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将石英光纤浸入低折射率的染料溶液中,泵浦光沿光纤轴向耦合进入光纤并以全反射方式沿光纤轴向传播,泵浦光的消逝波激励染料分子产生增益.由于增益区域与回音壁模式的消逝场区域在空间很好的重叠,因此显著地提高了泵浦效率,增加了沿光纤轴向的增益长度.将一根直径为265μm的石英光纤浸入三段激光染料溶液中,在622～632,504～518和427～434nm的3个波长范围内同时获得回音壁模式的激光辐射.在消逝波激励及增益耦合方式下,实现了同一根光纤中红绿蓝三色的回音壁模式激光辐射,由此形成一种新型的三色回音壁模式光纤激光器.本文同时从实验和理论方面讨论了回音壁模式激光沿光纤轴向的产生长度随泵浦能量变化的关系.
The quartz fiber is immersed in a low refractive index dye solution and the pump light is coupled axially into the fiber along the fiber axis and propagates along the fiber axis in total reflection and the evanescent wave of the pump light excites the dye molecule to produce a gain.Because the gain region and the echo The evanescent field in the wall mode overlaps well in space and therefore significantly increases the pump efficiency and increases the gain length along the fiber axis. A quartz optical fiber with a diameter of 265 μm is immersed in a three-stage laser dye solution at 622 ~ 632, 504 ~ 518 and 427 ~ 434nm wavelength range of the simultaneous acquisition of the whispering gallery mode laser radiation in the evanescent wave excitation and gain coupling mode to achieve the same fiber red, green and blue color echo-wall mode laser Radiation to form a new type of three-color whispering gallery mode fiber laser.In this paper, the relationship between the generation length of the whispering gallery mode laser along the fiber axis and the pump energy is also discussed experimentally and theoretically.