Broadband Surface-Enhanced Mid-Infrared Laser Spectroscopy With Adaptive Spectrum Compensation

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2025-02-05 DOI:10.1109/LPT.2025.3539291

Jing Ni;Zhouzhuo Tang;Zihao Liu;Qijie Wang;Xia Yu

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引用次数: 0

Abstract

External cavity-quantum cascade lasers (EC-QCLs) offer high spectral power density (SPD) over several hundred wavenumbers, making them ideal for broadband mid-infrared absorption spectroscopy. Surface-enhanced infrared absorption spectroscopy (SEIRA) leverages nanoantenna structure to enhance the signal in an infrared absorption spectrum. However, the highly uneven SPD of the EC-QCL and strong absorption of the SEIRA nanoantennas challenge the limited dynamic range of the detection system and thus introduce higher noise levels. Here, an adaptive spectrum compensation (ASC) method is proposed and applied in our home-built broadband surface-enhanced mid-infrared laser absorption spectrometer. The ASC method adaptively optimizes the laser beam and adjusts the SPD of the spectra reaching the detector with minimal loss. This reduces the dynamic range noise, detector noise and shot noise of the detection system, and allows quick adaptive switching between different background spectra. For our spectrometer, the ASC method has reduced the noise level of the absorption spectrum across 1660-975 cm−1 by more than 3 times. The proposed simple and low-cost spectrum compensation method could be applied to other tunable laser absorption spectroscopies with highly uneven SPD.

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自适应光谱补偿的宽带表面增强中红外激光光谱学

外腔量子级联激光器（ec - qcl）提供超过几百个波数的高光谱功率密度（SPD），使其成为宽带中红外吸收光谱的理想选择。表面增强红外吸收光谱（SEIRA）利用纳米天线结构来增强红外吸收光谱中的信号。然而，EC-QCL的高度不均匀SPD和SEIRA纳米天线的强吸收对检测系统有限的动态范围提出了挑战，从而引入了更高的噪声水平。本文提出了一种自适应光谱补偿方法，并将其应用于自制的宽带表面增强中红外激光吸收光谱仪中。ASC方法自适应优化激光束，以最小的损耗调整到达探测器的光谱SPD。这降低了检测系统的动态范围噪声、探测器噪声和弹丸噪声，并允许在不同背景光谱之间快速自适应切换。对于我们的光谱仪，ASC方法将1660-975 cm−1吸收光谱的噪声水平降低了3倍以上。所提出的简单、低成本的光谱补偿方法可应用于其他SPD高度不均匀的可调谐激光吸收光谱。

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

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.