块状介质超连续谱相位的相干特性
Supercontinuum phase coherence properties in bulk material
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摘要: 块状介质超连续谱由一系列复杂的非线性过程产生。用两路飞秒泵浦光聚焦到熔石英玻璃上得到两束独立的超连续谱，实验上观察到它们形成的稳定干涉条纹；改变两路泵浦光的时间延迟，得到共线超连续谱形成的频率梳。实验证明，块状介质超连续谱的产生保持了泵浦光的相位锁定关系，泵浦光能量抖动和介质的缺陷都不会对超连续谱的相位带来明显的扰动。Abstract: Supercontinuum generation incorporates many nonlinear effects. In our experiment, two supercontinuum pulses generated independently by ultrashort pulses form stable spatial interference fringes and a frequency comb appears with collinear time-delay pump pulses. The supercontinuum keeps phase-lock relationships of the pump beams. Small intensity variations in the pump and small inhomogeneities in the material do not lead to dramatic phase fluctuations in the generated supercontinuum. It is important for supercontinuum simulation and studying of supercontinuum frequency combs in bulk material.
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Key words:
- femtosecond laser /
- supercontinuum /
- phase coherence /
- frequency comb /
- bulk material
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