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研究了耗散孤子的放大和非线性展宽的动力学过程,成功研制了一种紧凑型高相干性的全光纤超连续光谱源。种子源为工作在全正色散域的耗散型全光纤锁模激光器,采用了非线性偏振旋转锁模技术,输出的耗散孤子脉冲宽度为5.18ps,重复频率为24MHz。种子光脉冲经过15m双包层掺镱光纤放大后,耦合到长度为10m的光子晶体光纤中,产生了超过一个倍频程的超连续光谱(550~1750nm),最大输出功率为700mW。系统研究了耗散孤子的放大过程以及光子晶体光纤反常色散区产生超连续谱的动力学过程和机理。
The kinetics of the amplification and nonlinear broadening of dissipative solitons are investigated and a compact, highly coherent all-fiber supercontinuum source has been successfully developed. The seed source is a dissipative all-fiber mode-locked laser working in the full-positive dispersion domain. The non-linear polarization rotation mode-locking technique is adopted. The output pulse width of the dissipative soliton is 5.18ps and the repetition frequency is 24MHz. The seed light pulse is amplified by a 15m double-clad ytterbium-doped fiber and coupled to a photonic crystal fiber of 10 m in length to produce a supercontinuum (550-1750 nm) with an octave above the maximum output of 700 mW. The process of amplification of dissipative solitons and the kinetics of supercontinuum generation in the anomalous dispersion region of photonic crystal fiber are systematically studied.