11月9日学术报告:Compression of high-energy ultrashort laser pulses through a gas-filled tapered planar waveguide

发布者:系统管理员发布时间:2011-10-31浏览次数:10

学术报告:Compression of high-energy ultrashort laser pulses through a gas-filled tapered planar waveguide

报告  人:陈世华 副教授

报告时间119(周三下午2:00

报告地点:九龙湖校区田家炳楼南楼203

    要:

High-energy light pulses down to few optical cycles are key to a wide variety of applications, driving a quest for reliable, stable, and cost-efficient lasers and light pulse manipulations. On the laser side, the necessary technology has highly matured. As such for the ultrafast optics community, one of the most interesting challenges concerns how to compress the laser pulse to a desired duration with a nice, focusable spatial mode and a high energy throughput.

To date, there are several compression schemes such as those based on hollow core fibers and filamentation that can lead to pulse durations down to the few-cycle regime. But mostly the output energy is confined within the submillijoule level due to material damage or intensity clamping. In this work, we propose a hollow tapered planar waveguide kept flared forward for compression of high-energy ultrashort laser pulses, primarily motivated by a recent technology focus that claimed that a tapered waveguide triumphs over the ridge and stripe ones when designed for high-power diode lasers [see Nature Photonics 3, 24-25 (2009)]. We demonstrate that, when applying to high-energy ultrashort pulse compression, such a flared-taper configuration has the merit of combining the high output powers with the high beam quality previously not easily attainable in a conventional hollow planar waveguide, thereby defining an intriguing trade-off between pulse compression and energy throughput. With our Ti:sapphire laser of 12 mJ and 40 fs, we obtain an output pulse of energy up to 10 mJ and duration 9.4 fs FWHM with a nice, focusable spatial mode. This corresponds to a reliable terawatt ultrashort tabletop laser source, a necessary tool for probing the dynamics of plasmas in the relativistic intensity regime.

个人简介:He received M.Sc. in optics and Ph.D. in condensed matter physics from the Huazhong University of Science and Technology (China) in 2003 and 2006, respectively. He then took a permanent lecturing position at the department of physics in Southeast University since March 2007. In 2009 and 2010, he carried out a postdoctoral research at the Laboratoire d'Optique Appliquée, a mixed research unit of ENSTA, CNRS and École Polytechnique in France. His work involves the theoretical and experimental study of some fundamental yet “hot” topics in nonlinear optics. As of March 2011, he has published 16 papers in refereed journals such as PRL, Rapid Communications in PR series, and PRA/E. 

 

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