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中文摘要：
设计了一种用非线性光子晶体光纤直接输出超连续贝塞尔光束的方案。先用光纤熔接机在高非线性光子晶体光纤的输出端塌陷1 mm左右,然后将飞秒激光直接耦合到该非线性光子晶体光纤中,所产生的超连续光谱通过塌陷区域的模式耦合和相干叠加,直接输出了宽谱贝塞尔光束。该方案可以实现全光纤运转,不需要引入其他分立器件。从光纤中直接输出的超连续贝塞尔光束在米量级具有高度准直和无衍射特性。进一步实验验证了该光束在整个超连续光谱范围内具有贝塞尔光束的无衍射性和自恢复性。
英文摘要：
A scheme of broadband spectrum Bessel beams directly output from a nonlinear photonic crystal fiber is designed. A femtosecond laser beam from a nonlinear polarization evolution laser system is directly coupled into a nonlinear photonic crystal fiber that is collapsed 1 mm by a fiber fusion splicer to enable the direct generation of broadband spectrum Bessel beams due to the modes coupling and coherent superposition at the collapsed district. The system operation can be achieved by all fiber without any other discrete devices.The broadband spectrum Bessel beams directly output from photonic crystal fiber have diffraction- free propagation in meter- scaled free space and are proved to have the characteristics of diffraction- free and selfheal in all spectrum.
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