报告时间:2016年8月29日(周一)上午9:00
报告地点:北校区西大楼III-405
报告题目:基于新型二维材料的宽带可饱和吸收体研究
报告摘要:
自石墨烯开始,基于新型二维材料的宽带可饱和吸收体研究成为超快光子学的研究热点。但其制备技术和光学性能还不成熟,较低的损伤阈值和较慢的恢复时间是制约光纤激光器窄脉宽和高能量锁模脉冲输出的主要因素。
近期,本研究组利用磁控溅射镀膜工艺制备二维材料可饱和吸收体,选用高导热性材料碳化硅片、抛光铜片等作为衬底,从而提高可饱和吸收体的抗损伤阈值。首次利用二维材料可饱和吸收锁模技术结合非线性偏振旋转锁模技术研制出超窄脉宽掺铒光纤激光器,实现了70飞秒锁模脉冲激光输出。
报告人简介:刘文军
副教授,博士生导师,北京邮电大学电子科学与技术博士学位,中国科学院物理研究所博士后。目前共发表论文100余篇,他引1000余次,主持和参与国家自然科学基金、横向项目多项。2012年以来,主要从事二维材料可饱和吸收体的设计、制备以及在光纤激光器中的应用工作。
报告题目:激光透明陶瓷的组分调控、结构设计与性能优化
报告摘要:
作为新一代固体激光材料,激光透明陶瓷对国家安全和国民经济可持续发展具有重大意义。激光陶瓷在理化性能上具有单晶和玻璃无可比拟的优势,同时陶瓷制备工艺为激光器设计提供了灵活性,通过调整陶瓷的物理和化学特性,有可能得到常规固体激光器所不具备的特性。
本研究从石榴石基透明陶瓷的组分、结构的可设计性与可调控性出发,设计和制备了不同稀土离子掺杂的钇铝石榴石(RE:YAG)或镥铝石榴石(RE:LuAG)基透明陶瓷及其复合结构,实现了激光陶瓷性能的裁剪与优化。重点阐述了平面波导结构YAG/RE:YAG/YAG透明陶瓷的可控制备与性能优化。
报告人简介:李江
研究员,博士生导师。中国科学院上海硅酸盐研究所透明陶瓷研究中心副主任,中国科学院拔尖青年人才。2007年获中国科学院上海硅酸盐研究所工学博士学位。主要从事光功能透明陶瓷(包括:激光陶瓷、闪烁陶瓷、磁光陶瓷、荧光陶瓷等)的研究。以项目负责人承担JPPT项目、军工863项目、国家自然科学基金等10余项。迄今在J. Am. Ceram. Soc.,J. Eur. Ceram. Soc., Opt. Lett.,Opt. Express,Opt. Mater. Express等期刊上发表论文190余篇(其中第一及通讯作者100余篇);合著科学出版社专著《先进光功能透明陶瓷》和《高温结构陶瓷研究浅论》;参与1部英文专著部分章节的撰写;申请中国发明专利32项。目前为J. Am. Ceram. Soc.,Opt. Lett.,Opt. Express等36种专业期刊的通信审稿人。
报告题目:High-Repetition-Rate Sub-Cycle Waveform Synthesis
报告摘要:
Waveform Nonlinear Optics aims to study and control the nonlinear interactions of matter with custom-tailored sub-optical-cycle waveforms. In this regime, the time-evolution of the optical electric field deviates strongly from a sinusoidal carrier-wave oscillation with in a single cycle of light, so that the usual approximations of nonlinear optics break down, and new phenomena and opportunities arise. Specifically, a novel multi-channel parametric synthesizer driven by a KW-level pump-laser will overcome pulse-energy and average-power bottlenecks for advanced applications. Such intense optical high-repetition-rate waveforms custom-sculpted within an optical cycle open up new horizons for controlling strong-field interactions in atoms, molecules, solids and nanostructures.
报告人简介:方少波(Shaobo Fang)
Shaobo received his bachelor degree from the College of Precision Instrument & Opto-electronics Engineering of Tianjin University, and his doctoral degree from Hokkaido University (Japan). From 2007 to 2011, he was an assistant research scientist of the Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST). Since 2011 he has been a research scientist in the framework of the Helmholtz Association Young Scientist Program at DESY/CFEL. From 2015, Shaobo joined the Institute of Physics, Chinese Academy of Sciences, as an associate professor. His research interests include sub-cycle waveform synthesis and novel monocycle pulse generation for attoscience and compact X-ray sources.