Field-resolved two-dimensional spectroscopy reveals the sub-cycle gain dynamics of a free-running terahertz quantum cascade laser and disentangles resonantly enhanced nonlinearities up to eight-wave mixing in a regime where gain replaces absorption.
Book / Congress title:
International Conference on Ultrafast Phenomena (P) Technical Digest Series (Optica Publishing Group, 2022), paper Tu5A.2
Congress (additional information):
Montreal, Quebec, Canada 18-22 July 2022-07
Publisher:
Optica Publishing Group (former OSA Technical Digest (Optical Society of America)