Optical and Spectroscopic Properties of 2 % Er and 20 % Yb Co-Doped YCa4B3O10

Abstract

Optical property of 20 % Yb and 2 % Er ion co-doped YCOB(YCa₄B₃O₁₀), self frequency doubling non-linear optical crystal, was investigated at the wavelengths of 1.0 and 1.5 μm. The absorption of 20 % Yb ion doped YCOB increased by 2 % Er ion co-doping around absorption band of 1.0 μm. The absorbed energy at 1.0 μm band relayed to Er ion and the fluorescence at 1.5 μm was observed by energy transfer. The fluorescent lifetime of 1.5 μm with temperature was also investigated. It increased form 1.27-1.54 and 1.62 ms with lowering temperature from 300-77 and 6 K, respectively. The fluorescent spectral bandwidth at 1.5 μm was sharpened with lowering temperature, however the red shift of peak wavelength was not observed with co-doping of Er ion.