Femtosecond enhancement cavity with kilowatt average power

Zhang Jin^{1, 2}, Hua Lin-Qiang^{1, †}, Yu Shao-Gang^{1, 2}, Chen Zhong^{1, 2}, Liu Xiao-Jun^{1, ‡}

(a) The intensity of transmission while scanning the cavity length before mode-matching optimization. (b) Same as in panel (a) but after mode-matching optimization.