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Recording of transient absorption microscopy images requires fast detectionof minute optical density changes, which is typically achieved withhigh-repetition-rate laser sources and lock-in detection. Here, we present ahighly flexible and cost-efficient detection scheme based on a conventionalphotodiode and an USB oscilloscope with MHz bandwidth, that deviates from thecommonly used lock-in scheme and achieves benchmark sensitivity. Our schemecombines shot-to-shot evaluation of pump-probe and probe-only measurements, ahome-built photodetector circuit optimized for low pulse energies applyinglow-pass amplification, and a custom evaluation algorithm based on Fouriertransformation. Advantages of this approach include abilities to simultaneouslymonitor multiple frequencies, parallelization of multiple detector channels,and detection of different pulse sequences (e.g., include pump-only). With a 40kHz repetition-rate laser system powering two non-collinear optical parametricamplifiers for wide tuneability, we demonstrate the 2-D imaging performance ofour transient absorption microscope with studies on micro-crystalline molecularthin films.

Transient absorption microscopy setup with multi-ten-kilohertz shot-to-shot subtraction and discrete Fourier analysis