Mechanism of high-energy pulse generation without wave breaking in mode-locked fiber lasers
Mechanism of high-energy pulse generation without wave breaking in mode-locked fiber lasers
复制标题
锁模光纤激光器中无破波高能脉冲产生机制
DOI：
10.1103/physreva.82.053808
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发表时间：
2010-11
期刊：
影响因子：
--
通讯作者：
Liu, Xueming
中科院分区：
文献类型：
--
作者：
Liu, Xueming
对非线性偏振旋转锁模光纤激光器产生高能无破波脉冲的机理和内在条件进行了数值和实验研究。数值和实验结果都表明，沿光纤两个正交偏振轴方向的脉冲能量差异较大。数值模拟表明，两组分的能量之比是有限的，在8 ~ 65之间。随着脉冲持续时间和能量的增加，脉冲中心位置瞬时频率的斜率迅速减小，而脉冲边缘的斜率变化不大。瞬时频率在整个脉冲宽度内的积累在较高的脉冲能量范围内接近常数。了解无破波脉冲产生的机理和内在条件，有助于产生由光纤激光器传送的高能脉冲。
The mechanism and intrinsic conditions of high-energy wave-breaking-free pulse generation in fiber lasers mode-locked by a nonlinear polarization rotation technique are investigated numerically and experimentally. Both numerical and experimental results show that the pulses along the two orthogonal polarization axes of the fiber have a large difference in pulse energy. The numerical simulations show that the ratio of the energy of two components is limited and ranges from about 8 to about 65. The slope of the instantaneous frequency at the central position of the pulse decreases rapidly with the increase of the pulse duration and energy, whereas the slope at the pulse edge changes slightly. The accumulation of instantaneous frequency throughout the pulse width approaches a constant in a higher pulse energy regime. Understanding the mechanism and intrinsic conditions of the wave-breaking-free pulse generation could be useful in generating high-energy pulses delivered from fiber lasers.