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Photobleaching resistance of stimulated parametric emission in microscopy

机译:显微镜中受激参量发射的耐光漂白性

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Photobleaching of organic fluorescent labels is a ubiquitous problem in fluorescence microscopy, limiting imaging capabilities and presenting hurdles to quantitative biophysical measurements. We report here that a nonlinear optical signal from some organic fluorophores persists in the presence of photobleaching. Specifically, a four-wave mixing process that is enhanced by a two-photon absorption resonance in the target fluorophore, termed stimulated parametric emission (SPE), is essentially unaffected by the photobleaching of the fluorophore, for rhodamine 6G and other commercial green and red fluorophores. The stability of the SPE signal, and the ability to image weakly or nonfluorescent chromophores, should make this nonlinear microscopy useful for quantitative biophysical measurements.
机译:有机荧光标记的光漂白是荧光显微镜中普遍存在的问题,它限制了成像能力,并给定量生物物理测量带来了障碍。我们在这里报告,来自某些有机荧光团的非线性光信号在存在光漂白的情况下仍然存在。具体来说,对于若丹明6G和其他商品绿色和红色,通过目标荧光团中的两个光子吸收共振增强的四波混合过程(称为受激参量发射(SPE))基本上不受荧光团的光漂白的影响。荧光团。 SPE信号的稳定性以及对弱或非荧光发色团成像的能力,应使这种非线性显微镜对定量生物物理测量有用。

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