Tunable second harmonic generation from a Kerr-lens mode-locked Yb:YCa4O(BO3)3 femtosecond laser
Gao Zi-Ye1, 2, 5, Zhu Jiang-Feng2, Wu Zheng-Mao1, 5, †, Wei Zhi-Yi3, ‡, Yu Hao-Hai4, Zhang Huai-Jin4, Wang Ji-Yang4
       

(color online) (a) Autocorrelation trace of the KLM pulses (black dotted curve) with a sech2 fitting (red solid curve). (b) The corresponding spectrum.