About the Cover
On the top: Schematic diagram of the high-power Kerr-lens mode-locked Yb:CYA laser by introducing an extra Kerr-medium to separate the gain material and Kerr material. On the bottom: (a) Continuous wave and mode-locked spectra with an inset of the beam profile at the maximum average power of 1.5 W. (b) Measured (black dash) and fitted (red) intensity autocorrelation trace.