Abstract

The thermo-opto-mechanical strength of Yb:YAG gain media has enabled average power scaling of solid state lasers to the kilowatt regime in continuous-wave (cw) and short-pulse regimes. Moreover, at cryogenic temperatures Yb:YAG becomes a high-gain four-level laser, exhibiting a much lower thermal lens [1]. However, this comes at the expense of reduced gain bandwidth limiting pulsewidths to the few-picosecond regime. As an alternative Yb:YLF gain media possess broader emission bands centered around 995 nm and 1020 nm, that potentially enable generation/amplification of sub-ps long pulses even at cryogenic temperatures [2]. In cw operation, output powers above 220 W and a slope efficiency approaching 70% has been realized from a cryogenically cooled Yb:YLF system [3]. A similar efficiency has also been realized from a Q-switched cryogenic Yb:YLF laser delivering 60-ns pulses around 995 nm at 10 kHz repetition rate and an average power of 50 W (efficiencies up to 82% has been demonstrated in cw regime) [4]. Via regenerative amplification, sub-picosecond 1 mJ pulses at 10 kHz [1], 30 mJ pulses at 20 Hz [5], and 107 mJ pulses at 10 Hz has been extracted from cryogenic Yb:YLF systems operating around 1020 nm.

© 2019 IEEE

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription