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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,在588—595nm和600—618nm的两个波长范围内同时获得回音壁模式的激光辐射.在同一根光纤中实现了两种不同波长范围的回音壁模式激光辐射,由此形成一种新型的光纤激光器———双波段回音壁模式光纤激光器.
The quartz optical fiber is immersed in a low refractive index dye solution to form a cylindrical microcavity.With the axial light pumping evanescent wave excitation laser gain mode, the gain region is limited to the mode field of the cylindrical microcavity whispering gallery mode, Thereby significantly improving the pumping efficiency and increasing the gain along the axial length of the fiber in a silica optical fiber axial section filled with the same concentration of 2 × 10-3mol / L of rhodamine 6G and rhodamine B Ethanol solution in the wavelength range of 567-576nm and 592-600nm at the same time to obtain the echo wall mode laser radiation; segmented fill concentrations of 8 × 10-4 and 8 × 10-3mol / L of rhodamine B ethanol Solution, both in the wavelength range of 588-595nm and 600-618nm echo-wall mode of laser radiation obtained in the same fiber to achieve two different wavelength range echo wall mode laser radiation, thus forming a new type Fiber lasers - dual-band whispering gallery mode fiber lasers.