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Low-threshold supercontinuum generation from an extruded SF6 PCF using a compact Cr~(4+):YAG laser

机译:使用紧凑型Cr〜(4 +):YAG激光器从SF6 PCF挤出机产生低阈值超连续谱

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摘要

The modal properties of an extruded SF6 photonic crystal fiber (PCF) have been analyzed on the basis of a full-vector model. The favorable dispersion properties (the zero-dispersion wavelength for a PCF with 4.5-μm core size lies at approximately 1.5 μm) and the large nonlinearity figure of up to 280 W~(-1) km~(-1) may provide more than an octave of spectral broadening with launched pulse energies below 200 pJ. In agreement with simulations, experiments have demonstrated the low-energy spectral broadening under excitation by 60-70-fs pulses from a compact mode-locked Cr~(4+):YAG laser operating at a 100-MHz repetition rate. Besides the spectral broadening due to the soliton-fission mechanism, the rich mode structure of the fiber allows third-order harmonic generation and four-wave mixing, which extend the supercontinuum spectrum down to the visible-wavelength range.
机译:在全矢量模型的基础上,对挤出的SF6光子晶体光纤(PCF)的模态特性进行了分析。良好的色散特性(芯尺寸为4.5μm的PCF的零色散波长约为1.5μm),高达280 W〜(-1)km〜(-1)的大非线性系数可提供发射脉冲能量低于200 pJ时频谱扩展的倍频程。与仿真结果一致,实验证明了紧凑型锁模Cr〜(4 +):YAG激光器以100-MHz重复频率工作时,在60-70-fs脉冲激发下的低能谱展宽。除了由于孤子裂变机理引起的光谱展宽外,光纤的丰富模式结构还可以产生三次谐波和四波混频,从而将超连续谱扩展到可见波长范围。

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