标题：Efficient graphene Q switching and mode locking of 1.34 (mu)m neodymium lasers
作者：Jin-Long Xu;Xian-Lei Li;Jing-Liang He;Xiao-Peng Hao;Ying Yang;Yong-Zhong Wu;Shan-De Liu;Bai-Tao Zhang
作者机构：[Xu, J.-L] State Key Laboratory of Crystal Materials, Shandong University, 250100 Jinan, China;[ Li, X.-L] State Key Laboratory of Crystal Materials, 更多
通讯作者地址：[Xu, JL]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
摘要：We demonstrate that few-layered graphene sheets used as a saturable absorber can provide efficient Q-switching and mode-locking modulation in 1.34 (mu)m Nd:GdVO_(4) bulk lasers. The minimum Q-switched pulses were 450 ns for 260 mW average power, 43 kHz repetition rate, and 2.5 (mu)J pulse energy. For the mode-locked laser, an average power of 1.29 W was achieved with 11 ps pulse duration and 13 nJ pulse energy. To our knowledge, this average power is the highest yet obtained from a graphene mode-locked laser, and the corresponding optical--optical efficiency of 23percent is the best result among 1.3 (mu)m neodymium mode-locked lasers. The quality factor M~(2) of the Q-switched beam was 1.4 and 1.6 in the horizontal and longitudinal planes, respectively, and the M~(2) of the mode-locked beam reached 1.1 and 1.0. These results clearly indicate the advantages of few-layered graphene as a saturable absorber.