Difference frequency generation in periodically poled lithium niobate and its use in the detection of atmospheric methane

被引：31

作者：

Clark, HY

Corner, L

Denzer, W

Hancock, G

Hutchinson, A

Islam, M

Peverall, R

Ritchie, GAD

机构：

[1] Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England

[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[3] Univ Teesside, Sch Sci & Technol, Middlesbrough TS1 3BA, Cleveland, England

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 399卷 / 1-3期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1016/j.cplett.2004.09.146

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Continuous wave mid-infrared radiation at 3.36 mum (power approximate to 18 muW) has been produced by difference frequency generation of the fundamental of a YAG laser at 1064 nm (220 mW) with a fibre pigtailed DFB diode laser operating at 1560 nm (50 mW) in periodically poled lithium niobate. The idler radiation has been used to make real-time measurements of ambient methane present in our laboratory using wavelength modulation spectroscopy via the P(4) multiplet transitions within the v(3) band. We demonstrate a minimum detectable concentration of 47 ppb over a path length of 0.71 m in a 1 s observation time. Measurements of the pressure broadening and shift parameters for these lines are presented for methane in the presence of air, nitrogen and argon. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：102 / 108

页数：7

共 26 条

[1] INTERACTIONS BETWEEN LIGHT WAVES IN A NONLINEAR DIELECTRIC [J].