The spectral broadening of a blue optical pulse and the modulation of a pulse waveform in a photonic crystal fiber by induced-phase modulation
The spectral broadening of a blue optical pulse and the modulation of a pulse waveform in a photonic crystal fiber by induced-phase modulation
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DOI：
10.1016/j.optcom.2005.12.015
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发表时间：
2006-05
影响因子：
2.4
通讯作者：
N. Karasawa;T. Takei;K. Yamaguchi
中科院分区：
文献类型：
--
作者：
N. Karasawa;T. Takei;K. Yamaguchi
通过在光子晶体光纤（PCF）中共传一个来自钛宝石振荡器的基频光脉冲和一个蓝色二次谐波光脉冲，利用诱导相位调制（IPM）在78 MHz重复频率下观察到了蓝色二次谐波光脉冲在380 ~ 600 nm范围内的光谱展宽。从实验和计算的光谱强度的延迟时间依赖性，据推测，观察到最大的光谱展宽时，二次谐波脉冲与输入端附近的PCF，其中的基本脉冲被压缩的时间，由于自相位调制和负群速度色散的基本脉冲相互作用。从模拟结果可以看出，IPM对基频脉冲的裂变过程有很强的影响。
By copropagating a fundamental pulse and a blue second-harmonic pulse from a Ti:Sapphire oscillator in a photonic crystal fiber (PCF), the spectral broadening of the blue second-harmonic pulse from 380 to 600nm has been observed by use of induced-phase modulation (IPM) at a 78-MHz repetition rate. From the experimental and the calculated delay time dependence of spectral intensities, it was inferred that the largest spectral broadening was observed when the second-harmonic pulse interacted with the fundamental pulse near the input end of a PCF, where the fundamental pulse was compressed temporally due to self-phase modulation and negative group velocity dispersion. From the simulation, the mechanism of spectral broadening was clarified and the fission process of the fundamental pulse was shown to be influenced strongly by IPM.