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A Femtosecond Stimulated Raman Loss (fSRL) Microscope for Highly Sensitive Bond-Selective Imaging

机译:飞秒受激拉曼损耗(fSRL)显微镜用于高灵敏度键选择成像

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We demonstrate nonlinear vibrational imaging of isolated Raman bands by detecting femtosecond pulse stimulated Raman loss. Femtosecond pulse excitation produces a stimulated Raman loss signal that is 12 times larger than what picosecond pulse excitation produces. The strong signal allowed real-time, bond-selective imaging of deuterated palmitic acid-d_(31) inside live cells, and 3D sectioning of fat storage in live C. elegans. With the high peak power provided by femtosecond pulses, this system is highly compatible with other nonlinear optical modalities such as two-photon excited fluorescence. With most of the excitation power contributed by the Stokes beam in the 1.0 - 1.2 urn wavelength range, photodamage of biological samples was not observed.
机译:我们通过检测飞秒脉冲激发的拉曼损耗来演示孤立拉曼带的非线性振动成像。飞秒脉冲激发产生的受激拉曼损耗信号比皮秒脉冲激发产生的大12倍。强大的信号可以对活细胞内的氘代棕榈酸-d_(31)进行实时,键选择性成像,并可以对秀丽隐杆线虫中的脂肪进行3D切片。飞秒脉冲提供的高峰值功率使该系统与其他非线性光学模态(如双光子激发荧光)高度兼容。由于斯托克斯光束在1.0-1.2微米波长范围内贡献的大部分激发功率,未观察到生物样品的光损伤。

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