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Proceedings Paper

Integrated terahertz pulse generation and amplification in quantum cascade lasers
Author(s): S. S. Dhillon; S. Sawallich; N. Jukam; D. Oustinov; J. Madéo; R. Rungsawang; S. Barbieri; P. Filloux; C. Sirtori; X. Marcadet; J. Tignon
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Paper Abstract

Integrated terahertz (THz) pulse generation and amplification in a THz quantum cascade laser (QCL) is demonstrated. Intra-cavity THz pulses are generated by exciting the facet of the quantum cascade laser with an ultrafast Ti:Sapphire laser (~100fs) and detected using electro-optic sampling. Maximum THz field emission is found with an interband transition of 1.535eV (809nm) and by narrowing the excitation laser bandwidth to ~3THz. These resonance conditions correspond to the narrowband excitation of the quantum cascade miniband, indicating that the THz pulse is generated by the photo-excited carriers that are accelerated by the applied field. The generated pulse is subsequently amplified by the narrowband gain of the laser as it propagates through the QCL cavity. As an integrated THz generator-amplifier, the technique avoids the issues associated with the coupling of external THz pulses into sub-wavelength dimensioned cavities.

Paper Details

Date Published: 24 January 2011
PDF: 7 pages
Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79450B (24 January 2011); doi: 10.1117/12.871526
Show Author Affiliations
S. S. Dhillon, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)
S. Sawallich, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)
N. Jukam, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)
D. Oustinov, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)
J. Madéo, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)
R. Rungsawang, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)
S. Barbieri, Univ. Paris 7-Denis Diderot (France)
P. Filloux, Univ. Paris 7-Denis Diderot (France)
C. Sirtori, Univ. Paris 7-Denis Diderot (France)
X. Marcadet, Alcatel-Thales III-V Lab. (France)
J. Tignon, Lab. Pierre Aigrain, CNRS, Ecole Normale Supérieure (France)


Published in SPIE Proceedings Vol. 7945:
Quantum Sensing and Nanophotonic Devices VIII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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