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Bit more complex than reflection. Reflection preserves the wavelength. Fluorescence is where light is absorbed, some energy is transformed to heat/motion, and t
by dexwiz 3y ago
Bit more complex than reflection. Reflection preserves the wavelength. Fluorescence is where light is absorbed, some energy is transformed to heat/motion, and then photon is re emitted at a lower energy. In UV fluorescence the initial wavelength is invisible and the final one is visible. Technically you can visible to visible fluorescence also, but it’s less impressive to us.
- saltcured 3y agoAnd then there is multi-photon fluorescence where several low energy photons are absorbed simultaneously to pump up the electron state and then it can emit a higher energy photon! This is used in a lot of biomedical imaging with infrared illumination yielding visible wavelengths.