Spectroscopic and laser properties of SrMoO 4 :Tm 3+ crystal under 1700-nm laser diode pumping

Abstract Spectroscopic and laser properties of Tm 3+ ions under 1700 nm excitation in SrMoO 4 crystal are investigated. Negligible effect of cross-relaxation process ( 3 H 4 3 F 4 , 3 H 6 3 F 4 ) on population of 3 F 4 level for thulium concentrations up to 0.25 at.% was demonstrated. Efficient lasing with slope efficiency up to 18% and broadband (over 100 nm) tuning at room temperature under 1700 nm diode pumping were obtained.