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采用轴向隐失波激励增益的方式,使激光增益区域局限在光纤回音壁模式的模场区域内,显著地降低了回音壁模式光纤激光辐射的抽运阈值,由此形成一种低阈值的回音壁模式光纤激光器。在微焦耳量级的低抽运能量条件下,用回音壁模式光纤激光器研究了激光染料的浓度效应。实验结果表明,随着激光染料浓度的增加,回音壁模式激光辐射的波长向长波方向移动,激光波长范围变宽。用回音壁模式染料激光的四能级模型得到激光上能级和所有能级上的分子数比值γ(λ)曲线后,很好地解释了实验结果。低抽运阈值的回音壁模式光纤激光器,为研究液体激光现象提供了极为便利的手段。
The axial gain of the evanescent wave is used to limit the laser gain region in the mode field of the fiber optic whispering gallery and significantly reduce the pumping threshold of the whispering gallery mode fiber laser radiation and thus form a low threshold Echo Wall Mode Fiber Laser. The effect of concentration of laser dyes was studied by whispering gallery mode fiber laser at low pump energy at micro joule. The experimental results show that with the increase of the laser dye concentration, the wavelength of the laser radiation in the whispering gallery mode is shifted to the longer wavelength, and the laser wavelength range is broadened. The experimental results are well explained by using the four-level model of the acoustical wall mode dye laser to obtain the γ (λ) curve of the ratio of the number of molecules on the laser’s energy level and all energy levels. Low pumping threshold whispering gallery mode fiber lasers provide an extremely convenient means of studying liquid laser phenomena.