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Passively mode-locked Yb:KLu(WO4)2 oscillators

U. Griebner, S. Rivier, V. Petrov, M. Zorn, G. Erbert, M. Weyers, X. Mateos, M. Aguiló, J. Massons, and F. Díaz

Open Access Open Access

Abstract

We demonstrate passive mode locking based on the novel monoclinic double tungstate crystal Yb:KLu(WO4)2. We report the shortest pulses ever produced with an Yb-doped tungstate laser using a semiconductor saturable absorber. A pulse duration of 81 fs has been achieved for an average power of 70 mW at 1046 nm. We compare the performance of the polarization oriented parallel to the Nm- and Np-crystallo-optic axes. Results in the femtosecond and picosecond regime are presented applying either Ti:sapphire or diode laser pumping. The great potential of Yb:KLu(WO4)2 as an active medium for ultrashort pulses is demonstrated for the first time, to our knowledge.

©2005 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Gain cross section σ gain for polarization along the Np - and Nm -crystallo-optic axes of Yb:KLuW and different population inversion β. Note that the Ng -polarization is unfavourable because of the small cross sections.

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Fig. 2.
Fig. 2. Setup of the mode-locked Yb:KLu(WO4)2 laser: SAM - saturable absorber mirror; M1 -focusing mirror; M2, M3 - folding mirrors, P1, P2 - SF10 Brewster prisms; M4, M5 - output couplers (OC=1 to 5%), LP - f=6.28 cm focusing lens.

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Fig. 3.
Fig. 3. Autocorrelation trace and spectrum (inset) of the Yb:KLu(WO4)2 laser in the picosecond regime (Ti:sapphire laser pumping).

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Fig. 4.
Fig. 4. Autocorrelation traces and spectra (insets) of the femtosecond Yb:KLu(WO4)2 laser: (a) Nm -oriention, Ti:sapphire laser pumping; (b) Np -orientation, diode pumping.

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Fig. 5.
Fig. 5. Comparison of the femtosecond Yb:KLu(WO4)2 laser performance (average power vs. pulse duration) for polarization oriented parallel to the Np - and Nm -crystallo-optic axes.

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