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550 mJ Q-switched cryogenic Ho:YLF oscillator pumped with a 100 W Tm:fiber laser
Helge Fonnum1, Espen Lippert, Magnus W Haakestad
1Norwegian Defense Research Establishment, FFI, Instituttveien 20, Kjeller NO-2027, Norway. Helge.Fonnum@ffi.no
Optics Letters
|June 1, 2013
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.
