High performance terahertz quantum cascade lasers

Nanowire terahertz quantum cascade lasers

Performance of Phonon Depopulated Terahertz Quantum Cascade Lasers

Ch. Deutsch1, A. Benz1, G. Fasching1, K. Unterrainer1, A. M. Andrews2, P. Klang2, W. Schrenk2, and G. Strasser2 1 Photonics Institute and Center for Microand Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, 1040 Vienna, Austria 2 Institute of Solid-State Electronics and Center for Microand Nanostructures, Vienna University of Technology, Floragasse 7/362, 1040 Vienna, Au...

High-Power Growth-Robust InGaAs/InAlAs Terahertz Quantum Cascade Lasers

We report on high-power terahertz quantum cascade lasers based on low effective electron mass InGaAs/InAlAs semiconductor heterostructures with excellent reproducibility. Growth-related asymmetries in the form of interface roughness and dopant migration play a crucial role in this material system. These bias polarity dependent phenomena are studied using a nominally symmetric active region resu...

High-temperature operation of broadband bidirectional terahertz quantum-cascade lasers

Terahertz quantum cascade lasers (QCLs) with a broadband gain medium could play an important role for sensing and spectroscopy since then distributed-feedback schemes could be utilized to produce laser arrays on a single semiconductor chip with wide spectral coverage. QCLs can be designed to emit at two different frequencies when biased with opposing electrical polarities. Here, terahertz QCLs ...

Terahertz photonic crystal quantum cascade lasers.

We combine photonic crystal and quantum cascade band engineering to create an in-plane laser at terahertz frequency. We demonstrate that such photonic crystal lasers strongly improve the performances of terahertz quantum cascade material in terms of threshold current, waveguide losses, emission mode selection, tunability and maximum operation temperature. The laser operates in a slow-light regi...