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研究了亚纳秒脉冲抽运光子晶体光纤产生高功率超连续谱的机理.采用掺镱锁模光纤激光器产生的脉宽570ps光脉冲,抽运1.8m光子晶体光纤,得到了平均功率为1.15W、光谱覆盖范围为750nm的超连续谱.通过实验和模拟结果的对比和分析,证实了亚纳秒脉冲抽运1.8m PCF产生超连续谱时,调制不稳定性效应起了重要作用.在研究了不同抽运功率下输出的超连续谱变化后,发现随着抽运功率的提高,输出功率也更高且超连续谱覆盖波段也更宽,在瓦级输出功率下依然未达到饱和展宽状态,还有进一步提高功率和展宽光谱的空间.
The mechanism of high power supercontinuum generation in sub-nanosecond pulsed photonic crystal fiber was studied.The pulsed 570ps optical pulse generated by the Yb-doped mode-locked fiber laser was used to pump 1.8m photonic crystal fiber and the average power was 1.15W , The spectral coverage of the supercontinuum at 750nm.Comparison and analysis of the experimental and simulation results show that the sub-nanosecond pulse pumping 1.8m PCF supercontinuum generation, modulation instability effect played an important role in the study After changing the supercontinuum at different pumping power, it is found that with the increase of pumping power, the output power is also higher and the supercontinuum spectrum is wider. At the watt level, the output power still does not reach the saturation broadening state , There is room to further increase power and broaden the spectrum.