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本文首次报道了连续波Ti：Sapphire纵向泵浦主动锁模Yb：S－FAP激光器．实验得到的最短锁模脉宽为35．4ps，通过特殊设计的定态激发光谱实验，我们对它的锁模特性进行了研究，因为从理论上说Yb:S－FAP4nm的荧光线宽应能得到更短的变换极限脉宽．实验结果首次证实了在Yb:S-FAP中存在着多激活中心效应．本文还首次发现了一种新的受激态吸收（ESA）的机制并提出了相应的理论模型．
This paper reports the continuous wave Ti: Sapphire longitudinal pump active mode-locked Yb: S-FAP laser for the first time. The shortest mode-locked pulse width was 35.4ps. Through the specially designed experiment of stationary excitation spectrum, we studied its mode-locking properties. Theoretically, the fluorescence linewidth of Yb: S-FAP4nm should be Get shorter transform limit pulse width. The experimental results for the first time confirmed the existence of a multi-activation center effect in Yb: S-FAP. This paper also found for the first time a new mechanism of excited state absorption (ESA) and put forward the corresponding theoretical model.