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A number of good quality thulium and holmium-codoped LuLiF4 and YLiF4 single crystals were successfully grown by the Czochralski crystal growth method under a CF4 atmosphere. Using a novel diode-pumped, quasi-end-pump scheme incorporating two lens ducts, pulsed laser action is achieved in 5%Tm, 0.5% Ho:LuLiF4 and 5%Tm, 0.5% Ho:YLiF4 crystals, at various pulse repetition frequencies and temperatures. At 10 Hz and at an operating temperature of 273 K, slope efficiencies (optical to optical efficiencies) with respect to the incident pump energies of 12.9% (9.2%) and 7.4% (5.2%) were demonstrated in the grown Tm, Ho:LuLiF4 and Tm, Ho:YLiF4 crystals, respectively. Free running laser output energies in excess of 30 mJ (LuLiF4) and 17 mJ (YLF) were measured.