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Lasers femtoseconde Yb3+: BOYS et Yb3+: SYS

Pierre Raybaut 1 
1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : This work deals with diode-pumped solid-state femtosecond lasers, based on new ytterbium-doped crystals, emitting around 1.06 µm. We study especially two recently discovered crystals: Yb3+: BOYS (or Yb3+: Sr3Y(BO3)3) and Yb3+: SYS (or Yb3+: SrY4(SiO4)3O) which crystallographic, physic and spectroscopic properties are well adapted to short-pulse generation and amplification (with duration typically from 10-14 to 10-12 s). To begin with, we developed two femtosecond oscillators based on Yb3+: BOYS and Yb3+: SYS, which produced 69-fs and 94-fs pulses, respectively, with an energy around 1 nJ and at a repetition rate of approximately 100 MHz. The oscillators' cavities were mode-locked in very stable regimes, and were self-started and stabilized by a semi-conductor saturable absorber mirror. Afterwards, in order to increase the energy of these pulses, we developed a regenerative amplifier based on Yb3+: SYS. This amplifier produced 380-fs pulses, with an energy of 70 µJ, at a repetition rate of 1 kHz. Finally, we used an acousto-optic programmable filter as a pulse shaper to increase the amplified pulses spectral bandwidth. These experimentations allowed us to validate a theoretical model that led to realistic numerical simulations of the Yb3+: SYS regenerative amplifier, and to improve the performances of the whole Yb3+: SYS femtosecond laser, so that pulses with less than 300-fs duration should be produced.
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Contributor : Pierre Raybaut Connect in order to contact the contributor
Submitted on : Wednesday, May 26, 2004 - 11:51:53 AM
Last modification on : Saturday, June 25, 2022 - 11:14:18 AM
Long-term archiving on: : Thursday, September 23, 2010 - 2:58:02 PM