Optical nonlinearity of Janus material TaSSe and its applications in fiber lasers

TaSSe is a novel nanomaterial that, due to its excellent physical and photonic properties, finds extensive applications in areas such as metal-reinforced composite materials, microelectronics, waveguide lasers, and high-temperature protective coatings. However, there is relatively less current research on the nonlinear optical applications of TaSSe as a saturable absorber in fiber lasers. This article employs a liquid exfoliation method to prepare TaSSe nanosheets. Stable dual-wavelength Q-switching operation is achieved at central wavelengths of 1532.02 nm and 1557.09 nm. The maximum single pulse energy of 75.07 nJ can be achieved at a pump power of 100 mW, with the corresponding repetition rate of 26.28 kHz. To the best of our knowledge, this is the first report on the nonlinear optics of TaSSe as a Q-switcher in near-infrared fiber lasers, and these experimental outcomes confirm the significant potential of TaSSe nanomaterials for nonlinear optical applications.