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首页> 外文会议>Multiphoton Microscopy in the Biomedical Sciences VII; Progress in Biomedical Optics and Imaging; vol.8 no.19; Proceedings of SPIE-The International Society for Optical Engineering; vol.6442 >Single pulse interferometric coherent anti-Stokes Raman scattering (CARS)
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Single pulse interferometric coherent anti-Stokes Raman scattering (CARS)

机译：单脉冲干涉相干抗斯托克斯拉曼散射（CARS）

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摘要

The non-resonant background signal has been the major obstacle in coherent anti-Stokes Raman scattering (CARS) spectroscopy and microscopy. This unwanted background is generated by the electronic response of the sample. It not only obscures the desired signal but also results in spectral interference with the desired vibrationally resonant CARS signal, making it difficult to assign vibrational peaks using characteristic spontaneous Raman spectra. We show that the non-resonant background can be used as a local oscillator for spectral interferometric CARS spectroscopy. Two different techniques are discussed to extract the vibrationally resonant multiplex CARS spectrum and discriminate it against the much larger non-resonant background. The pump, Stokes and probe pulses are all selected inside a single broadband ultrafast pulse (bandwidth ～1800 cm~(-1)) by a phase- and/or polarization-controlled pulse-shaping technique. The first technique generates two spectral interference CARS signals simultaneously, and the normalized difference of these two signals provides an amplified background-free broadband resonant CARS spectrum over 400-1500 cm~(-1). The second method generates a single spectral interference CARS signal by a phase-only pulse shaping. A Fourier transform spectral interferometry (FTSI) method is used to retrieve the Raman-equivalent CARS spectrum from the measured spectral signal. Both methods enhance the resonant CARS signal by utilizing the non-resonant background as a local oscillator for homodyne mixing.
机译：非共振背景信号一直是相干反斯托克斯拉曼散射（CARS）光谱学和显微镜检查的主要障碍。这种有害的背景是由样品的电子响应产生的。它不仅模糊了所需的信号，而且导致与所需的振动共振CARS信号发生频谱干扰，从而使得难以使用特征性自发拉曼光谱来分配振动峰。我们表明，非共振背景可以用作光谱干涉式CARS光谱的本地振荡器。讨论了两种不同的技术来提取振动共振多路CARS频谱并将其与更大的非共振背景进行区分。通过相位和/或偏振控制的脉冲整形技术，在单个宽带超快脉冲（带宽〜1800 cm〜（-1））内选择泵浦，斯托克斯和探测脉冲。第一种技术同时产生两个频谱干扰CARS信号，这两个信号的归一化差提供了400-1500 cm〜（-1）的放大的无背景宽带谐振CARS频谱。第二种方法是通过仅相位脉冲整形来生成单个频谱干扰CARS信号。傅里叶变换光谱干涉法（FTSI）方法用于从测得的光谱信号中检索拉曼等效CARS光谱。两种方法都通过利用非共振背景作为零差混合的本地振荡器来增强共振CARS信号。

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