Kerr-lens mode-locked polycrystalline Cr:ZnS femtosecond laser pumped by a monolithic Er:YAG laser

Hu Chengfeng¹, Zhu Jiangfeng^{1, †}, Wang Zhaohua², Sun Xintong¹, Wei Long¹, Ling Weijun³, Dong Zhong³, Wang Qing⁴, Gao Chunqing⁴, Wei Zhiyi^{1, 2, ‡}

(color online) Experimental setup of the Kerr-lens mode-locked Cr:ZnS laser. HR, high reflection mirror; HWP, half-wave plate; M₁, M₂, concave mirrors; OC, output coupler.