Zhu Jiajian, Zhou Pu, Ma Yanxing, Xu Xiaojun, Liu Zejin
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, China.
Opt Express. 2011 Sep 12;19(19):18645-54. doi: 10.1364/OE.19.018645.
Taking the improved SRS threshold formula into consideration, the power scaling of tandem-pumped Yb-doped silica fiber lasers and amplifiers is analyzed by new models. The results show that the power scaling of tandem-pumped Yb-doped fiber lasers and amplifiers is primarily limited by optical damage, SRS and thermal lens, while the pump brightness induced limitation is almost removed. It is also found that tandem-pumped Yb-doped fiber lasers and amplifiers, based upon state-of-art fiber technology, have the potential to achieve a power limit of 70.7 kW with a core diameter of 63.4 μm, and in the case of a strict single-mode fiber, the power limit is about 13.3 kW with a core numerical aperture of 0.03.
