Thermo-optic detection of terahertz radiation from a quantum cascade laser

被引：6
|
作者：
van Kolck, A. [1 ]
Amanti, M. [1 ]
Fischer, M. [1 ]
Beck, M. [1 ]
Faist, J. [1 ]
Lloyd-Hughes, J. [2 ]
机构：
[1] ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland
[2] Univ Oxford, Clarendon Lab, Dept Phys, Oxford OX1 3PU, England
来源：
APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 25期
基金：
英国工程与自然科学研究理事会; 瑞士国家科学基金会;
关键词：
ELECTROOPTIC DETECTION; CRYSTALS; SPECTROSCOPY;
D O I：
10.1063/1.3528456
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigate the asynchronous detection of terahertz radiation from a quantum cascade laser using an electro-optic sampling apparatus. The signal does not vary substantially upon rotating the detection crystal, while a characteristic angle dependence is exhibited for synchronized time-domain pulses from a photoconductive emitter. Upon increasing the electrical modulation frequency of the cascade laser the unsynchronized signal decreases in good agreement with a thermal detector. Rather than being electro-optic in origin, we therefore ascribe the unsynchronized signal to a thermo-optic modulation of the refractive index. A simple model is in good agreement with the effect's frequency dependence. (C) 2010 American Institute of Physics. [doi:10.1063/1.3528456]
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页数：3
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