FREQUENCY-MODULATION (FM) SPECTROSCOPY - THEORY OF LINESHAPES AND SIGNAL-TO-NOISE ANALYSIS
FREQUENCY-MODULATION (FM) SPECTROSCOPY - THEORY OF LINESHAPES AND SIGNAL-TO-NOISE ANALYSIS
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DOI：
10.1007/bf00688820
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发表时间：
1983-01-01
期刊：
影响因子：
--
通讯作者：
ORTIZ, C
中科院分区：
文献类型：
--
作者：
BJORKLUND, GC;LEVENSON, MD;ORTIZ, C
调频光谱学是一种新的光学外差光谱学方法，能够灵敏、快速地测量与窄光谱特征相关的吸收或色散。当探测波的调频光谱被感兴趣的光谱特征扭曲时，通过检测外差拍信号来测量吸收或色散。本文简要介绍了调频光谱工作的历史概况。导出了描述热信号性质的表达式。给出了各种实验条件下的理论线形。进行了信噪分析以确定最终的灵敏度极限。
Frequency modulation (FM) spectroscopy is a new method of optical heterodyne spectroscopy capable of sensitive and rapid measurement of the absorption or dispersion associated with narrow spectral features. The absorption or dispersion is measured by detecting the heterodyne beat signal that occurs when the FM optical spectrum of the probe wave is distorted by the spectral feature of interest. A short historical perspective and survey of the FM spectroscopy work performed to date is presented. Expressions describing the nature of the beat signal are derived. Theoretical lineshapes for a variety of experimental conditions are given. A signal-to-noise analysis is carried out to determine the ultimate sensitivity limits.