CAJ | 학술논문

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.
본문이용비선성편진쇄모격광기산생적중복빈솔50 MHz,맥관위1.8 ps적맥충분별추운외경균균화색산점감량충고비선성광자정체광섬,재삼계비선성효응(자상위조제、교차상위조제、사파혼빈화수격랍만산효응등)화색산공동작용하득도확전지람광부분적초련속보.모의료광보재색산점감광섬화균균광섬중적전관과정,통과대비균균광섬발현색산점감광섬재조공색산,가강랍만고자화색산파적군속도필배조건,산생초대관광보방면구유흔대우세.실험이용20 m장적색산점감광섬,득도료406.1지671.8 nm적가견광파단증강적교위평탄적초련속보.
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.