红外与毫米波学报, 2015, 34 (2): 196, 网络出版: 2015-05-20
高非线性光纤正常色散区皮秒脉冲泵浦产生的超连续谱平坦性
Flatness of supercontinuum generated by a picosecond pulse in normal dispersion region of highly nonlinear fiber
摘要
数值仿真研究了双曲正割、高斯(m=1)、超高斯脉冲(m=5)形皮秒脉冲泵浦在高非线性光纤正常色散区中时频域演化特性.计算结果表明,在峰值功率、泵浦光纤参数相同的条件下,泵浦脉冲前(后)沿陡峭程度影响频谱展宽宽度,脉冲前后沿越陡峭,生成的超连续谱带宽越宽;脉冲前(后)沿的拖尾部影响展宽频谱的平坦性,脉冲前后沿拖尾越小,生成的超连续谱频带平坦度越高.泵浦脉冲中是否含有啁啾对生成的超连续谱的带宽和平坦性影响微弱.脉冲前(后)沿拖尾小或者陡峭的脉冲在高非线性光纤正常色散区可以产生带宽平坦的超连续谱.
Abstract
The evolutional waveforms and spectrograms of sech, gaussian pulse (m=1) and supergaussian pulse (m=5) generated in normal dispersion region of high nonlinear fiber were numerically studied. The results indicate that the tail at both front and back edge of the pulse not only affects spectrum broadening, but also the flatness of supercontinuum. The chirp of pump pulse has little impacts on the generated supercontinuum. The pulse with high power, steep edge and small tail is preferable to generate wideband and flat supercontinuum.
贾楠, 李唐军, 孙剑, 钟康平, 王目光. 高非线性光纤正常色散区皮秒脉冲泵浦产生的超连续谱平坦性[J]. 红外与毫米波学报, 2015, 34(2): 196. JIA Nan, LI Tang-Jun, SUN Jian, ZHONG Kang-Ping, WANG Mu-Guang. Flatness of supercontinuum generated by a picosecond pulse in normal dispersion region of highly nonlinear fiber[J]. Journal of Infrared and Millimeter Waves, 2015, 34(2): 196.
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