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

Abstract

Abstract Tm,Ho:GdScO3 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:GdScO3 at 793 nm is 1.61 ×10-20cm2 and emission cross-section at 2020 nm is 1.39×10-20cm2. 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 Mx2/My2 were fitted to be 1.81/1.80. These results indicate that Tm,Ho:GdScO3 crystal is a promising candidate medium for near-infrared laser crystal.