Tunable Nd, La:SrF<sub>2</sub> laser and passively Q-switched operation based on gold nanobipyramids saturable absorber

Tunable Nd, La:SrF₂ laser and passively Q-switched operation based on gold nanobipyramids saturable absorber

Zhang Feng^{1, 2}, Zhang Hua-Nian^{1, 2}, Liu Dan-Hua^{1, †}, Liu Jie^{1, 2, ‡}, Ma Feng-Kai³, Jiang Da-Peng³, Pang Si-Yuan³, Su Liang-Bi³, Xu Jun⁴

(color online) (a) Gold nanobipyramid solution. (b) TEM images of the gold nanobipyramid film. (c) Absorption coefficient versus wavelength. (d) Nonlinear absorption of the gold nanobipyramid film.