Spectral properties of Er3+-doped CaGdAlO4 crystal for laser application around 1.55μm

•Detailed spectral properties of the Er:CaGdAlO4 crystal have been investigated.•Multi-phonon relaxation rate of Er3+ ions in the Er:CaGdAlO4 crystal is estimated.•The quantum efficiency of the 4I13/2 level in the Er:CaGdAlO4 crystal is near 100%. Room-temperature polarized spectral properties of th...

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Bibliographic Details
Published in:Journal of alloys and compounds 2014-02, Vol.585, p.163-167
Main Authors: Huang, J.H., Gong, X.H., Chen, Y.J., Lin, Y.F, Luo, Z.D., Huang, Y.D.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross sections
Crystals
Er:CaGdAlO4 crystal
Exact sciences and technology
Gain
Laser applications
Lasers
Mathematical analysis
Optical materials
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
Spectra
Spontaneous emission
Stimulated emission
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Summary:•Detailed spectral properties of the Er:CaGdAlO4 crystal have been investigated.•Multi-phonon relaxation rate of Er3+ ions in the Er:CaGdAlO4 crystal is estimated.•The quantum efficiency of the 4I13/2 level in the Er:CaGdAlO4 crystal is near 100%. Room-temperature polarized spectral properties of the Er:CaGdAlO4 crystal are reported. The Judd–Ofelt theory was applied to analyze the polarized absorption spectra and then calculate the spontaneous emission probabilities, radiative lifetimes, and branch ratios. Room-temperature fluorescence lifetimes of the 4I13/2, 4I11/2, 4F9/2, and 4S3/2 multiplets for Er3+ ions were measured. Stimulated emission cross-sections of the 4I13/2→4I15/2 transition obtained by the Fuchtbauer–Ladenberg formula and the reciprocity method were compared. The results show that the Er:CaGdAlO4 crystal may be a potential gain medium for a low-threshold 1.55μm laser.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.09.032