Photon Engineering and Time-Resolved Photoemission Platforms at NSRRC: From Picoseconds to Femtoseconds

Ping-Hui Lin^1,2*, Ming-Chang Chen^3,1, Chia-Hao Chen¹, Cheng-Maw Cheng¹, Chih-Wei Luo^4,1

¹National Synchrotron Radiation Research Center, Hsinchu, Taiwan
²Department of Physics, National Taiwan Normal University, Taipei, Taiwan
³Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, Taiwan
⁴Department of Electrophysics and Institute of Physics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan

* Presenter:Ping-Hui Lin, email:lin.pinghui@ntnu.edu.tw

Recent efforts at the National Synchrotron Radiation Research Center (NSRRC, Taiwan) have focused on developing advanced photon-driven tools to bridge synchrotron and laser-based ultrafast spectroscopies. Two key systems are now operational: (1) a soft-X-ray time-resolved photoemission (Tr-PES) beamline at TPS-43A1 that synchronizes femtosecond laser excitation with 25-ps synchrotron pulses for pump-probe studies of dynamic electronic and chemical processes, (2) a dual-Yb-laser HHG-EUV Tr-ARPES station delivering 30 fs, 33–70 eV probe pulses with 10¹¹ photons/s flux and 180 meV energy resolution. (3) A second-generation 80 W Yb:KGW Tr-ARPES facility is being commissioned, incorporating the patented CASCADE post-compression technique to generate single-cycle (≈3 fs) pulses and circularly-polarized HHG beams for spin- and symmetry-sensitive ultrafast studies. Together, these systems establish NSRRC as a regional hub for photon engineering and ultrafast spectroscopy, enabling collaborative investigations of quantum materials under both equilibrium and driven conditions.

Keywords: Time-resolved , ARPES, PES, NSRRC