Investigation of coherent acoustic phonons in THz quantum cascade laser structures

M. HETTICH; A. BRUCHHAUSEN; J. LLOYD-HUGHES; R. GEBS; A. BARTELS; M. FISCHER; M. BECK; G. SCALARI; J. FAIST; T. DEKORSY

Munich

Conferencia; The European Conference on Lasers and Electro-Optics and the XIIth European Quantum Electronics Conference (CLEO®/Europe-EQEC 2011)(CLEO/EQEC 2011)); 2011

European Physical Society

Coherent zone folded acoustic phonons in terahertz quantum cascade laser (QCL) structures [1] are investigated by high-speed asynchronous optical sampling [2]. This method is based on two Ti:sapphire lasers with repetitionrates of ~1 GHz respectively. The time delay between pump and probe pulse is achieved by an offset in repetition rate of 5kHz. This allows for fast scanning times without moving mechanical parts.