The spectroscopy investigation of ZnWO4:Tm3+ single crystal

The single crystal ZnWO4:Tm3+ has been grown by Czochralski method. The XRD, refractive index, absorption and fluorescence spectra are measured. The Judd-Ofelt parameters Omega(2), Omega(4), Omega(6) are obtained to be 6.3 x 10 (20), 1.3 x 10 (20), 1.4 x 10 (20) cm(2), respectively. The fluorescence decay time of the H-3(4) level is measured to be 0.113 ms and the quantum efficiency is 57%. The gain cross sections corresponding to F-3(4) -> H-3(6) transition at similar to 2 mu m are estimated by the reciprocity method (RM). The strong gain at similar to 2 mu m indicates that the ZnWO4:Tm3+ crystal is a promising laser host for similar to 2 mu m laser. (C) 2012 Elsevier B.V. All rights reserved.