Abstract In the study, we investigate the generation of optofluidic laser in stable planar-concave Fabry–Perot (FP) microcavities. The concave mirror is created on the end-facet of a fiber using the method of CO2 laser ablation and subsequent coating with dielectric layers. Coumarin 6 in ethanol is used as the gain solution to test the FP microcavities. For comparison, we first test the laser generation in a stable FP microcavity formed by a concave mirror on a fiber and a planar mirror on the substrate of a fused silica without cavity assembly. In this configuration, we can obtain the laser emission with an ultralow pumping energy of 25.5 μ J/ mm2 at the gain concentration of 10 μ M and a detection limit of gain solution as low as 2 μ M. Then, the generation of optofluidic laser is explored in a polymeric optofluidic chip integrated with a stable fiber FP microcavity in the format of planar-concave mirrors and a microfluidic channel. Laser results in this configuration show a laser threshold of 36.9 μ J/mm2 at the gain concentration of 10 μ M and a deduced Q-factor of 7.8 × 105 of the FP microcavity.

中文翻译：

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在稳定的光纤法布里-珀罗微腔中生成光流体激光器

摘要 在这项研究中，我们研究了在稳定的平面凹法布里-珀罗 (FP) 微腔中产生光流体激光。凹面镜是使用 CO2 激光烧蚀方法在光纤端面上创建的，然后用介电层涂覆。乙醇中的香豆素 6 用作测试 FP 微腔的增益溶液。为了进行比较，我们首先测试了稳定的 FP 微腔中的激光生成，该微腔由光纤上的凹面镜和熔融石英基板上的平面镜形成，没有腔体组件。在这种配置下，我们可以在增益浓度为 10 μ M 和增益溶液检测限低至 2 μ M 时获得 25.5 μ J/ mm2 的超低泵浦能量。然后，在聚合物光流体芯片中探索了光流体激光器的产生，该芯片与平面凹面镜和微流体通道形式的稳定光纤 FP 微腔集成。此配置中的激光结果显示，增益浓度为 10 μ M 时的激光阈值为 36.9 μ J/mm2，FP 微腔的推导 Q 因子为 7.8 × 105。