title: 550 mJ Q-switched cryogenic Ho:YLF oscillator pumped with a 100 W Tm:fiber laser.
abstract: We report 550 mJ pulses with 14 ns FWHM duration at 1 Hz repetition rate from a Q-switched cryogenic Ho:YLF oscillator pumped with 100 W in 35 ms by a Tm:fiber laser. The laser has a confocal unstable resonator with a graded-reflectance output coupler, resulting in a beam quality of M(2) = 1.5. Pulse energies of 416 and 343 mJ were obtained at 10 and 20 Hz repetition rate, respectively.
authors.affiliation: Norwegian Defense Research Establishment, FFI, Instituttveien 20, Kjeller NO-2027, Norway. Helge.Fonnum@ffi.no
authors.forename: Helge
authors.initials: H
authors.lastname: Fonnum
authors.forename: Espen
authors.initials: E
authors.lastname: Lippert
authors.forename: Magnus W
authors.initials: MW
authors.lastname: Haakestad