Er 3+ /Yb 3+ :Sr 3 Y(BO 3 ) 3 crystal with dimension of f20 Â 30 mm 3 has been grown by the Czochralski method. The absorption band at 980 nm has an absorption coefficient 11.7 cm À1 and FWHM of 11 nm. The emission band at 1450-1650 nm corresponding to 4 I 13/2 -4 I 15/2 transition of Er 3+ was observed under 977 nm exciting. The fluorescence lifetime of the upper 4 I 13/2 level of Er 3+ in Er 3+ /Yb 3+ :Sr 3 Y(BO 3 ) 3 crystal was 700 ms at 300 K. r
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