CAJ | 학술논문

将石英光纤浸入低折射率的激光染料溶液中构成圆柱形微腔.采用沿光纤轴向光抽运的消逝波激励增益方式,获得了沿光纤轴向长距离的激光染料增益,受激辐射光在圆柱形微腔中回音壁模式的支持下形成激光振荡.在直径为288 μm的同一根光纤外分三段分别填入罗丹明6G、罗丹明610和罗丹明640激光染料乙二醇溶液,实现了波长分别在567～575 nm、605～614 nm和656～666 nm三个不同波段的回音壁模式激光振荡,用一根光纤同时获得了红、橙、黄三种不同颜色的激光辐射.对实验所获得的回音壁模式激光光谱做了模式标定,依据标定的模式数计算了各种模式以及抽运光在光纤截面的强度分布.计算结果表明,激光增益区域总是局限在圆柱形微腔回音壁模式的模场区域内,由此可以显著地提高抽运效率,增加抽运光沿光纤轴向的增益长度.
장석영광섬침입저절사솔적격광염료용액중구성원주형미강.채용연광섬축향광추운적소서파격려증익방식,획득료연광섬축향장거리적격광염료증익,수격복사광재원주형미강중회음벽모식적지지하형성격광진탕.재직경위288 μm적동일근광섬외분삼단분별전입라단명6G、라단명610화라단명640격광염료을이순용액,실현료파장분별재567～575 nm、605～614 nm화656～666 nm삼개불동파단적회음벽모식격광진탕,용일근광섬동시획득료홍、등、황삼충불동안색적격광복사.대실험소획득적회음벽모식격광광보주료모식표정,의거표정적모식수계산료각충모식이급추운광재광섬절면적강도분포.계산결과표명,격광증익구역총시국한재원주형미강회음벽모식적모장구역내,유차가이현저지제고추운효솔,증가추운광연광섬축향적증익장도.
A cylindrical micro-cavity is made by immersing a silica optical fiber into a low refractive index dye solution.Optically pumped by evanescent wave along the fiber axis,a long dye gain distance along the fibre axis is obtained,and lasing emission supported by Whispering-Gallery-mode in cylindrical micro-cavity is observed.When a fibre diameter 288 μm is immersed into three glass capillaries filled separately with Rhodamine 6G,Rhodamine 610 and Rhodamine 640 dye ethylene glycol solution,Whispering Gallery Mode laser oscillation in the wavelength ranges of 567～575 nm、605～614 nm and 656～666 nm are observed,three-color lasing emission (red,orange and yellow) from a single optical fibre is realized.The obtained lasing spectra are mode assigned,the spatial intensity distributions of the assigned modes and pumping energy along the fiber′s cross section are calculated.The computational results show that dye gain is confined in the evanescent field of Whispering Gallery Mode of the fiber,which leads to a high pumping efficiency and a long gain distance along the fiber axis.