The upconverted blue fluorescence in Er_3+ doped silica fibers pumped by aCW 1064 nm laser can be generated through a three--photon process.

• 在1064um连续激光泵浦下,掺铒石英光纤中的铒离子通过三光子(双光子吸收和单光子吸收)过程能产生频率上转换蓝荧光。