Dupiol R, Krupa K, Tonello A, Arosa Y, Mansuryan T, Fevrier S, Fabert M, Modotto D, Wabnitz S, Millot G, Couderc V
Opt Lett. 2024 Sep 15;49(18):5111-5114. doi: 10.1364/OL.529507.
We experimentally study the spatial beam profile and the spectral broadening at the output of a multimode air-silica microstructure fiber taper, used along the direction of an increasing fiber diameter. By using a laser pump at 1064 nm emitting 60 ps Gaussian beam pulses, we observed a competition between Raman beam cleanup and Kerr beam self-cleaning: the multimode frequency conversion process permits to generate spectral sidebands with frequency detuning from the pump that are difficult to obtain in standard graded-index multimode fibers. The generated supercontinuum spans from 500 nm up to 2.5 µm.
我们通过实验研究了沿光纤直径增大方向使用的多模空气-二氧化硅微结构光纤锥输出端的空间光束轮廓和光谱展宽。通过使用发射60皮秒高斯光束脉冲的1064纳米激光泵浦，我们观察到拉曼光束净化和克尔光束自净化之间的竞争：多模频率转换过程允许产生与泵浦频率失谐的光谱边带，这在标准渐变折射率多模光纤中很难获得。产生的超连续谱范围从500纳米到2.5微米。
