3. Fs fluorescence Up-conversion Spectrometer

Technique 

Frequency mixing of fluorescence excited by a laser pulse with another laser pulse (gate) in a nonlinear crystal generates sum frequency radiation. This occurs only during the presence of the gate pulse. Therefore the time resolution is within the laser pulse width.

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Units

 2 independent laser systems for excitation and 1 for gate, 2 detection schemes

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Instrument type

Homemade

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Complexity level

High

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Applications

The instrument is able to monitor time-dependent population of fluorescent electronic excited states by recording fluorescence decay traces and emission spectra. Excited state processes as fast as 90 fs up to 400 ps can be detected over an emission range that spreads from 350 to 1200 nm.