Leventoux Y, Parriaux A, Sidelnikov O, Granger G, Jossent M, Lavoute L, Gaponov D, Fabert M, Tonello A, Krupa K, Desfarges-Berthelemot A, Kermene V, Millot G, Février S, Wabnitz S, Couderc V
Opt Express. 2020 May 11;28(10):14333-14344. doi: 10.1364/OE.392081.
We experimentally demonstrate that spatial beam self-cleaning can be highly efficient when obtained with a few-mode excitation in graded-index multimode optical fibers. By using 160 ps long, highly chirped (6 nm bandwidth at -3dB) optical pulses at 1562 nm, we demonstrate a one-decade reduction of the power threshold for spatial beam self-cleaning, with respect to previous experiments using pulses with laser wavelengths at 1030-1064 nm. Self-cleaned beams remain spatio-temporally stable for more than a decade of their peak power variation. The impact of input pulse temporal duration is also studied.
我们通过实验证明，在渐变折射率多模光纤中采用少模激发实现空间光束自清洁时，其效率可以很高。通过使用1562 nm波长、脉宽为160 ps、高啁啾（-3 dB带宽为6 nm）的光脉冲，我们证明与之前使用波长为1030 - 1064 nm激光脉冲的实验相比，空间光束自清洁的功率阈值降低了一个数量级。自清洁光束在其峰值功率变化超过十年的时间内保持时空稳定。我们还研究了输入脉冲持续时间的影响。
