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Past Events
Attosecond Optical Spectroscopy: A Brief Historical Development and Future Opportunities
| Speaker: | Dr. Tran Trung Luu |
| Affiliation: | Ultrafast Spectroscopy and Attosecond Science, ETH Zurich, Switzerland |
| Date: | January 29, 2019 (Tuesday) |
| Time: | 4:00 p.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, HKU |
Abstract
Investigation of electronic dynamics in its native time scale requires tool that possesses comparable or shorter temporal confinement. In this talk, we will briefly review the historical development of attosecond science (1 attosecond = 1 as = 10-18 seconds). Being fueled by the Chirped Pulse Amplification, the technology being honored by the Nobel Physics prize 2018, intense light – matter interaction had been pushed to a new paradigm where attosecond electronic dynamics could be probed in real time. We will show how the fastest optical light pulses, electromagnetic pulses with the carrier wavelength in the visible range, whose duration is confined to ~ 400 as, are created and measured. In addition, ultrashort laser pulses not only brought attosecond spectroscopy to the gas phase but also to the condensed phase. Coherent, intense extreme ultraviolet radiation is created from intense laser – solid interaction and it may serve as a new tool to optically study the bandstructure of solids. This new tool opened avenues for applied applications of extreme ultraviolet radiation and also a tremendous opportunity for studying the electronic structure and dynamics of condensed matter.
Anyone interested is welcome to attend.