International School of Photonics, Cochin University of Science and Technology, Cochin-22, India.
Opt Lett. 2013 Sep 1;38(17):3261-3. doi: 10.1364/OL.38.003261.
Whispering gallery mode (WGM) laser emission has been observed from rhodamine B doped polymer optical graded index (GI) fiber by transverse pumping with a frequency doubled Q-switched Nd:YAG laser. The propagation and confinement of these modes were also observed. A variation in the free spectral range from 0.29 to 1.24 nm is obtained along the length due to the confinement of WGMs in the GI fiber.
通过用倍频调 Q 的 Nd:YAG 激光横向泵浦，从罗丹明 B 掺杂聚合物光纤的光学渐变折射率（GI）光纤中观察到 whispering gallery 模式（WGM）激光发射。还观察了这些模式的传播和限制。由于 WGM 在 GI 光纤中的限制，沿光纤长度获得了从 0.29nm 到 1.24nm 的自由光谱范围的变化。
