Xu Mengyin, Zhu Jie, Xu Mingfeng, Pu Mingbo, Wang Sha
Opt Lett. 2024 Aug 1;49(15):4350-4353. doi: 10.1364/OL.531951.
Lasers play a significant role in optical communication, medical, and scientific research, owing to their high brightness and high coherence. However, the high spatial coherence will lead to specific challenges, such as speckle noise in imaging and wavefront distortion during propagation through scattering media. Here, a continuous-wave (cw) degenerate cavity laser (DCL) with low spatial coherence is demonstrated with efficient suppression of the thermal lensing effect from the gain crystal. Experimentally, a cw degenerate laser output with about 2000 transverse modes corresponding to a speckle contrast of about 0.0224 is achieved. This laser can be used for speckle reduction and is robust against atmospheric turbulence, which may find applications in the field of laser imaging technology and illumination.
由于具有高亮度和高相干性，激光在光通信、医学和科学研究中发挥着重要作用。然而，高空间相干性会带来特定的挑战，例如成像中的散斑噪声以及在通过散射介质传播时的波前畸变。在此，展示了一种具有低空间相干性的连续波（cw）简并腔激光器（DCL），它有效抑制了增益晶体的热透镜效应。实验上，实现了具有约2000个横向模式、散斑对比度约为0.0224的连续波简并激光输出。这种激光器可用于减少散斑，并且对大气湍流具有鲁棒性，有望在激光成像技术和照明领域得到应用。
