Abstract
In this paper, highly Yb-doped Ca 4GdO(BO 3) 3 (Yb : GdCOB) crystals were grown by the Czochralski method. The absorption and fluorescence spectra were measured. The laser of Yb : GdCOB crystal was demonstrated with different output mirrors when it was pumped by a fiber-coupled laser diode (LD) at the wavelength of 976.4 nm. The lowest pumping threshold was 280 mW, the highest light–light conversion efficiency was 33.8%, and the highest slope efficiency up to 70% was thus calculated from the linear part of the curve. The self-frequency doubling (SFD) green laser output was also observed.
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