The first ytterbium - doped yttrium - aluminum garnet ( yb : yag ) laser action was reported back in 1965 using a lamp - pumped rod at 77 k . because of poor spectral overlap of the lamp with the the trivalent ytterbium ion ( yb3 + ) absorption band , the efficiency was very low . lamp - pumped nd : yag lasers fared better due to the multiple pump bands of neodymium 但yb3 +离子的泵浦吸收带与闪光灯光谱匹配很差,导致其激光效率很低;而nd : yag的激活离子( nd3 + )有多个泵浦带与闪光灯光谱匹配,较好适应了灯泵浦的需要,长期占据了固体激光器的主导地位。
Ytterbium ( yb ) - doped silica fibers have a broad - gain bandwidth ( 850 ~ 1050nm ) , excellent power conversion efficiency , and a broad - absorption bandwidth ( 900 ~ 1200nm ) . their ability to provide amplification over the very broad wavelength range from ~ 975nm to ~ 1200nm is expected to generate increasing interest in the near future . they offer an almost ideal gain medium for the fiber lasers and fiber amplifiers that work at the wavelength around 1 m 掺镱石英光纤具有几个方面的优点,如能级结构简单,与掺er3 + 、 nd3 +等稀土离子的光纤相比,不存在对泵浦光或信号光的激发态吸收( esa ) ,可以有更高的掺杂浓度;有较宽的吸收光谱( 850 ~ 1050nm ) ,可以利用多种泵浦光源来设计泵浦方案;辐射光谱宽( 900 ~ 1200nm ) ,激光输出波长可以有很宽的可调谐范围。