Integrated Terahertz pulse generation and amplification in quantum cascade lasers

被引：0

作者：

Dhillon, S. S. ^{[1
]}

Sawallich, S. ^{[1
]}

Jukam, N. ^{[1
]}

Oustinov, D. ^{[1
]}

Madeo, J. ^{[1
]}

Rungsawang, R. ^{[1
]}

Barbieri, S. ^{[2
]}

Filloux, P. ^{[2
]}

Sirtori, C. ^{[2
]}

Marcadet, X.

Tignon, J. ^{[1
]}

机构：

[1] Univ D Diderot, Ecole Normale Super, CNRS, Lab Pierre Aigrain,Univ P&M Curie,UMR 8551, F-75231 Paris 05, France

[2] Univ diderot Paris, Mat & Phenomenes Quantiques, F-75251 Paris 05, France

来源：

QUANTUM SENSING AND NANOPHOTONIC DEVICES VIII | 2011年 / 7945卷

关键词：

Quantum Cascade Laser; Terahertz; Amplification; THz time domain spectroscopy; GAIN MEASUREMENTS; EMISSION;

D O I：

10.1117/12.871526

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 (similar to 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 similar 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.

引用

页数：7

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