大锥角光纤探针的制备

Fabrication of Large Cone Angle Optical Fiber Probe

用熔拉法、腐蚀法、管腐蚀法、熔拉-腐蚀法、激光消融法等制备了光纤探针,对其外形进行了分析比较。熔拉法制作的探针,锥形过渡区细长,并且获得的探针锥角不大(8°～35°)。腐蚀法与管腐蚀法可以使探针的锥形过渡区短,损耗小,锥角大(15°～65°),但在制备更大的锥角光纤探针时,表面开始变得粗糙。拉伸-腐蚀的方法制作光纤探针存在一个变锥度区。激光消融腐蚀法容易获得大锥角的探针,并且表面光滑。

The optical fiber probe is prepared with the melt-pulling etching, tube etching, pulling-etching and laser ablation method. By the experiments, the shapes of fiber probe are analyzed and compared. It shows that the cone-shape transition region of probe by the melt-pulling is slight and the probe cone angle is not big （8°～35°）. The method of etching and the tube etching may cause the probe with the short cone-shape transition region, less loss, and the cone angle is bigger （15°～ 65°）. But when the much bigger cone angle optical fiber probe is prepared, the surface becomes rough. Probe by the pullingetching has an variable area of the changing cone angle. Probe by the laser ablation is easy to obtain the big cone angle, and the surface is smooth.