6 February 2008 Design guidelines and characteristics of large flattened mode photonic crystal fibers
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We propose a kind of photonic crystal fiber with flat-top fundamental mode by introducing a depressed central dip into the core of the conventional index-guiding photonic crystal fiber. The design guidelines and characteristics of the large flattened mode photonic crystal fiber (LFM-PCF) are discussed in detail. By appropriate design, the effective area of the LFM-PCF can be increased by a factor of greater than 2 as compared with conventional index-guiding photonic crystal fiber with the same hole and pitch parameters. The improved effective area, single mode operation and flat-top fundamental mode output make LFM-PCF an ideal candidate to realize high power, high beam quality fiber amplifiers and lasers.
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Chujun Zhao, Chujun Zhao, Dianyuan Fan, Dianyuan Fan, Ping Zhou, Ping Zhou, Xiahui Zeng, Xiahui Zeng, Guanghui Chen, Guanghui Chen, Wei Mu, Wei Mu, } "Design guidelines and characteristics of large flattened mode photonic crystal fibers", Proc. SPIE 6823, High-Power Lasers and Applications IV, 68230C (6 February 2008); doi: 10.1117/12.755057; https://doi.org/10.1117/12.755057

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