光谱学与光谱分析 |
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Study on the Supercontinuum Generation with Femtosecond Pulse in Photonic Crystal Fiber |
WEI Yuan-fei, ZHAO Fu-li*, SHEN Peng-gao, WU Shi-qiang |
State Key Laboratory of Optoelectronic Materials and Technologies of Sun Yat-sen University, Guangzhou 510275, China |
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Abstract Physical mechanism of supercontinuum generation in photonic crystal fiber by femtosecond laser pulse has beeo investigated experimentally. In this study, we used the tunable output wavelength Ti: sapphire optical parametric amplifier as the pump source and the fiber spectrometer acquired the spectrogram of supercontinuum generation in photonic crystal fiber under different power and wavelength conditions, then we normalized the spectrograms and make a comparison of them. PCF supercontinuum differences affected by physical mechanisms were analyzed. We found that when increasing the incident pump pulse power, the spectral width will be gradually widened, there are more peaks, part of the energy will transfer in to the short-wavelength region; as long as it reaches a certain intensity, width of supercontinuum finally saturated, the shape of supercontinuum was also stabilized. As the incident power was settled at 300 milliwatt and the length of PCF was settled at 105 millimeter, experimental results show that width and shape of supercontinuum are affected by the wavelength of pump pulse, in the range of 760 to 840 nm, there appears more and more peaks with the increase of incident wavelength; at anomalous dispersion the spectrogram of supercontinuum generation will be more flat and more wider as the wavelength of pump pulse closer to zero point.
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Received: 2014-10-10
Accepted: 2015-01-15
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Corresponding Authors:
ZHAO Fu-li
E-mail: stszfl@mail.sysu.edu.cn
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