Two Photon Microscopy and Second Harmonic Generation
نویسنده
چکیده
Nonlinear microscopy has become an important tool for imaging biological samples such as neurons. In two photon fluorescence, a fluorophore absorbs two photons at a low energy state, one of its electrons briefly converts to a higher energy state, and it emits a single excited photon at an energy level higher than that of the absorbed photons. In second harmonic generation (SHG), laser light is focused on a sample to generate frequency-doubled light: two photons of one wavelength are annihilated and a single photon of half the wavelength is generated.
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