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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。
A scheme was proposed to directly output supercontinuum Bessel beams with nonlinear photonic crystal fibers. First, a fiber splicer was used to collapse about 1 mm at the output of a highly nonlinear photonic crystal fiber. The femtosecond laser was then directly coupled into the nonlinear photonic crystal fiber. The resulting supercontinuum was mode-coupled and coherent through the collapsed area Superposition, direct output of broad-spectrum Bezier beams. The program can achieve full fiber operation, do not need to introduce other discrete devices. Supercontinuum Bessel beams directly from the fiber are highly collimated and non-diffracting on the order of meters. Further experiments demonstrate that the beam has the non-diffraction and self-restoring properties of Bessel beams over the entire supercontinuum spectrum.