Flash-lamp-pumped, room-temperature Ho:Tm:Cr:YAG and Ho:Tm:Er:YLF are compared for single but long pulse operation, with pulse lengths of approximately 1.0 μs. Under similar operating conditions in normal-mode operation, a slope efficiency of 0.0331 was observed for Ho:Tm:Er:YLF compared with 0.0047 for Ho:Tm:Cr:YAG. For <i>Q</i>-switched operation, Ho:Tm:Er:YLF yielded a slope efficiency of 0.0075. In comparison, a slope efficiency of 0.0012 was obtained for Ho:Tm:Cr:YAG. Two methods of producing long pulse lengths are compared: pulse selection of normal-mode relaxation oscillations and <i>Q</i>-switching in a long resonator. Theoretical models developed in a companion paper for normal-mode relaxation oscillations and <i>Q</i>-switching in quasi-four-level solid-state lasers are in agreement with the experimental results.
© 1997 Optical Society of America
Mahendra G. Jani, Norman P. Barnes, and Keith E. Murray, "Flash-lamp-pumped Ho:Tm:Cr:YAG and Ho:Tm:Er:YLF lasers: experimental results of a single, long pulse length comparison," Appl. Opt. 36, 3357-3362 (1997)