High‐Sensitivity, High‐Resolution Stimulated Raman Photoacoustic Spectroscopy Enabled by Continuous‐Wave Intracavity Pump‐Stokes Beams

IF 10 1区 物理与天体物理 Q1 OPTICS
Qinxue Nie, Guanda Lyu, Chao Wei, Wei Ren
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引用次数: 0

Abstract

Raman spectroscopy is essential for chemical analysis by offering non‐invasive and selective detection of molecular vibrations. However, weak Raman signals from gas‐phase species pose significant challenges to detection sensitivity, even with high‐power laser sources. Here, cavity‐enhanced stimulated Raman photoacoustic spectroscopy is reported using continuous‐wave mW‐level near‐infrared lasers, achieving remarkable sensitivity and resolution. This approach involves coupling the pump and Stokes beams into a high‐finesse (>220 000) Fabry‐Perot cavity, enhancing the intracavity power of both lasers by four orders of magnitude. By modulating the light intensity of the pump laser, the stimulated Raman scattering‐induced acoustic waves are sensitively detected by a microphone. Additionally, a difference frequency scanning method is introduced that resolves narrow‐linewidth Raman transitions by tuning the length of the dual‐laser‐locked optical cavity. The effectiveness of the method is validated by measuring the Raman rotational transition S0(0) of hydrogen, achieving a minimum detection limit of 0.5 ppm with a 200‐s averaging time. This study establishes a new Raman spectroscopic platform for high‐sensitivity, high‐resolution molecular spectroscopy, with promising applications in chemical analysis and trace gas sensing.
用连续波腔内泵-斯托克斯光束实现高灵敏度、高分辨率受激拉曼光声光谱
拉曼光谱通过提供分子振动的非侵入性和选择性检测,对化学分析至关重要。然而,来自气相物质的微弱拉曼信号对探测灵敏度构成了重大挑战,即使使用高功率激光源。本文报道了使用连续波毫瓦级近红外激光器的腔增强受激拉曼光声光谱,获得了显著的灵敏度和分辨率。这种方法包括将泵浦和Stokes光束耦合到一个高精细度(> 220,000) Fabry - Perot腔中,将两种激光器的腔内功率提高四个数量级。通过调制泵浦激光器的光强,麦克风可以灵敏地探测到受激拉曼散射引起的声波。此外,还介绍了一种差频扫描方法,该方法通过调整双激光锁定光腔的长度来解决窄线宽拉曼跃迁问题。通过测量氢的拉曼旋转跃迁S0(0)验证了该方法的有效性,达到了0.5 ppm的最低检测限,平均时间为200秒。本研究为高灵敏度、高分辨率分子光谱建立了一个新的拉曼光谱平台,在化学分析和痕量气体传感方面具有广阔的应用前景。
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来源期刊
CiteScore
14.20
自引率
5.50%
发文量
314
审稿时长
2 months
期刊介绍: Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications. As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics. The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.
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