在色散渐减光子晶体光纤中产生超连续谱的实验研究
Experimental study on supercontinuum generation in zero-dispersion wavelength decreasing photonic crystal fiber
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摘要: 本文利用非线性偏振锁模激光器产生的重复频率50 MHz,脉宽为1.8 ps的脉冲分别抽运外径均匀和色散渐减两种高非线性光子晶体光纤,在三阶非线性效应(自相位调制、交叉相位调制、四波混频和受激拉曼散效应等)和色散共同作用下得到扩展至蓝光部分的超连续谱.模拟了光谱在色散渐减光纤和均匀光纤中的展宽过程,通过对比均匀光纤发现色散渐减光纤在调控色散,加强拉曼孤子和色散波的群速度匹配条件,产生超带宽光谱方面具有很大优势.实验利用20 m长的色散渐减光纤,得到了406.1至671.8 nm的可见光波段增强的较为平坦的超连续谱.
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关键词:
- 超连续谱 /
- 色散渐减光子晶体光纤 /
- 群速度匹配 /
- 非线性效应
Abstract: We have carried out experimentally the supercontinuum generation in GeO2-doped-core uniform photonic crystal fiber and zero-dispersion wavelength-decreasing photonic crystal fiber with pump pulses 1.8 ps operating at 1040 nm. Dispersion and nonlinear effects such as cross-phase modulation, four-wave mixing, modulation instability play a crucial role as they extend the supercontinuum towards short wavelength side. Zero-dispersion wavelength-decreasing photonic crystal fiber can improve group-velocity matching between solitons and dispersive waves deduced from numerical simulation of the evolution of spectra generated in a taper and uniform fiber. We obtained experimentally a spectrum expanding to the blue side and the power variation is indeed of 10 dB over a spectral range of 165.7 nm (between 4061 and 6718 nm) in the taper fiber. -
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