期刊
OPTICS EXPRESS
卷 24, 期 12, 页码 12600-12606出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.012600
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资金
- National Natural Science Foundation of China (NSFC) [61235008, 61435009, 11504424]
- Hunan Provincial Natural Science Foundation of China [14JJ3001]
- Graduate Student Innovation Foundation of National University of Defense Technology [B150703]
An ultra-broadband supercontinuum was generated in a short piece of step-index germania-core fiber using a fiber laser with a peak power of 4.4 kW. The pure germania core made this fiber capable of propagating light towards the desirable mid-infrared region. The spectral broadening characteristics towards the mid-infrared region under different lengths of germania-core fiber were investigated using pump pulses of 4.4 kW and 1.1 ns at 1550 nm. The large nonlinear refractive index of germania and the small core size of germania-core fiber produced a nonlinear coefficient as high as 11.8 (W km)(-1) at 1550 nm, which was beneficial for supercontinuum generation. The pump wavelength was located in the anomalous dispersion regime and close to the zero dispersion wavelength of this germania-core fiber, 1.426 mu m. Eventually, an ultra-broadband supercontinuum source with a spectrum spanning from 0.6 to 3.2 mu m was obtained and had a total output power of 350 mW at an optimized germania-core fiber length of 0.8 m. This work is the first demonstration, to the best of our knowledge, of a germania-core fiber-based ultra-broadband supercontinuum source that spans from the visible region to the mid-infrared region. (c) 2016 Optical Society of America
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