Järvinen Samu T, Walter Dominik, Bürsing Helge
Opt Express. 2021 Aug 30;29(18):28441-28451. doi: 10.1364/OE.430632.
We analyzed the formation of mid-infrared conical emission patterns possessing spiral and half-ring shaped wavelength contours from a beam of a few optical filaments. The complex patterns were generated and modified experimentally by adaptive wavefront shaping of the femtosecond laser pulse. Mutual interactions between co-propagating filaments can induce curvature in their paths, and the spiral and half-ring emissions were shown to be a direct consequence of this angular deflection. Based on our experimental and computational results, the spirals form in the far-field due to self-interference of conical emission from a helically moving filament. The presented findings will advance the tailoring of spatial conical emission patterns potentially beneficial for spectroscopic applications and terahertz generation.
我们分析了由几根光学细丝束形成的具有螺旋形和半环形波长轮廓的中红外锥形发射图案。通过飞秒激光脉冲的自适应波前整形，实验性地产生并修改了这些复杂图案。共传播细丝之间的相互作用会在其路径中引起曲率，并且螺旋形和半环形发射被证明是这种角偏转的直接结果。基于我们的实验和计算结果，螺旋形在远场中由于螺旋运动细丝的锥形发射的自干涉而形成。所呈现的研究结果将推动空间锥形发射图案的定制，这可能对光谱应用和太赫兹产生有益。
