Quantum-cascade lasers without injector regions

A. Friedrich; M.-C. Amann

doi:10.1117/12.697562

26 February 2007 Quantum-cascade lasers without injector regions

A. Friedrich, M.-C. Amann

Author Affiliations +

Proceedings Volume 6485, Novel In-Plane Semiconductor Lasers VI; 648507 (2007) https://doi.org/10.1117/12.697562
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We present the status of quantum-cascade lasers without injector regions, based on a four- and five-level staircase, respectively. First lasers were realized at a wavelength of ~ 10 &mgr;m. By applying an optimized design, we achieved high performance injectorless quantum-cascade lasers emitting at ~ 6.7 &mgr;m. On the basis of this design, we investigated the influence of doping density and the number of periods of active sections. A sample with a doping sheet density of 2.5x10¹⁰ cm^-2 and 60 periods of active sections shows record low threshold current densities of 0.75 kA/cm² at 300 K. Recently, we have further extended the wavelength range even down to ~ 4.2 &mgr;m.

Citation Download Citation

A. Friedrich and M.-C. Amann "Quantum-cascade lasers without injector regions", Proc. SPIE 6485, Novel In-Plane Semiconductor Lasers VI, 648507 (26 February 2007); https://doi.org/10.1117/12.697562

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