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The 4-at.％ Tm∶Sc2SiO5 (Tm∶SSO) crystal is successfully obtained by the Czochralski method.The optical properties and thermal conductivity of the crystal are investigated.The broad continuous wave (CW) laser output of (100)-cut Tm∶SSO with the dimensions of 3 mm × 3 mm × 3 mm under laser diode (LD)-pumping is realized.The full width at half maximum (FWHM) of the laser emitting reaches up to 21 nm.The laser threshold of Tm∶SSO is measured to be 0.43 W.Efficient diode-pumped CW laser performance of Tm∶SSO is demonstrated with a slope efficiency of 25.9％ and maximum output power of 934 mW.