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https://resolver.caltech.edu/CaltechTHESIS:10162020-115452109

… Ti:sapphire laser (wavelength: 800 nm, repetition rate: 1 kHz, pulse-width: 25 fs, Astrella, Coherent inc.) was used as a pump seed laser. The pump was then optical parametric amplified to be converted to 532 nm (power incident on the sample: 5 𝜇J). A CW laser was chosen as prob…