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Passively mode-locked Yb:Lu2O3 laser

U. Griebner, V. Petrov, K. Petermann, and V. Peters

Open Access Open Access

Abstract

Given its specific thermal characteristics, the sesquioxide crystal Lu2O3 is a particularly promising laser host material. We demonstrate mode locking of a Yb:Lu2O3 laser by use of a semiconductor saturable-absorber mirror. The laser emits up to 470 mW in the picosecond regime, corresponding to a pump efficiency as high as 32%. With dispersion compensation, pulses as short as 220 fs at an average power of 266 mW are obtained at 1033.5 nm. To our knowledge, this is the first demonstration of a femtosecond oscillator based on Yb:Lu2O3.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Absorption σabs and emission cross section σem of Yb:Lu2O3 and energy-level diagram with the relevant transitions (inset). The points indicate the pump- and laser transitions.

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Fig. 2.
Fig. 2. Setup of the mode-locked Yb: Lu2O3 laser: SAM - saturable absorber mirror; M1 - focusing mirror (ROC=10 to 15 cm); M2, M3 - folding mirrors (ROC=10 cm), P1, P2 - SF6 prisms; M4, M5 - output couplers (T=1 to 5%).

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Fig. 3.
Fig. 3. Autocorrelation trace and spectrum (inset) in the picosecond (a) and in the femtosecond regime (b).

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Fig. 4.
Fig. 4. Output power versus absorbed pump power of the femtosecond Yb:Lu2O3 laser and below the mode-locking threshold (cw – continuous wave).

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Tables (1)

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Table 1. Thermal conductivity in W/m/K of different sesquioxide crystals in comparison to YAG with and without Yb-doping. Values in [] are estimated.

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