Zhang Xintong, Guo Haozhe, He Wenbin, Wang Xiaocong, Huang Qi, Zheng Yu, Yin Ruochen, Huang Zhiyuan, Jiang Xin, Xu Lixin, Leng Yuxin, Pang Meng
Opt Lett. 2024 Feb 1;49(3):674-677. doi: 10.1364/OL.509981.
We demonstrate that through inserting a short length of highly birefringent small-core photonic crystal fiber (Hi-Bi SC-PCF) into a soliton fiber laser, the nonlinear polarization rotation effect in this laser can be manipulated, leading to continuous tuning of the output pulse parameters. In experiments, we observed that by adjusting the polarization state of light launched into the Hi-Bi SC-PCF and varying the cavity attenuation, the laser spectral width can be continuously tuned from ∼7.1 to ∼1.7 nm, corresponding to a pulse-width-tuning range from ∼350 fs to ∼1.56 ps. During the parameter tuning, the output pulses strictly follow the soliton area theory, giving an almost constant time-bandwidth-product of ∼0.31. This soliton fiber laser, being capable of continuous parameter tuning, could be applied as the seed source in ultrafast laser systems and may find some applications in nonlinear-optics and soliton-dynamics experiments.
我们证明，通过将一小段高双折射小芯光子晶体光纤（Hi-Bi SC-PCF）插入孤子光纤激光器中，可以操控该激光器中的非线性偏振旋转效应，从而实现输出脉冲参数的连续调谐。在实验中，我们观察到，通过调整注入到Hi-Bi SC-PCF中的光的偏振态并改变腔损耗，激光光谱宽度可以从约7.1 nm连续调谐到约1.7 nm，对应的脉宽调谐范围从约350 fs到约1.56 ps。在参数调谐过程中，输出脉冲严格遵循孤子面积理论，时间带宽积几乎恒定，约为0.31。这种能够连续进行参数调谐的孤子光纤激光器可作为超快激光系统的种子源，并可能在非线性光学和孤子动力学实验中得到一些应用。
