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Solid-state, ultraviolet, high-power laser system using a Ce: LiCAF gain medium

Nobuhiko Sarukura 1Tsuguo Fukuda 2,3

1. Institute of Laser Engineering (ILE), Yamada-oka 2-6, Suita, Osaka, Japan, Osaka 565-0871, Japan
2. Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3. Fukuda X'tal Laboratory, c/o ICR 6-6-3, Minami Yoshinari, Aoba-ku, Sendai 981-3204, Japan


High peak-power, femtosecond (fs), ultraviolet (UV) lasers have recently attracted new interest. Chirped pulse amplification (CPA) in the UV region has been previously demonstrated using Ce:LiCaAlF6 (Ce:LiCAF) crystal as the gain medium. The peak power of the amplified and compressed pulse (115 fs) reached 30 GW at 290 nm. To increase the peak power to the terrawatt (TW) level, further pulse compression is desired. Since Ce:LiCAF has a tunability of 281 nm to 315 nm, it holds promise for 3-fs pulse generation which is required for seeding TW-class Ce:LiCAF lasers. The pulse width of the frequency-tripled Ti-sapphire regenerative amplifier was measured to be 210 fs. The seed pulses were then focused unto a hollow fiber filled with argon to spectrally broaden the pulses due to self phase-modulation.The pulses were then compressed to 25 fs by dispersion-compensation. The fourth harmonics of a Nd:YAG laser (266 nm) is an ideal pump source as it falls within the absorption band of Ce:LiCAF. We have previously generated 430 mJ of fourth hamonics with a total conversion efficiency of 30.5% using Li2B4O7 (LB4) crystals. A Ce:LiCAF double-pass power amplifier was then designed with a peak energy of 98 mJ for a 13 mJ seed pulse and an extraction efficiency of 25%.


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Related papers

Presentation: Invited oral at Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth, Polish-Japanese-German Crystal Growth Meeting, by Nobuhiko Sarukura
See On-line Journal of Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth

Submitted: 2007-04-25 09:55
Revised:   2009-06-07 00:44