visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2015-07-16 16:00 
연사  
장소 E6-2, 1318 

Next-generation ultrafast laser technology for nonlinear optics and strong-field physics

2015/7/16 (Thurs) 4PM, Rm 1318 (Faculty Conference Rm.)

Dr. Kyunghan Hong, MIT

 

Femtosecond high-power Ti:sapphire chirped-pulse amplification (CPA) laser technology at 800 nm of wavelength has been widely and almost exclusively used over last two decades for studying ultrafast nonlinear optics and strong-field phenomena. Recently ultrafast optical parametric chirped-pulse amplification (OPCPA) technology has made a rapid progress, so that various wavelengths are available at high intensities. The wavelength selectivity provides interesting opportunities in ultrafast nonlinear optics and strong-field phenomena driven especially at mid-infrared (MIR) wavelengths. High-harmonic generation (HHG) driven by MIR wavelengths has been proven to be a reliable way to achieve a tabletop coherent water-window soft X-ray (280-540 eV) or keV source. On the other hand, the super-continuum generation (SCG) in the MIR range is highly useful for detecting biomedical materials and air pollutants with the resonant fingerprints of the common molecules, such as H2O, CO2, CO, and NH4. The highly nonlinear laser filamentation process enables the SCG in bulk dielectrics and gases. 


In this presentation, I review our recent progress on a multi-mJ MIR (2.1 m) OPCPA system operating at a kHz repetition rate, pumped by a picosecond cryogenically cooled Yb:YAG laser. Using this novel MIR source, we demonstrate high-flux soft X-ray HHG up to the water-window range. In addition, I present the MIR filamentation in dielectrics showing 3-octave-spanning SCG and sub-2-cycle self-compression. I will also discuss novel high-energy pulse synthesizer technology based on multi-color OPCPA systems. The work presented here provides an excellent platform of next-generation strong-field laser technology.

 

Contact: HeeKyunh Ahn, Laser Science Research Lab. Tel. 2561

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
425 2022-10-06 13:00    Counting States with Global Symmetry
424 2022-08-12 10:00    Twisted Bilayer Magnets file
423 2022-08-12 10:00    Twisted Bilayer Magnets file
422 2016-04-26 16:00    Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
421 2018-05-11 16:00    암페어 단위 재정의와 단전자 펌프 소자 개발 file
420 2025-04-22 16:00  Dr. Nanse Esaki (The University of Tokyo)  Spin Nernst and thermal Hall effects of topological triplons in quantum dimer magnets on the maple-leaf and star lattices file
419 2016-06-01 10:30    Welcome to Nature Photonics
418 2018-07-02 15:00    High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
417 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
416 2018-11-09 14:30    Moiré superlattices – from twisted bilayer graphene to quasicrystal file
415 2024-05-30 10:00    Quasiperiodic Effects in Quasicrystals
414 2024-05-16 14:30    [Astrophysics Seminar] Observational Cosmology with Superconducting Sensors
413 2022-03-29 10:00    Non-reciprocal phase transitions file
412 2022-03-31 10:00    Weiss fields for Quantum Spin Dynamics file
411 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
410 2023-05-03 16:00    Probing microscopic origins of axions by the chiral magnetic effect
409 2022-11-09 16:00    Radio Astronomy, Radio Interferometry, and Multi-wavelength Studies on Relativistic Jets
408 2017-06-02 16:00    Maxwell's demon in quantum wonderland file
407 2015-12-03 16:00    Hybrid solid state spin qubits in wide bandgap semiconductors
406 2025-01-08 16:00  Dr. SangEun Han  Quantum impurity model for two-stage multipolar ordering and Fermi surface reconstruction