The Carrier Dynamics of PtTe₂ Nanoplates and Their Application in ~2 μm Pulsed Laser

Pulse lasers operating in the ~2 μm are gaining significant application in environmental atmosphere monitoring and optical communication. In the conducted study, high-quality, multilayer PtTe2 nanoplates were effectively synthesized through the mechanical exfoliation method. Additionally, the carrier dynamics process of PtTe2 nanoplates was characterized, and the results indicate an ultrafast saturation recovery time (~10 ps), which renders it an optimal choice for generating ~2 μm pulse lasers. By utilizing PtTe2 nanoplates as saturable absorbers (SA), experimentation yielded a minimum pulse width of 608 ns, alongside an average output power of 1.7 W. This corresponds to a maximum single pulse energy of 17.9 μJ and a peak pulse power of 29.7 W. Our findings suggest that PtTe2 could serve as a potential SA in pulse lasers for the ~2 μm.