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碘分子吸收稳定中红外差频激光频率

Frequency Stabilization of Mid-Infrared Difference Frequency Laser by Iodine Molecule Absorption

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摘要

差频光源用于大气分子稳定同位素丰度研究需要频率稳定的连续输出的空闲光。基于连续可调谐钛宝石激光器和单频连续NdYAG激光器建立差频系统,为了稳定差频系统产生的红外光源的波长,利用MgOPPLN作为倍频晶体,采用有多普勒展宽的碘分子吸收稳频方法,结合数字比例积分微分(PID)反馈控制技术,将NdYAG激光器的频率漂移量稳定在1.2 MHz/h内,稳定度为4.26×10-9。实验结果表明:增加对压电陶瓷(PZT)的调制电压时,NdYAG激光在1 h内的频率漂移量迅速减小,超过1 V后漂移量趋于稳定;改变对PZT调制频率没有获得较高的稳定度。将频率稳定后的NdYAG激光用于产生3.42 μm附近的差频光源,通过对低压下CH4气体分子吸收谱线的测量,去卷积运算得到差频系统的线宽约为6.9 MHz。实验结果既为该方法用于稳定激光频率提供了重要的参考,又为痕量气体探测提供了频率稳定的差频光源。

Abstract

Difference frequency laser used for the study of atmospheric molecule isotope abundance requires stable frequency and continuous idler radiation. A difference frequency generation (DFG) system is established based on a tunable continuous wave (CW) Tisapphire laser and a CW single-frequency NdYAG laser. In the DFG system, frequency stabilization method of iodine molecule Doppler-broadened absorption combined with digital proportion integration differentiation (PID) feedback control technology is adopted to stabilize the wavelength of infrared laser arised from the DFG system, while MgOPPLN is used as the frequency doubling crystal. The NdYAG laser frequency shift is stabilized within 1.2 MHz/h and the stability is 4.26×10-9. The experimental results show that the frequency shift within 1 h of NdYAG laser decreases rapidly with the increase of the voltage loaded on piezoelectric ceramic (PZT), but smaller shift is not achieved beyond 1 V; better stability is not achieved by changing the frequency of modulation voltage. NdYAG laser with stabilized frequency is used to generate difference frequency laser near 3.42 μm. By detecting low pressure absorption line of CH4, the 6.9 MHz line width of this difference frequency system is derived. The results provide not only an important reference for laser frequency stabilization by this technology, but also a stable difference frequency laser for trace gas detection.

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中图分类号:TN248.1

DOI:10.3788/cjl201441.0702006

所属栏目:激光物理

基金项目:国家自然科学基(41205021,41175036)、中国科学院大气成分与光学重点实验室开放基)

收稿日期:2014-01-22

修改稿日期:2014-02-27

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孙明国:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031中国科学院安徽光学精密机械研究所大气物理化学研究室, 安徽 合肥 230031
马宏亮:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031
王贵师:中国科学院安徽光学精密机械研究所大气物理化学研究室, 安徽 合肥 230031
汪磊:中国科学院安徽光学精密机械研究所大气物理化学研究室, 安徽 合肥 230031
曹振松:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031
梁万国:中国科学院福建物质结构研究所, 福建 福州 350002
陈怀曦:中国科学院福建物质结构研究所, 福建 福州 350002
周煌:中国科学院福建物质结构研究所, 福建 福州 350002
邹小林:中国科学院福建物质结构研究所, 福建 福州 350002
陈卫东:中国科学院安徽光学精密机械研究所大气物理化学研究室, 安徽 合肥 230031法国滨海大学大气物理化学实验室, 法国 敦刻尔克 59140
高晓明:中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室, 安徽 合肥 230031中国科学院安徽光学精密机械研究所大气物理化学研究室, 安徽 合肥 230031

联系人作者:孙明国(sunmguo@ahpu.edu.cn)

备注:孙明国(1981—),男,博士研究生,主要从事大气分子稳定同位素丰度探测技术方面的研究。

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引用该论文

Sun Mingguo,Ma Hongliang,Wang Guishi,Wang Lei,Cao Zhensong,Liang Wanguo,Chen Huaixi,Zhou Huang,Zou Xiaolin,Chen Weidong,Gao Xiaoming. Frequency Stabilization of Mid-Infrared Difference Frequency Laser by Iodine Molecule Absorption[J]. Chinese Journal of Lasers, 2014, 41(7): 0702006

孙明国,马宏亮,王贵师,汪磊,曹振松,梁万国,陈怀曦,周煌,邹小林,陈卫东,高晓明. 碘分子吸收稳定中红外差频激光频率[J]. 中国激光, 2014, 41(7): 0702006

被引情况

【1】赵刚,蒋旭东,吕新杰,秦亦强. 基于光学超晶格的四波长近-中红外光参量振荡器. 中国激光, 2015, 42(5): 502004--1

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