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Second-harmonic generation in doped YCOB

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Recently, second-harmonic generation (SHG) has been measured in two oxoborate crystals of YCOB and GdCOB. This study extends the development of the oxoborate crystal for nonlinear frequency conversion by investigating the effects of dopant ions on the crystalline structure and, as a consequence, improving the optical nonlinearity. Nonlinear harmonic generation has been measured in a wide range of oxoborate crystals that include YCOB [YCa4(BO3)3O], Nd:YCOB, and Yb:YCOB. Conversion efficiencies approaching 40% were measured with 20% Yb-doped YCOB for a pump power of approx. 11 MW.

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