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Diode-pumped mode-locked Yb3+:Y2O3 ceramic laser

A. Shirakawa, K. Takaichi, H. Yagi, J-F. Bisson, J. Lu, M. Musha, K. Ueda, T. Yanagitani, T. S. Petrov, and A. A. Kaminskii

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Abstract

A diode-pumped femtosecond ytterbium laser with a host material of Y2O3 ceramics is reported. Passive mode locking by a semiconductor saturable-absorber mirror generates 98-MHz, 615-fs pulses at a center wavelength of 1076.5 nm. The average power is 420 mW and the pulse energy is 4.3 nJ with a 2.6-W absorbed pump power. To our knowledge, this is the first continuous-wave mode-locked ceramic laser.

©2003 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Absorption coefficient (blue) and effective emission cross section (red) of 4 at.% Yb3+:Y2O3 ceramics at room temperature. Arrows indicate the pump and lasing wavelengths.

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Fig. 2.
Fig. 2. Schematic of the diode-pumped mode-locked Yb3+:Y2O3 ceramic laser. L’s, lenses for pump beam shaping: L1, f=8 mm aspherical; L2, f=-6.4 mm cylindrical; L3, f=70 mm cylindrical; L4, f=75 mm doublet. M’s, high-reflecting mirrors; OC’s, output couplers; P’s, SF10 Brewster prisms. Dashed lines indicate the beam lines in a cw operation. Oscillograms of the mode-locked pulse trains are shown in the lower right.

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Fig. 3.
Fig. 3. (a) Intensity autocorrelation trace of the mode-locked pulses. Solid curve : fit with sech2 pulse shape. (b) Spectrum of them. FWHMs are shown by arrows.

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Fig. 4.
Fig. 4. Contour plot of the output beam profile.

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