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利用鞍点定理研究非自治次二次Hamilton系统的周期解问题,在适当条件下,得到了解的存在性结论. 相似文献
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Intense supercontinuum generation in the near-ultraviolet range from a 400-nm femtosecond laser filament array in fused silica 下载免费PDF全文
An intense supercontinuum(SC) in the near-ultraviolet range is generated from filamentation by focusing a 400-nm laser into fused silica with a microlens array(MLA). The spectrum of the SC is shown to be sensitive to the distance between the MLA and fused silica. In our optimal conditions, the near-ultraviolet SC can cover a range of 350-600 nm,where a bandwidth of approximately 55 nm above the 1μJ/nm spectral energy density and 20 nm bandwidth with tens ofμJ/nm are achieved. In addition, the energy conversion efficiency of the 400 nm laser for SC generation is further analyzed.A maximum conversion efficiency of 66% is obtained when the entrance face of fused silica is set around the focus of the MLA. 相似文献
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