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Recently few cycle pulses with an ultrahigh peak power and a high average power have been actively developed by using a conventional Ti:sapphire system and an optical parametric chirped-pulse amplification (OPCPA) system. A powerful pump source is enthusiasmly desired in nano- and pico-seconds for Ti:sapphire and OPCPA, respectively. A "GENBU (Generation of ENergetic Beam Ultimate)"-laser...
A diode-pumped laser system in joule-class energy has been developed at 100 Hz in nano-second to pico-second. A feasibility study has shown high slope efficiency of 44% and optical efficiency of 30% at 150 mJ pulse energy.
An 1-kJ laser system ldquoGENBUrdquo has been conceptually designed by using a large-aperture active-mirror amplifier with a cryogenic Yb:YAG ceramic, as a milestone for a new IFE reactor driver. A 1-J system ldquoGENBU-Kidrdquo is under construction for power-scaling up to 1 kJ.
We have demonstrated a picosecond cryogenically-cooled Yb:YAG regenerative amplifier with diode pumping. A high pulse energy of 3.4 mJ was obtained with a 12.5-ps pulse duration at 500-Hz repetition rate.
A diode-pumped Q-switched laser oscillator with a liquid-nitrogen-cooled Yb:YAG ceramics active mirror has been demonstrated. 7.5-mJ pulse energy and 30-W average power were obtained. The maximum optical and slope efficiency were 62% and 71%, respectively.
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