为了简化微泡腔的制备工艺，在传统 $ \text{C}{\text{O}}_{\text{2}} $激光双向加热方案的基础上，采用 $ \text{C}{\text{O}}_{\text{2}} $激光单点加热毛细管。通过精确控制加热温度和气体流速，制备出半球形的微泡腔，进而通过调节激光光斑，增加加热面积的方式制备出球形的微泡腔。使用光学显微镜和原子力显微镜（AFM）对制备的球形微泡腔进行表征，并通过COMSOL仿真验证了所制备微泡腔的性能。所制备的微泡腔表面光滑，壁厚最薄处可达到亚微米量级。研究结果表明，通过 $ \text{C}{\text{O}}_{\text{2}} $激光单点加热制备的微泡腔的壁厚存在轻微的不均匀性，但其谐振Q值仍然较高，可广泛应用于传感领域。

We demonstrate an effective approach of mode suppression by simply using a tungsten probe to destroy the external neck surface of polymer microbottle resonators. The higher-order bottle modes with large axial orders, spatially located around the neck surface of the microresonator, will suffer large optical losses. Thus, excitation just with an ordinary free-space light beam will ensure direct generation of single fundamental bottle mode lasers. This method is with very low cost and convenient and can obtain high side-mode suppression factors. Our work demonstrated here may have promising applications such as in lasing and sensing devices.