title: Pump-probe micro-spectroscopy by means of an ultra-fast acousto-optics delay line.
abstract: We demonstrate femtosecond pump-probe transient absorption spectroscopy using a programmable dispersive filter as an ultra-fast delay line. Combined with fast synchronous detection, this delay line allows for recording of 6 ps decay traces at 34 kHz. With such acquisition speed, we perform single point pump-probe spectroscopy on bulk samples in 80 μs and hyperspectral pump-probe imaging over a field of view of 100 μm in less than a second. The usability of the method is illustrated in a showcase experiment to image and discriminate between two pigments in a mixture.
authors.forename: Xavier
authors.initials: X
authors.lastname: Audier
authors.forename: Naveen
authors.initials: N
authors.lastname: Balla
authors.forename: Hervé
authors.initials: H
authors.lastname: Rigneault