Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7839823 | Journal of Luminescence | 2018 | 17 Pages |
Abstract
Tm3+:Na2La4(WO4)7, a disordered tetragonal scheelite-type tungstate crystal, is grown by the Czochralski method. The polarized absorption, stimulated-emission and gain cross-section spectra are determined. The maximum ÏSE is 1.62â¯Ãâ¯10-20 cm2 at 1788.6â¯nm for Ï-polarization. The Judd-Ofelt parameters for Tm3+ are Ω2 =â¯10.321, Ω4 =â¯0.183 and Ω6 =â¯2.122 [10-20 cm2]. The radiative lifetime of the 3F4 state is 1.63â¯ms. Raman spectroscopy reveals a maximum phonon energy of 923â¯cmâ1. Laser operation under diode-pumping is achieved with both a-cut and c-cut Tm:Na2La4(WO4)7 crystals, reaching a maximum output power for the a-cut of 715â¯mW at ~ 1937â¯nm with a slope efficiency of 34%. Microchip laser operation using the c-cut crystal yields a slope efficiency of 41%. The Tm:Na2La4(WO4)7 crystal is promising for mode-locked lasers due to its broadband emission.
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Authors
Lizhen Zhang, Shijia Sun, Zhoubin Lin, Haifeng Lin, Ge Zhang, Xavier Mateos, Josep Maria Serres, Magdalena Aguiló, Francesc DÃaz, Pavel Loiko, Yicheng Wang, Uwe Griebner, Valentin Petrov, Elena Vilejshikova, Weidong Chen,