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设计了一种采用半导体可饱和吸收镜(SESAM)实现被动锁模的激光器,该激光器中只有单根的全固型掺镱光子带隙光纤(AS-Yb-PBGF)。在1μm波段,该光纤具有负的群速度色散(GVD),因此腔内激光增益和负的GVD同时由该光纤提供。激光腔内非线性效应与仅由AS-Yb-PBGF提供的负GVD平衡作用可使激光器实现孤子运转。用分步傅里叶方法数值模拟了其孤子运转的动力学过程,该系统中初始的噪声信号经过数百次循环就可以得到稳定的孤子运转。输出脉冲能量为135 pJ,脉冲宽度为125 fs,时间带宽乘积为0.33,接近傅里叶变换极限的脉冲,脉冲重复频率可达500 MHz。系统地研究了整个激光器中孤子脉冲演变的动力学过程。
A passive mode-locked laser using a SESAM was designed. The laser had only a single, solid Ytterbium doped PBG (AS-Yb-PBGF). The fiber has a negative Group Velocity Dispersion (GVD) at the 1 [mu] m band, so both the in-cavity laser gain and the negative GVD are provided by the fiber at the same time. Laser intracavity nonlinear effects and the negative GVD provided by AS-Yb-PBGF only balance the laser for soliton operation. The kinetic process of soliton operation is numerically simulated by a step-by-step Fourier method. The initial noise signal of the system can get stable soliton operation after hundreds of cycles. The output pulse energy is 135 pJ, the pulse width is 125 fs, and the product of the time bandwidth is 0.33. The pulse near the Fourier transform limit has a pulse repetition frequency up to 500 MHz. The dynamics of soliton pulse evolution in the whole laser system are systematically studied.