Low-Spatial-Coherence Random Lasers Enhanced by TiN/Graphene Self-Assembly Structures for High-Resolution Imaging in Chaotic Fluid Environments
Yuan Wan, Zhihao Li, Wenzhi Wang, Liming Gao, Zexu Liu, Lihailiang Xu, Hongzhen Wang, Song Gao, Xianlong Liu, Yangjian Cai
Abstract
Speckle is a persistent disease that damages image quality and needs to be suppressed for optical imaging. One effective method is to use light sources with low spatial coherence. In this article, a low spatial coherence and high brightness random laser based on TiN/Graphene self-assembly structures is proposed. The physical mechanisms of TiN/Graphene self-assembly structures enhancing the radiation properties of random lasers are analyzed in detail. Additionally, the speckle noise is significantly suppressed by the random laser in chaotic fluid environments. The speckle constant is as low as 0.04, making it difficult to observe with the naked eye. Due to its low speckle noise, the image quality illuminated by the random laser is more than 3 times better than that illuminated by a conventional laser. Furthermore, the random laser's high brightness and narrow spectral peaks enable the visualization of finer structures compared to using a halogen lamp. This study paves a new way for random lasers to be used in a variety of applications in chaotic fluid environments, such as speckle-free imaging, bioimaging, projection display, and free-space optical communication.