消逝波激励的双波段光纤回音壁模式激光辐射

将石英光纤浸入低折射率的染料溶液中后构成圆柱形微腔.采用轴向光抽运消逝波激励激光增益的方式，使增益区域局限在圆柱形微腔回音壁模式的模场区域内，由此显著地提高了抽运效率，增加了沿光纤轴向的增益长度.在一根石英光纤的轴向分段填入浓度同为2×10^-3mol/L的罗丹明6G和罗丹明B乙醇溶液，在567—576nm 和592—600nm的两个波长范围内同时获得回音壁模式的激光辐射；分段填入浓度为8×10^-4和8×10^-3mol/L的罗丹明B乙醇溶液， 关键词： 消逝波激励 圆柱形微腔 回音壁模式 双波段激光辐射

Two-wavelength-range whispering-gallery-mode fiber laser pumped by evanescent wave

A cylindrical micro-cavity was made by immersing a silica optical fiber into a low refractive index dye solution.Pumped by evanescent wave along the fiber axis, dye gain was confined in the evanescent field of whispering gallery mode （WGM） of the fiber, which led to a high pumping efficiency and a long gain distance along the fiber axis. When the fiber was immersed into Rhodamine 6G and Rhodamine B dye solution with the same concentration of 8×10^-4mol/L but separated to two parts, WGM laser emissions in the wavelength ranges of 567—576nm and 592—600nm were observed; when immersed into Rhodamine B dye solution with two concentrations of 8×10^-4 and 8×10^-3mol/L, WGM laser emissions in the wavelength ranges of 588—595nm and 600—618nm were observed. WGM laser emission in two different wavelength ranges in a single optical fiber was realised, which formed a new kind of WGM laser, the two-wavelength-range WGM fiber Laser.