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基于中红外差频激光测量水汽分子同位素丰度
引用本文:王竹青,王欢,曹振松,袁怿谦,张为俊,龚知本,高晓明.基于中红外差频激光测量水汽分子同位素丰度[J].光谱学与光谱分析,2009,29(12).
作者姓名:王竹青  王欢  曹振松  袁怿谦  张为俊  龚知本  高晓明
作者单位:1. 中国科学院安徽光学精密机械研究所大气光学实验室,安徽合肥,230031;中国科学院安徽光学精密机械研究所环境光谱学研究室,安徽合肥,230031
2. 中国科学院安徽光学精密机械研究所大气光学实验室,安徽合肥,230031
3. 中国科学院安徽光学精密机械研究所环境光谱学研究室,安徽合肥,230031
基金项目:中国科学院重大科研装备项目和国家"863"高技术项目支持资助 
摘    要:稳定同位素比值的测量在地质学、气象学和地球科学的研究中具有蕈要的应用价值.水汽同位素丰度的测量对理解与干旱相关的同温层大气科学具有重要的意义.水汽分子在2.7 μm附近具有较强的吸收,适宜于高灵敏度光谱的测量.文章报道了利用差频技术(Difference frequency generation)和准相位匹配技术(Quasi-phase matching),将调}皆范围在750~840 nm之间的连续可调谐钛宝石激光器和单频连续的Nd:YAG敫光器,耦合到周期性极化铌酸锂非线性光学晶体中,产生2.5~4 μn波段的中红外可调谐激光.选择周期为20μm的PPLN品体,产生2.7 μm附近的中红外差频激光,利用差频产生的中红外激光光源,具有窄线宽、宽调谐等优点.结合光程为100 m的Herriott型多通吸收池,采用直接吸收光谱方法测量了实验窒大气中的水汽分子同位素,得到了同位素比值R及~(17)O,~(18)O,D的丰度值δ,实验所测R值与国际标准具有很好的一致性.

关 键 词:水汽  差频  中红外  同位素测量

The Measurement of Water Vapor Isotope Based on Mid-Infrared Difference Frequency Generation
WANG Zhu-qing,WANG Huan,CAO Zhen-song,YUAN Yi-qian,ZHANG Wei-jun,GONG Zhi-ben,GAO Xiao-ming.The Measurement of Water Vapor Isotope Based on Mid-Infrared Difference Frequency Generation[J].Spectroscopy and Spectral Analysis,2009,29(12).
Authors:WANG Zhu-qing  WANG Huan  CAO Zhen-song  YUAN Yi-qian  ZHANG Wei-jun  GONG Zhi-ben  GAO Xiao-ming
Institution:WANG Zhu-qing1,2,WANG Huan1,CAO Zhen-song1,YUAN Yi-qian1,ZHANG Wei-jun2,GONG Zhi-ben1,GAO Xiao-ming1,2 1.Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China2.Environmental Spectroscopy Laboratory,Hefei230031,China
Abstract:Stable-isotope ratio analysis of water is an important tool for geology, meteorology, and earth sciences. Measure-ments of water vapor isotopes are very helpful to explaining stratospheric aridity and related issues in atmospheric sciences. The absorption of water vapor near 2. 7μm is very strong so it is suitable for measuring high sensitivity spectra. Based on difference frequency generation and quasi-phase matching, by mixing an Nd : YAG laser with Ti : Sapphire tunable from 750 to 840 nm in a 50 mm long periodically poled lithium niobate (PPLN) crystal, a widely tunable CW laser source was generated for the mid-in-frared spectral range from 2.5 to 4 μm. We chose A = 20 μm for PPLN crystal, the generated laser was around 2. 7 μm. This laser is widely tunable and of inherent narrow linewidth based on difference-frequency generation. Using this idler laser and 100 m multi-pass cell, and direct absorption the water vapor isotopes were measured in the laboratory air. The authors measured iso-topes ratios and δ~(17)O, δ~(18)O and δD. The values were found to be in excellent agreement with the standard value for three individ-ual lines.
Keywords:Water vapor  Difference-frequency-generation  Mid-infrared  Isotopes measurement
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