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Technology

2022
Biosensors

Multi-Color Two-Photon Microscopic Imaging Based on a Single-Wavelength Excitation

Authors:

Yan, W., Huang, Y., Wang, L., Li, J., Guo, Y., Yang, Z., & Qu, J.

Keywords:

fluorescence microscopy, two-photon microscopy, multi-color imaging, signal separation

Abstract:

Two-photon probes with broad absorption spectra are beneficial for multi-color two-photon microscopy imaging, which is one of the most powerful tools to study the dynamic processes of living cells. To achieve multi-color two-photon imaging, multiple lasers and detectors are usually required for excitation and signal collection, respectively. However, one makes the imaging system more complicated and costly. Here, we demonstrate a multi-color two-photon imaging method with a single-wavelength excitation by using a signal separation strategy. The method can effectively solve the problem of spectral crosstalk by selecting a suitable filter combination and applying image subtraction. The experimental results show that the two-color and three-color two-photon imaging are achieved with a single femtosecond laser. Furthermore, this method can also be combined with multi-photon imaging technology to reveal more information and interaction in thick biological tissues.

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