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arXiv 2401.01016physics.optics
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光学参量放大增强的无背景光谱

Optical-parametric-amplification-enhanced background-free spectroscopy

California Institute of Technology(加州理工学院)

Mingchen Liu, Robert M. Gray, Arkadev Roy, Luis Ledezma, Alireza Marandi

AI总结:

提出光学参量放大增强的无背景光谱方法,通过干涉仪抑制激发背景并选择性放大携带分子特征的自由感应衰减,将线性干涉测量的检测极限提高数量级。

摘要:

传统的吸收光谱由于激光源的不稳定性,在从强背景中分辨微小吸光度方面存在根本性困难。现有的宽带振动光谱无背景方法有助于缓解这一问题,但在实现低消光比或时间分辨场测量方面面临挑战。在这里,我们引入了光学参量放大增强的无背景光谱,其中首先通过干涉仪抑制激发背景,然后选择性放大携带分子特征的自由感应衰减。我们表明,该方法可以在不需要更低消光比或时间分辨测量的情况下,将线性干涉测量的检测极限进一步提高一个或多个数量级,这有利于痕量物种检测的传感应用。

英文摘要:

Traditional absorption spectroscopy has fundamental difficulty in resolving small absorbance from strong background due to the instability of laser sources. Existing background-free methods in broadband vibrational spectroscopy help to alleviate this problem but face challenges in realizing either low extinction ratios or time-resolved field measurements. Here, we introduce optical-parametric-amplification-enhanced background-free spectroscopy, in which the excitation background is first suppressed by an interferometer and then the free-induction decay that carries molecular signatures is selectively amplified. We show that this method can further improve the limit of detection in linear interferometry by order(s) of magnitude without requiring lower extinction ratios or time-resolved measurement, which can benefit sensing applications in detecting trace species.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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