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Dr. Guoqian Liao
Central Laser Facility, STFC Rutherford Appleton Laboratory, UK
Guoqian Liao is currently a postdoctoral researcher at the Central Laser Facility, STFC Rutherford Appleton Laboratory, UK. He got his BS degree from Huazhong University of Science and Technology (HUST) in 2011 and Ph.D. degree from the Institute of Physics, Chinese Academy of Sciences in 2016. He worked as a postdoc at Shanghai Jiao Tong University from 2016 to 2018 under the support from the National Postdoctoral Program for Innovative Talents. His research interests include intense terahertz (THz) sources, THz applications, and laser–plasma interactions.
Visiting dates: 2019-06-03 - 2019-06-13 Office No: TBD E-mail:
Inviter: Yutong Li
Contact Person: Liu Yang   Contact Number: 9907
Talk Title: High-power laser-driven terahertz bursts: Generation, manipulation and potential applications
Talk Place: M253
Talk Time: 6-Jun-2019 10:00 am
An ever-increasing number of strong-field applications like ultrafast coherent control over matter require tunable high-power pumping light pulses. The realization of such a source in the terahertz (THz) band has long been a formidable challenge. The combination of the readily available ultra-intense lasers and damage-free plasma medium makes relativistic laser-plasma interactions be a promising approach toward generating strong THz radiation. In this talk, we will report on the efficient generation of spectrally-tunable THz pulses with energies up to tens of millijoules, by using a high-intensity ps laser pulse to irradiate a metal foil. An analytical model is developed to elucidate the underlying THz generation scenarios, based on which the THz radiation is employed to diagnose the electron emission and ion acceleration from the target rear surface. In addition, some preliminary results of applying such a strong THz pulse to semiconductors will also be presented.

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