Optical spectroscopy of Er:YSGG laser crystal

Er:YSGG single crystals with good optical quality were grown by Czochralski method. X-ray diffraction (XRD) measurements show that the crystal lattice parameters of the 30 at.% Er(3+)-doped YSGG crystal were a=b=c=12.4640 +/- 0.0065 angstrom, alpha=beta=gamma=90 degrees. The doping concentration of Er(3+) in YSGG was calculated. The absorption spectrum and photoluminescence spectra of Er:YSGG crystal were studied at room temperature. Based on Judd-Ofelt (J-O) theory, the J-O intensity parameters Omega(t) (t=2, 4, 6), the experimental and theoretical oscillator strengths were calculated using the absorption spectrum. The intensity parameters Omega(t) (t=2,4,6) obtained to be Omega(2)=0.23 x 10(-20) cm(2), Omega(4)=0.86 x 10(-20) cm(2), Omega(6)=0.37 x 10(-20) cm(2), respectively. With these intensity parameters, the line strengths, oscillator strengths, transition probabilities, fluorescence branching ratios and radiation lifetimes were calculated. The photoluminescence spectra and excitation spectrum of Er:YSGG were measured and studied. (C) 2010 Elsevier B.V. All rights reserved.