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]

引用

页数：3

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