laser spectroscopy ultra-fast laser spectroscopy https://orcid.org/0000-0001-5985-7429 ultrafast laser spectroscopy CHMO:0001962 2009-06-17T01:11:06Z Spectroscopy where the sample is illuminated with one or more laser beams and the absorption or emission of light by the sample is measured in the following fs–ns timescale is measured.