Chinese Optics Letters, 2019, Vol. 17, Issue 12, pp.
Enhanced nonlinear optical response of layered WSe1.4Te0.6 alloy in 1μm passively Q-switched laser
Du Zhengting, Zhang Tianqi, Xie Zhenda, Ning Jian, Lv Xinjie, Xu Jinlong, Zhu Shining
- Nanjing University
Due to the composition-dependent properties of two-dimensional (2D) transition metal dichalcogenides (TMDs), alloying of existing dissimilar TMDs architecture is a novel and controllable route to tailor crystal structure with superior optical and optoelectronic properties. Here, we reported the hexagonal-phase WSe1.4Te0.6 alloy can enable great promise for enhanced saturable absorption response exceeding the parent component WSe2 and WTe2, with larger modulation depth and lower saturable intensity. These advantages allowed the 1070 nm passively Q-switched lasers based on WSe1.4Te0.6 more efficient, with narrowing pulse duration narrowed to 45%, slope efficiency increased by 232%. Our findings highlighted the appropriate alloying of TMDs as an effective strategy for development of saturable absorbers.