title: Rapid and economical data acquisition in ultrafast frequency-resolved spectroscopy using choppers and a microcontroller.
abstract: Spectrometers and cameras are used in ultrafast spectroscopy to achieve high resolution in both time and frequency domains. Frequency-resolved signals from the camera pixels cannot be processed by common lock-in amplifiers, which have only a limited number of input channels. Here we demonstrate a rapid and economical method that achieves the function of a lock-in amplifier using mechanical choppers and a programmable microcontroller. We demonstrate the method's effectiveness by performing a frequency-resolved pump-probe measurement on the dye Nile Blue in solution.
authors: Liang
authors: L
authors: Guo
authors: Daniele M
authors: DM
authors: Monahan
authors: Graham
authors: G
authors: Fleming