Center for Relativistic Laser ScienceExplore the interaction between ultra-intense light and matter
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Research
Attosecond science
▪ Research overview
- Attosecond science is a branch of strong field physics revealing ultrafast phenomena in nature with an unprecedented temporal
- resolution. Chemical reactions that affect our daily life occur in the femtosecond (10-15 s) time scale, which can be time-resolved
- using a femtosecond laser. Attosecond (10-18 s) is the characteristic time scale for ultrafast electron dynamics in atoms, molecules
- and solids. The investigation on electron dynamics in atoms, molecules and plasma that leads to high harmonic generation (HHG), frustrated tunneling ionization (FTI) and relativistic surface harmonic generation would offer new opportunities. New coherent light sources can be developed through HHG in gas, FTI, and relativistic surface HHG. As the development of a new light source can bring various future applications,it is being actively investigated in research institutes around the world. Besides, the microscopic control of electron localization in molecules would allow chemical reactions to be controlled, which may bring a revolutionary advancement in medical and biological applications. The investigation on electron transition or ionization in solids and nanostructures may bring radical improvement in communications and computing. The attosecond science group has been devoted to understand and control ultrafast light-matter interactions, while actively pursuing their future applications.
Ultrafast phenomena and their characteristic time scale
▪ Research Interests
The attosecond science group has worked on topics in ultrafast optical science. We investigate ultrafast laser technology to generate ultra-intense and ultrashort laser pulses. A single-cycle and few-cycle laser pulses are routinely generated in our lab. We have recently developed a universal pulse characterization technique called TIPTOE (Tunneling ionization with a perturbation for the time-domain observation of an electric field). We are actively investigating research topics related with the TIPTOE method. In addition, we explore ultrafast phenomena in atom, molecule, solid, and nanostructures. Specific research topics are listed below.
Research interests of attosecond science group and representative publications
- ▪ Ultrashort Laser Technology
- · Pulse characterization technique: tunneling ionization with a perturbation for the time-domain observation of an electric-field (TIPTOE)
- Pulse compression technology
- Pulse shaping and synthesizer technology
- Space-time characterization of ultrashort laser pulse
- Pulse contrast measurement
▪ Investigation on Ultrafast Phenomena
· Relativistic surface harmonic generation
· High harmonic generation, attosecond pulse generation and their characterization
· Frustrated tunneling ionization
· Multiphoton and tunneling ionization
· Strong field plasmonics
▪ Major Research Results
· Generation of strong high-order harmonics by using two-color laser field, Physical Review Letter 94, 243901 (2005).
· Demonstration of the attosecond electron wave packet interferometry, Physical Review Letters 108, 093001 (2012).
· Resolving multiple molecular orbitals using 2D harmonic spectroscopy, Physical Review Letters 114, 153901 (2015).
· Invention of a universal pulse characterization technique (TIPTOE), Optica 5, 402 (2018).
· Discovery of a new coherent extreme ultraviolet (EUV) emission, Nature Photonics 12, 620-624 (2018).
▪ Research Group
Rectangular vacuum chamber for relativistic surface harmonic experiments using the 4-PW laser beam
Group members
Tel. +82-62-715-4703~4 / Fax. +82-62-715-4705
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