Active modulation of intracavity laser intensity with the Pound-Drever-Hall locking for photoacoustic spectroscopy

doi:10.1364/ol.386523

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	Active modulation of intracavity laser intensity with the Pound-Drever-Hall locking for photoacoustic spectroscopy
	Z. Wang, H. Y. Wei, Y. Li, R. F. Kan and W. Ren
	2020
发表期刊	Optics Letters
ISSN	0146-9592
卷号	45 期号:5 页码:1148-1151
摘要	Here we report a novel, to the best of our knowledge, method of active intracavity intensity modulation for cavity-enhanced photoacoustic spectroscopy (PAS) without the need for any external optical modulators. Based on the Pound-Drever-Hall (PDH) locking technique, a dither is added to the PDH error signal to periodically vary the locking point between the laser frequency and optical cavity within a sub-MHz frequency range. While significantly enhancing the intracavity laser intensity, the optical cavity also acts as an intensity modulator. As a proof-of-principle, we demonstrated the PAS of C2H2 by placing a photoacoustic cell ( Q-factor similar to 10) inside a Fabry-Perot cavity (finesse similar to 628) and adopting the proposed intracavity intensity modulation scheme. By detecting the weak C2H2 line at 6412.73 cm(-1), the sensor achieves a normalized noise equivalent absorption (NNEA) coefficient of 1.5 x 10(-11) cm(-1)WHz(-1/2). This method enables the continuous locking of laser frequency and optical cavity, and it achieves the intracavity intensity modulation with an adjustable modulation depth as well. (C) 2020 Optical Society of America
DOI	10.1364/ol.386523
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收录类别	SCI ; EI
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64285
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Z. Wang, H. Y. Wei, Y. Li, R. F. Kan and W. Ren. Active modulation of intracavity laser intensity with the Pound-Drever-Hall locking for photoacoustic spectroscopy[J]. Optics Letters,2020,45(5):1148-1151.
APA	Z. Wang, H. Y. Wei, Y. Li, R. F. Kan and W. Ren.(2020).Active modulation of intracavity laser intensity with the Pound-Drever-Hall locking for photoacoustic spectroscopy.Optics Letters,45(5),1148-1151.
MLA	Z. Wang, H. Y. Wei, Y. Li, R. F. Kan and W. Ren."Active modulation of intracavity laser intensity with the Pound-Drever-Hall locking for photoacoustic spectroscopy".Optics Letters 45.5(2020):1148-1151.

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