title: Self-frequency-doubled vibronic yellow Yb:YCOB laser at the wavelength of 570  nm.
abstract: A watt-level self-frequency-doubled yellow laser at the 570 nm wavelength was realized by taking advantage of the vibronic emission of a Yb3+ doped calcium yttrium oxoborate (Yb:YCOB) crystal cut along the optimized direction out of the principal planes with the maximum effective nonlinear coefficient. Fluorescence spectroscopic properties of Yb:YCOB were studied, which showed that it had broad and anisotropic vibronic emission with a small peak at ∼1130  nm. By suppressing the electronic emission, the polarized vibronic Yb:YCOB radiation was realized with the fundamental wavelength shifting from 1130 nm to 1140 nm. By employing the self-frequency-doubling behavior of Yb:YCOB, the self-frequency-doubled yellow laser was achieved with a maximum output power of 1.08 W at 570 nm. This work provides an unprecedented and efficient way to generate yellow lasers with a compact microchip structure that may have promising applications in some regimes including medicine, entertainment, and scientific research.
authors.forename: Qiannan
authors.initials: Q
authors.lastname: Fang
authors.forename: Dazhi
authors.initials: D
authors.lastname: Lu
authors.forename: Haohai
authors.initials: H
authors.lastname: Yu
authors.forename: Huaijin
authors.initials: H
authors.lastname: Zhang
authors.forename: Jiyang
authors.initials: J
authors.lastname: Wang