Diode-pumped solid state laser sources of picosecond UV pulses for photobiology

Eric Roisse; Frederic Louradour; Vincent Couderc; Alain Barthelemy; M. Gaignet; Francois Balembois; Patrick M. Georges; Alain Brun

doi:10.1117/12.308626

26 May 1998 Diode-pumped solid state laser sources of picosecond UV pulses for photobiology

Eric Roisse, Frederic Louradour, Vincent Couderc, Alain Barthelemy, M. Gaignet, Francois Balembois, Patrick M. Georges, Alain Brun

Author Affiliations +

Proceedings Volume 3404, ALT'97 International Conference on Laser Surface Processing; (1998) https://doi.org/10.1117/12.308626
Event: ALT '97 International Conference on Laser Surface Processing, 1997, Limoges, France

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.

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Eric Roisse, Frederic Louradour, Vincent Couderc, Alain Barthelemy, M. Gaignet, Francois Balembois, Patrick M. Georges, and Alain Brun "Diode-pumped solid state laser sources of picosecond UV pulses for photobiology", Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); https://doi.org/10.1117/12.308626

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