2D Semi‐Metallic Hafnium Ditelluride: A Novel Nonlinear Optical Material for Ultrafast and Ultranarrow Photonics Applications (Small Methods 2/2024)

Front Cover In article number 2300239, Wen, Tsang, and co-workers demonstrate the potential application of 2D-HfTe2 nanosheets in nonlinear optics and ultrafast photonics. By utilizing side-polished fiber-based HfTe2-saturable absorbers, a mode-locked laser with a pulsed width of 724 fs is realized at the second-lowest mode-locking threshold pump power, and a highly stable single-frequency fiber laser with ultranarrow linewidth is designed.