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1ps passively mode-locked laser operation of Na,Yb:CaF2 crystal

Juan Du, Xiaoyan Liang, Yonggang Wang, Liangbi Su, Weiwei Feng, Enwen Dai, Zhizhan Xu, and Jun Xu

Open Access Open Access

Abstract

Diode-pumped passively mode-locked laser operation of Yb3+,Na+:CaF2 single crystal has been demonstrated for the first time. By using a SESAM (semiconductor saturable mirror), simultaneous transform-limited 1-ps passively mode-locked pulses, with the repetition rate of 183MHz, were obtained under the self-Q-switched envelope induced by the laser medium. The average output power of 360mW was attained at 1047nm for 3.34W of absorbed power at 976nm, and the corresponding pulse peak power arrived at 27kW, indicating the promising application of Yb3+,Na+-codoped CaF2 crystals in achieving ultra-short pulses and high pulse peak power.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Dependence of the average output power on the absorbed pump power in self-Q-switched and mode-locked operation, respectively. The inset is a single self-Q-switched pulse at output power of 400mW.

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Fig. 2.
Fig. 2. Configuration of passively mode-locked operation with a SESAM device.

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Fig. 3.
Fig. 3. (a) Self-Q-switched pulse train of a mode-locked Yb3+, Na+:CaF2 laser, (b) a single self-Q-switched pulse sampling from the train and (c) a pulse train of mode-locked pulses under the self-Q-switched envelope.

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Fig. 4.
Fig. 4. Autocorrelation of 1-ps pulses at 300mW output power is shown in the left inset. The dots indicate the experiment data and the solid line indicates the Gaussian fit data. The right inset shows the corresponding optical spectrum.

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