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Proceedings Paper

Diode-pumped solid state laser sources of picosecond UV pulses for photobiology
Author(s): Eric Roisse; Frederic Louradour; Vincent Couderc; Alain Barthelemy; M. Gaignet; Francois Balembois; Patrick M. Georges; Alain Brun
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Paper Abstract

We realized three different configurations for the production of picoseconds pulses in the UV by a diode-pumped solid-state laser. The first one is based on a diode-pumped Cr:LiSAF oscillator delivering tunable picosecond pulses in the near infrared. A Ti:Sapphire regenerative amplifier increased IR pulses energy up to 4.5 (mu) J. After doubling and tripling in two LBO crystals, we obtained pulses with an energy up to 0.14 (mu) J tunable between 273 and 286 nm. In the second scheme, based on a modelocked Nd:YAG laser, the SHG (KTP) and SFG (LBO) crystals are both inserted inside the cavity. The laser operated in a Q-switched mode-locked regime and produced 1.2 mW of UV average power in pulse of 60 picoseconds duration and 4 W peak power. In the last architecture, we used a resonant enhancement with a ring- cavity. We obtained 54% conversion efficiency in the green for picoseconds pulses at 1064 nm at 100 MHz rep. rate. A special arrangement was implemented for compensation of the birefringence and walk-off of the KTP crystal in the resonant cavity. Conversion to UV in the same cavity is in progress.

Paper Details

Date Published: 26 May 1998
PDF: 11 pages
Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); doi: 10.1117/12.308626
Show Author Affiliations
Eric Roisse, Univ. de Limoges (France)
Frederic Louradour, Univ. de Limoges (France)
Vincent Couderc, Univ. de Limoges (France)
Alain Barthelemy, Univ. de Limoges (France)
M. Gaignet, Institut d'Optique Theorique et Appliquee/CNRS (France)
Francois Balembois, Institut d'Optique Theorique et Appliquee/CNRS (France)
Patrick M. Georges, Institut d'Optique Theorique et Appliquee/CNRS (France)
Alain Brun, Institut d'Optique Theorique et Appliquee/CNRS (France)


Published in SPIE Proceedings Vol. 3404:
ALT'97 International Conference on Laser Surface Processing
Vladimir I. Pustovoy, Editor(s)

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