Intensity detection of terahertz quantum cascade laser radiation using electro-optic sampling

被引：9
|
作者：
Rungsawang, R. [1 ]
Marshall, O. [1 ]
Freeman, J. R. [1 ]
Beere, H. E. [1 ]
Malik, S. [2 ]
Alton, J. [2 ]
Barbieri, S. [3 ]
Ritchie, D. A. [1 ]
机构：
[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[2] Teraview Ltd, Cambridge CB4 0WS, England
[3] Univ Paris 07, F-75205 Paris 13, France
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 19期
基金：
英国工程与自然科学研究理事会;
关键词：
birefringence; cadmium compounds; electro-optical effects; fibre lasers; high-speed optical techniques; II-VI semiconductors; quantum cascade lasers; submillimetre wave lasers;
D O I：
10.1063/1.3027474
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We demonstrate intensity detection of terahertz radiation from a 2 THz quantum cascade laser with nonsynchronized electro-optic (EO) sampling under crossed polarizers. The detection sensitivity is limited by the residual birefringence of the EO detection crystal. With 100 fs fiber laser pulses and a CdTe EO crystal, terahertz radiation with power less than 100 mu W was detected. A femtosecond gating pulse provides an ultrashort detection response that is potentially very useful for analyzing temporal performance of short pulsed radiation or observing fast phenomena probed by terahertz pulses.
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页数：3
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