Ultrafast nonlinear optics of Niobium selenide nanosheets.

In this work, the nonlinear optical response and the ultrafast carrier dynamics in the visible region of NbSe2 are investigated. The transient absorption (TA) spectra reveal the relaxation process, including electron–phonon scattering and phonon–phonon scattering. These results contribute to an in-depth understanding of the light-matter interactions and carrier dynamics in NbSe2 and will establish a foundation for its applications in nonlinear photonic and optoelectronic devices. [ABSTRACT FROM AUTHOR]