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요약정보
光学反馈线性腔衰荡光谱技术不确定性 / Uncertainty of optical feedback linear cavity ringdown spectroscopy
Resource Type
Academic Journal
Authors
王兴平
;
赵刚
;
焦康
;
陈兵
;
阚瑞峰
;
刘建国
;
马维光
;
Wang Xing-Ping
;
Zhao Gang
;
Jiao Kang
;
Chen Bing
;
Kan Rui-Feng
;
Liu Jian-Guo
;
Ma Wei-Guang
Source
物理学报 / Acta Physica Sinica
. 71(12):43-51
Subject
光学反馈
腔衰荡
线性腔
高灵敏
Language
Chinese
ISSN
1000-3290
Online Access
Web of Science
Scopus
JCR 저널정보
초록
腔衰荡光谱技术是一种高灵敏的腔增强分子吸收光谱测量技术,?由于激光频率噪声大,?导致激光到腔耦合效率低,?严重限制了其对痕量气体的探测灵敏度.?光学反馈可以有效压窄半导体激光器的线宽,?提高激光到外部谐振腔的耦合效率.?本文基于精细度为7800的Fabry-Pérot腔,?发展了光学反馈线性腔衰荡光谱技术.首先从光场相位的角度给出了线性腔光学反馈的原理,?然后分析了影响测量不确定性的因素,?包括光学反馈率、衰荡信号触发阈值、探测器相对透射汇聚光斑位置等.?实验结果表明,?通过设置低反馈率(3%自由光谱区间)、高衰荡信号触发阈值(90%腔模幅度)以及将光斑聚焦到探测器有效面中心等措施,?结合光学反馈效应,?可将空腔衰荡时间的相对不确定度提升至0.026%,?远优于传统腔衰荡技术获得的典型值.?系统在积分时间为180?s时,?获得探测灵敏度为1.3?×?10–10?cm–1,?对应甲烷的最小可探测吸收体积浓度为0.35?×?10–9,?从而满足了碳监测的要求.
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