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arXiv 2304.08005physics.optics
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基于混合双光梳源的超高速相干反斯托克斯拉曼光谱

Ultra-high-speed coherent anti-Stokes Raman spectroscopy with a hybrid dual-comb source

Tianjian Lv, Bing Han, Ming Yan, Zhaoyang Wen, Kun Huang, Kangwen Yang, Heping Zeng

AI总结:

本文提出一种混合双光梳CARS系统,结合宽带光纤激光器与灵活电光频率梳,在1 MHz刷新率下实现2800–3200 cm⁻¹光谱测量,速度比现有系统高一个数量级,并演示了液体混合物的快速光谱成像。

摘要:

利用时间延迟超短脉冲和单像素光电探测器的相干反斯托克斯拉曼散射(CARS)光谱已在化学和生物研究中的光谱成像与瞬态研究方面展现出巨大潜力。然而,这些系统依赖机械延迟线或重复频率不可灵活调节的两台异步光学频率梳,在技术上限制了其采集速度。在此,我们展示了一种混合双光梳CARS系统,该系统结合了一台宽带光纤激光器和一台高度灵活的频率调制电光频率梳。我们在射频合成器所限制的最大1 MHz刷新率下,获得了多重CARS光谱(2800–3200 cm⁻¹),并具有中等分辨率(22 cm⁻¹)。针对液体混合物,我们演示了快速光谱CARS成像。我们的系统能够在高波数C–H伸缩振动区域以创纪录的速度进行光谱测量,该速度比现有最先进系统高出一个数量级,这可能为快速化学传感和成像开辟新的机遇。

英文摘要:

Coherent anti-Stokes Raman scattering (CARS) spectroscopy with time-delayed ultrashort pulses and a single-pixel photodetector has shown great potential for spectroscopic imaging and transient studies in chemistry and biological research. However, those systems rely on mechanical delay lines or two asynchronous optical combs with inflexible repetition frequencies, technically limiting their acquisition speeds. Here, we demonstrate a hybrid dual-comb CARS system involving a broadband fiber laser and a highly-flexible, frequency-modulated electro-optic comb. We achieve multiplex CARS spectra (2800-3200 cm-1), with a moderate resolution (22 cm-1), at a maximum refresh rate of 1 MHz, limited by the radio-frequency synthesizer we use. Fast spectroscopic CARS imaging is demonstrated for liquid mixtures. Our system enables spectral measurements in the high-wavenumber C-H stretching region at a record speed that is an order of magnitude higher than state-of-the-art systems, which may open up new opportunities for fast chemical sensing and imaging.

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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