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Proceedings Paper

Investigation of shortwave edge in high-power supercontinuum with different peak power
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Paper Abstract

The peak power of pump pulse is a key factor in the generation of supercontinuum source. Observably, as the peak power of the pump pulse increases, the spectral range of the supercontinuum becomes wider. In order to study the blue shift limit of PCF fiber at different peak powers, in our experiment, the change in peak power is achieved by introducing a different length of chirped fiber after the oscillator to vary the pulse width. The pump source is a self-made laser with pulse duration, operating wavelength and repetition rate of 12 ps, 1064 nm and 68 MHz, respectively, which are injected into the photonic crystal fiber after three stages of amplification. Finally, a supercontinuum with an average power of 358 W in the spectral range of 466 nm to 2400 nm was achieved. Experiments have shown that the introduction of large positive chirp has a significant effect on the supercontinuum of the 10 W class, but for a supercontinuum with a sufficiently high average power (over 100 W level supercontinuum spectrum). after the peak power threshold is exceeded, further blue shift of the spectrum cannot be achieved by increasing the peak power, but the high peak power helps to improve the spectral flatness of the supercontinuum. The four-wave mixing, dispersive wave generation, radiation trapping with the soliton play much important role in the blue-shift of SC spectrum, but the short-wave edge is limited by the group velocity matching condition, which is determined by the dispersion characteristics of the PCF, not only peak power of the pump pulse. In order to further extend the short-wave spectrum, other methods are required, for example, changing the structural characteristic of the PCF, etc.

Paper Details

Date Published: 19 November 2019
PDF: 6 pages
Proc. SPIE 11181, High-Power Lasers and Applications X, 111810L (19 November 2019); doi: 10.1117/12.2535819
Show Author Affiliations
Yue Li, Laser Fusion Research Ctr. (China)
Kegong Dong, Laser Fusion Research Ctr. (China)
Key Lab. of Science and Technology on High Energy Laser (China)
Donglin Yan, Laser Fusion Research Ctr. (China)
Honghuan Lin, Laser Fusion Research Ctr. (China)
Jianjun Wang, Laser Fusion Research Ctr. (China)
Haoyu Zhang, Laser Fusion Research Ctr. (China)
Key Lab. of Science and Technology on High Energy Laser (China)


Published in SPIE Proceedings Vol. 11181:
High-Power Lasers and Applications X
Ruxin Li; Upendra N. Singh; Shibin Jiang, Editor(s)

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