A comparative study of pump-probe photothermal spectroscopy using mach-zehnder interferometer and in-fiber mode interferometer

IF 3.5 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2024-11-20 DOI:10.1016/j.optlaseng.2024.108695

Mengyuan Hu , Chenyu Yao , Mai Hu , Chao Wei , Wei Ren

引用次数: 0

Abstract

We report a comparative study of mid-infrared photothermal spectroscopy using a Mach-Zehnder interferometer and an in-fiber mode interferometer using a tellurite hollow-core antiresonant fiber (HC-ARF). A quantum cascade laser (QCL) at 5.26 µm serves as the pump laser and is coupled into the HC-ARF to detect nitric oxide (NO). In both interferometric setups, a 1.55 µm probe laser is used to measure the phase variation induced by absorption. The Mach-Zehnder interferometer uses a servo-loop feedback control to achieve quadrature point operation, while the mode interferometer uses passive stabilization based on common mode rejection. With a fiber length of 35 cm, we achieve a noise equivalent concentration of 60 ppb with the Mach-Zehnder interferometer and 0.8 ppb with the mode interferometer. In addition, the response of the sensor to modulation parameters, gas concentration, pump power and long-term stability is also discussed in this study.

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用马赫-曾德尔干涉仪和光纤模式干涉仪进行泵浦探针光热光谱的比较研究

我们报道了使用马赫-曾德干涉仪和使用碲空心芯抗谐振光纤（HC-ARF）的光纤内模式干涉仪的中红外光热光谱的比较研究。波长5.26µm的量子级联激光器（QCL）作为泵浦激光器，耦合到HC-ARF中检测一氧化氮（NO）。在两种干涉装置中，使用1.55 μ m探针激光器测量吸收引起的相位变化。Mach-Zehnder干涉仪使用伺服回路反馈控制来实现正交点操作，而模式干涉仪使用基于共模抑制的被动稳定。在光纤长度为35 cm的情况下，我们使用马赫-曾德干涉仪实现了60 ppb的等效噪声浓度，使用模干涉仪实现了0.8 ppb的等效噪声浓度。此外，本文还讨论了传感器对调制参数、气体浓度、泵功率和长期稳定性的响应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques