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Ultra-short-pulsed and highly-efficient diode-pumped Yb:SYS mode-locked oscillators

Frédéric Druon, François Balembois, and Patrick Georges

Open Access Open Access

Abstract

We report the shortest pulses ever produced with an Yb3+:SrY4(SiO4)3O {Yb:SYS} laser. 70 fs has been demonstrated for an average power of 156 mW at 1066 nm. Moreover, tunability in the 100-fs range has been obtained between 1055 nm and 1072 nm. Finally, an average power of 420 mW has been obtained at 1068 nm with 110-fs pulses.

©2004 Optical Society of America

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Figures (9)
Fig. 1.
Fig. 1. Performances (average power vs. pulse duration) for mode-locked lasers based on Yb-doped crystals [5–13,16] (N.B. The modelocking process use SESAM if not mentioned).

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Fig. 2.
Fig. 2. Absorption and emission spectra of the Yb:SYS along the σ and π axes.

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Fig. 3.
Fig. 3. Gain cross section (σg ) along the π (left figure) and σ (right figure) axes for different values of population inversion rate β. σg is given by σg = βσe - (1-β)a where σe and σa are the emission and absorption cross sections.

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Fig. 4.
Fig. 4. Experimental setup.

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Fig. 5.
Fig. 5. Autocorrelation trace of 70-fs pulses.

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Fig. 6.
Fig. 6. Spectra of 70-fs pulses at 1066 nm and 75-fs pulses at 1063.5 nm. The gain cross section for β=8% is also represented (in arbitrary units).

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Fig 7.
Fig 7. Tunability of the femtosecond oscillator: the laser average power and the pulse duration are plotted versus the central wavelength.

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Fig. 8.
Fig. 8. Spectra presenting the tunability in the 100-fs range from 1055 to 1072.5 nm. The gain cross section for β = 8% is also represented (in arbitrary units).

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Fig. 9.
Fig. 9. Spectra representing the tunability in the 110-fs range from 1065.5 to 1071 nm. The gain cross section for β = 8% is also represented (in arbitrary units).

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