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Li2Gd4(MoO4)7 crystal preparation and spectral properties applying to 2.0 μm lasers


A Tm3+/Ho3+ co-doped Li2Gd4(MoO4)7 (Tm/Ho:LGMO) crystal was grown using the Czochralski method. A systematic investigation of the structure characteristics, polarized absorption spectra, fluorescence spectra and lifetime, emission and gain cross-sections of this crystal was reported for the first time. The main spectroscopic parameters of Ho3+ ions in the grown crystal, such as J-O intensity parameters, line and oscillator strengths, spontaneous transition rates, fluorescence branching ratios and radiative lifetimes, were calculated using the Judd-Ofelt theory. Due to the statistical distributions of Li+, Gd3+ and vacancies, the absorption and emission spectra are strongly inhomogeneously broadened. The wide absorption bands at around 795 nm are quite desirable for the efficient pumping of AlGaAs laser diodes whose emission wavelengths usually change with the operating temperature. The broad emission bands from 1600 to 2200 nm allow a wide tunability of laser oscillation. All the results reveal that Tm/Ho:LGMO crystal is a promising gain medium for tunable and ultrafast pulse lasers at 2.0 μm.

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Publication details

The article was received on 19 Jul 2018, accepted on 04 Sep 2018 and first published on 07 Sep 2018

Article type: Paper
DOI: 10.1039/C8CE01192C
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Li2Gd4(MoO4)7 crystal preparation and spectral properties applying to 2.0 μm lasers

    S. Sun, W. Qi, W. Chen, F. Lou, D. Zhong, C. Hu, L. Zhang, Z. Lin and B. Teng, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01192C

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