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Updated: Jan 23, 2026

Simultaneous Label-Free Autofluorescence Multi-Harmonic Microscopy
Published on: August 29, 2025
Label-Free Multiphoton Microscopy: The Origin of Fluorophores and Capabilities for Analyzing Biochemical Processes
E A Shirshin1,2, B P Yakimov3, M E Darvin4
1Lomonosov Moscow State University, Faculty of Physics, Moscow, 119991, Russia. shirshin@lid.phys.msu.ru.
Abstract:
Multiphoton microscopy (MPM) is a method of molecular imaging and specifically of intravital imaging that is characterized by high spatial resolution in combination with a greater depth of penetration into the tissue. MPM is a multimodal method based on detection of nonlinear optical signals - multiphoton fluorescence and optical harmonics - and also allows imaging with the use of the parameters of fluorescence decay kinetics. This review describes and discusses photophysical processes within major reporter molecules used in MPM with endogenous contrasts and summarizes several modern experiments that illustrate the capabilities of label-free MPM for molecular imaging of biochemical processes in connective tissue and cells.
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