A pump-probe LFP system is adapted to a substantially lower energy requirement of a pump light source and a probe light source. The LFP system includes a photonic crystal fiber based probe light source, a pump light source adapted to produce light pulses with nanojoule or higher energy, a main laser source to generate a first beam portion to the probe light source and a second beam portion to the pump light source, a delay generator, computer, an optical modulator, and a detector. One or more lenses can be used to focus the light beams to areas less than about 1 micron on a sample, where the sample can be rastered to provide domain specific flash photolysis data of the sample.
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