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HL: Halbleiterphysik

HL 2: Symposium THz-quantum cascade lasers

HL 2.2: Fachvortrag

Monday, March 27, 2006, 10:45–11:15, HSZ 01

THz generation and mixing using Quantum Cascade Lasers — •Carlos Sirtori — Matériaux et Phénomènes Quantiques, Université Denis Diderot - Paris 7, Paris, France

THz quantum cascade (QC) lasers are electrically pumped semiconductor devices based on electronic intersubband transition in quantum wells. Recently, we have been investigating lasers with emission frequency at 3THz and 1.9THz (λ = 100µm and λ = 160µm). The latter is the longest wavelength ever achieved in QC lasers without the help of a magnetic field. At 3THz we were able to obtain 100mW of peak power and a maximum operating temperature of 100K. After a brief introduction on the state-of-the-art, I will present our results on novel THz waveguide structures, allowing "buried" structures and ultra-low threshold currents. Finally, I will introduce a scheme in which a beam at telecom frequencies can be injected into a QC lasers for coherent THz modulation and up-conversion.