School of Physics and Astronomy, University of Southampton, Southampton, Hampshire, United Kingdom.
Aquark Technologies, Romsey, Hampshire, United Kingdom.
PLoS One. 2023 Jul 27;18(7):e0289223. doi: 10.1371/journal.pone.0289223. eCollection 2023.
We report on the achievement of continuous wave bi-frequency operation in a membrane external-cavity surface-emitting laser (MECSEL), which is optically pumped with up to 4 W of 808 nm pump light. The presence of spatially specific loss of the intra-cavity high reflectivity mirror allows loss to be controlled on certain transverse cavity modes. The regions of spatially specific loss are defined through the removal of Bragg layers from the surface of the cavity high reflectivity mirror in the form of crosshair patterns with undamaged central regions, which are created using a laser ablation system incorporating a digital micromirror device (DMD). By aligning the laser cavity mode with the geometric centre of the loss patterns, the laser simultaneously operated on two Hermite-Gaussian spatial modes: the fundamental HG00 and the higher order HG11 mode. We demonstrate bi-frequency operation over a range of pump powers and sizes of spatial loss features, with a wavelength separation of approximately 5 nm centred at 1005 nm.
我们报告了一种膜外腔面发射激光器（MECSEL）在连续波双频操作方面的实现，该激光器采用高达 4 W 的 808nm 泵浦光进行光泵浦。腔内高反射镜的空间特定损耗的存在允许对某些横向腔模进行损耗控制。通过使用包含数字微镜器件（DMD）的激光烧蚀系统，以十字形图案的形式从腔高反射镜的表面去除布拉格层来定义空间特定损耗区域，其中保留了无损坏的中心区域。通过将激光腔模式与损耗图案的几何中心对齐，激光同时在两个 Hermite-Gaussian 空间模式下运行：基本 HG00 和更高阶 HG11 模式。我们在不同的泵浦功率和空间损耗特征尺寸下演示了双频操作，其波长分离约为 5nm，中心波长为 1005nm。
