Author Affiliations
Abstract
1 Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou, Fujian 350002, China
2 University of Chinese Academy of Sciences, Beijing 100039, China
3 Department of Photonics, National Sun Yat-sen University, Kaohsiung, Taiwan
4 Department of Applied Physics, East China Jiaotong University, Nanchang, Jiangxi 330013, China
In this paper, we reported a multiwavelength passively Q-switched Yb3+:GdAl3(BO3)4 solid-state laser with topological insulator Bi2Te3 as a saturable absorber (SA) for the first time, to the best of our knowledge. Bi2Te3 nanosheets were prepared by the facile solvothermal method. The influence of three Bi2Te3 densities on the laser operation was compared. The maximum average output power was up to 57 mW with a pulse energy of 511.7 nJ. The shortest pulsewidth was measured to be 370 ns with 110 kHz pulse repetition rate and 40 mW average power. The laser operated at three wavelengths simultaneously at 1043.7, 1045.3, and 1046.2 nm, of which the frequency differences were within the terahertz wave band. Our work suggests that solvothermal synthesized Bi2Te3 is a promising SA for simultaneously multiwavelength laser operation.
Lasers, diode-pumped Lasers, Q-switched Lasers, solid-state Lasers, ytterbium Photonics Research
2015, 3(3): 03000A97
1 东北农业大学生命科学学院, 黑龙江 哈尔滨150030
2 中国环境科学研究院水环境系统工程研究室, 北京100012
采集黑龙江省兴凯湖4个点位沉积物样品（样品号HXXD, HXXX, HXDX, HXDB）, 开展了沉积物富里酸(fulvic acid, FA)荧光特性研究。 二维荧光光谱、 三维荧光光谱均显示HXXD点位FA的主要荧光峰均出现在较长波长处。 FA荧光光谱特征参数分析表明, 各点位富里酸腐殖化程度为: HXXD>HXDX>HXDB>HXXX。 其中HXXD点位FA以陆源输入为主, 而其他点位FA则陆源与水生生物源并存。 利用荧光区域积分（FRI）技术, 对FA的三维荧光光谱5个区域（Ⅰ-Ⅴ）的荧光响应值比例（percent fluorescence response, Pi, n）比较证实, 所有点位类胡敏酸区域（Ⅴ区）的PⅤ, n、 类富里酸（Ⅲ区）的PⅢ, n均占有较大的比例, 同时采用三维荧光区域积分法判断各点位FA腐殖化程度与二维荧光特性结论一致。 三维荧光光谱中r(A, C)值与区域积分（FRI）中PⅤ, n/PⅢ, n及(PⅤ, n+PⅢ, n)/(PⅠ, n+PⅡ, n+PⅢ, n)均具有显著的相关性, 因此, r(A, C)值是兴凯湖沉积物FA腐殖程度表征的一个方便、 快捷的参数。
兴凯湖 沉积物 富里酸 荧光光谱 区域积分 Xingkai lake Sediment Fulvic acid Fluorescence spectroscopy Region integration 光谱学与光谱分析
2013, 33(7): 1824
