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摘要
A novel Tm3+ -doped crystal Lu0.8Gd0.8Y0.4SiO6 (Tm: LGYSO) was grown by the Czochralski (Cz) method. The full width half maximum (FWHM) of the Tm:LGYSO crystal around 2 lam was as broad as 280 nm, which is the broadest FWHM among the Tm3+ doped crystals have been reported, to the best of our knowledge. The crystal growth, structure, absorption spectra, J-O parameters, emission spectra and fluorescence lifetime were discussed in details. The absorption cross-section is 1.429 x 10(-20) cm(2) and the full width half maximum is 8.337 nm at 791 nm. The spectroscopic parameters were calculated using the Judd-Ofelt theory, and the J-O parameters Omega(2), Omega(4) and Omega(6) were found to be 1.615 x 10(-20), 2.773 x 10(-20) and 0.695 x 10(-20) cm(2), respectively. An intensity and broad 2 mu m emission of the F-3(4) -> H-3(6) transition in Tm: LGYSO crystal was observed with an emission cross-section of 0.73672 x 10(-20) cm(2) at 1972 nm. The fluorescence decay time of the F-3(4) -> H-3(6) transition was measured to be 1.669 ms. Results suggest that Tm: LGYSO crystal is a promising laser crystal for tunable and ultrafast laser output around the 2 mu m wavelength.
