied Physics Letters 80 (2002), Nr.12, S.2048-2050
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IAF ()
blocking barrier; Sperrbarriere; mid infrared; mittleres Infrarot; quantum cascade laser; Quantenkaskadenlaser; active region; aktiver Bereich; strain compensating layers

We report the improvement of quantum cascade lasers emitting at lambda ~5 mu m by introducing AlAs blocking barriers together with strain- compensating InAs layers into the active regions. The blocking barriers are designed to selectively prevent electrons in the initial laser state from tunneling out of the active region, while maintaining the high tunneling probabilities of the electrons in the final laser states. Adopting blocking barriers, the maximum peak power per facet at 77 K (300 K) is increased from 285 (30 mW) to 900 mW (240 mW), and the maximum operation temperature in pulsed mode has been improved from 320 to 350 K with respect to a reference sample without blocking barriers.