Crystal growth, spectra and laser properties of Tm 3+ and Ho 3+ co-doped GdScO 3 crystal

Abstract Tm,Ho:GdScO 3 single crystal was grown by the Czochralski method. Its quality and effective segregation coefficient of crystal were characterized, and spectral properties of crystal (100) plane were studied. The absorption cross-section of Tm,Ho:GdScO 3 at 793 nm is 1.61 ×10 -20 cm 2 and emission cross-section at 2020 nm is 1.39×10 -20 cm 2 . The laser performance of the crystal by 793 nm LD end-pumped was investigated. The maximum output power of 240 mW was obtained with a slope efficiency of 9.1% in CW mode. In pulse mode, the maximum average output power of 507mW was achieved. The maximum slope efficiency of 13.7% was obtained with 100 Hz and 400µs. The laser wavelength is 2096 nm. The beam quality factors M x 2 / M y 2 were fitted to be 1.81/1.80. These results indicate that Tm,Ho:GdScO 3 crystal is a promising candidate medium for near-infrared laser crystal.