Ultrafast nonlinear optics of Niobium selenide nanosheets

In this work, the nonlinear optical response and the ultrafast carrier dynamics in the visible region of NbSe 2 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 NbSe 2 and will establish a foundation for its applications in nonlinear photonic and optoelectronic devices.