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Diode-pumped mode-locked Yb3+:Lu2O3 ceramic laser

M. Tokurakawa, K. Takaichi, A. Shirakawa, K. Ueda, H. Yagi, S. Hosokawa, T. Yanagitani, and A. A. Kaminskii

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Abstract

We report a diode-pumped passively mode-locked Yb3+:Lu2O3 ceramic laser by use of a semiconductor saturable absorber mirror. Almost transform-limited 357 fs pulses at the center wavelength of 1033.5 nm with a maximum average power of 352 mW are obtained. The efficiency against the absorbed pump power is as high as 32% by use of a laser-diode pumping and the repetition rate is 97 MHz. This is the first demonstration of a diode-pumped mode-locked Yb3+:Lu2O3 ceramic laser to our knowledge.

©2006 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Absorption and emission spectra (2F7/2↔2F5/2) of Yb3+:Lu2O3 ceramic. The absorption and emission spectra were measured with 1 at.%, 1 mm and 0.3 at.%, 1mm ceramics respectively. Arrows indicate the pump and lasing wavelengths in this experiment.

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Fig. 2.
Fig. 2. Experimental setup of the diode-pumped mode-locked Yb3+:Lu2O3 ceramic laser.

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Fig. 3.
Fig. 3. Output power versus launched pump power. The cw operation at 1078 nm in multimode (circles), TEM00 mode at 1034.5 nm (squares) and mode-locked operation at 1033.5 nm (triangles) are shown. The curves are for eye guides.

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Fig. 4.
Fig. 4. (a) Autocorrelation trace and spectrum (inset) of the shortest pulses at a 3.05 W launched pump power. The experimental data (points) and a sech2-fitting curve (solid curve) are shown. (b) Autocorrelation trace in a multi-pulse operation at a launched pump power of 4.2 W.

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