He Shilong, Zhang Xiaojuan, Du Wenyu, Li Siqi, Kuai Yan, Xu Feng, Liu Yu, Cao Zhigang, Yu Benli, Hu Zhijia
Opt Lett. 2024 Aug 15;49(16):4733-4736. doi: 10.1364/OL.531026.
Random lasers (RLs), with their low spatial coherence, are ideal illumination sources for speckle-free imaging. However, it is still challenging for RLs to maintain low spatial coherence with the need for integration and directionality. Here, a disordered multimode random polymer fiber laser (RPFL) is proposed and implemented as a low-spatial-coherence light source. Compared to typical multimode optical fibers, the number of accommodated modes is increased by about 11×, the speckle contrast is reduced to 0.013, and the spatial coherence factor is reduced to 0.08. The low-spatial-coherence property enables RPFL to produce significantly superior imaging quality in both speckle-free imaging and non-invasive imaging through opacity. This study provides a strategy for an integrated speckle-free imaging system and paves the way for non-invasive imaging.
随机激光器（RLs）因其低空间相干性，是无散斑成像的理想照明源。然而，对于随机激光器来说，要在满足集成性和方向性需求的同时保持低空间相干性仍具有挑战性。在此，提出并实现了一种无序多模随机聚合物光纤激光器（RPFL）作为低空间相干光源。与典型的多模光纤相比，容纳的模式数量增加了约11倍，散斑对比度降低到0.013，空间相干因子降低到0.08。低空间相干特性使RPFL在无散斑成像和透过不透明物体的非侵入式成像中均能产生显著更优的成像质量。本研究为集成无散斑成像系统提供了一种策略，并为非侵入式成像铺平了道路。
