Interferometrically Enhanced Intensity and Wavelength Modulation in Tunable Diode Laser Spectroscopy

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-08-08 DOI:10.3390/photonics11080740

Sander Vervoort, Marcus Wolff

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引用次数: 0

Abstract

Tunable diode laser spectroscopy (TDLS) is a measurement technique with high spectral resolution. It is based on tuning the emission wavelength of a semiconductor laser by altering its current and/or its temperature. However, adjusting the wavelength leads to a change in emission intensity. For applications that rely on modulated radiation, the challenge is to isolate the true spectrum from the influence of extraneous instrumental contributions, particularly residual intensity and wavelength modulation. We present a novel approach combining TDLS with interferometric techniques, exemplified by the use of a Mach–Zehnder interferometer, to enable the separation of intensity and wavelength modulation. With interferometrically enhanced intensity modulation, we reduced the residual wavelength modulation by 83%, and with interferometrically enhanced wavelength modulation, we almost completely removed the residual derivative of the signal. A reduction in residual wavelength modulation enhances the spectral resolution of intensity-modulated measurements, whereas a reduction in residual intensity modulation improves the signal-to-noise ratio and the sensitivity of wavelength-modulated measurements.

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可调谐二极管激光光谱学中的干涉仪增强型强度和波长调制

可调二极管激光光谱（TDLS）是一种具有高光谱分辨率的测量技术。它的原理是通过改变半导体激光器的电流和/或温度来调整其发射波长。然而，调整波长会导致发射强度发生变化。对于依赖于调制辐射的应用，面临的挑战是如何将真实光谱与外来仪器贡献的影响（尤其是残余强度和波长调制）隔离开来。我们提出了一种将 TDLS 与干涉测量技术相结合的新方法，例如使用马赫-泽恩德干涉仪，以实现强度和波长调制的分离。利用干涉仪增强的强度调制，我们将残余波长调制减少了 83%；利用干涉仪增强的波长调制，我们几乎完全消除了信号的残余导数。减少残余波长调制可提高强度调制测量的光谱分辨率，而减少残余强度调制则可提高信噪比和波长调制测量的灵敏度。

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.