Author: Dai, D.X.
Paper Title Page
Status of Dalian Coherent Light Source  
  • W.Q. Zhang, D.X. Dai, G.L. Wang, G.R. Wu, X.M. Yang
    DICP, Dalian, People's Republic of China
  • S. Chen, C. Feng, D. Wang, M. Zhang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  Funding: DCLS is a joint project of Dalian Institute of Chemical Physics (DICP) and Shanghai Institute of Applied Physics (SINAP), CAS. It is supported by National Natural Science Foundation of China (21127902)
A Free Electron Laser with high brightness, ultrafast laser pulses in the vacuum ultraviolet (VUV) wavelength region is an ideal light source for excitation of valence electrons and ionization of molecular systems with very high efficiency. it is quite helpful for studies of important dynamic processes in physical, chemical and biological systems. Dalian Coherent Light Source (DCLS) plans to deliver optical beam from 50-150nm in picoseconds or 100 femtoseconds for such research. High gain harmonic generation is the perfect choice in VUV FEL for narrow bandwidth, stable power and low cost due to fewer undulators. After eight months of installation and machine commissioning, a 300-MeV electron beam was achieved with peak current of more than 300A, and the emittance was less than 1.5 mm.mrad. The FEL power for individual pulse at 133nm approached more than 200uJ with 266nm seed laser on Jan. 2017. The gain curve and spectrum of HGHG & SASE FEL was measured, and tapering undulator helps increase the power by almost 100% when the FEL output saturated. The user experiment will start on June 2017. It is open for good proposals from the whole world.
The Photoinjector and Seed Laser Systems of DCLS  
  • G.R. Wu, D.X. Dai, G.L. Wang, X.M. Yang, W.Q. Zhang
    DICP, Dalian, People's Republic of China
  DCLS is free electron laser user facility based on HGHG concept. Two ultrafast laser systems are involved: the photoinjector laser system (PIL) and seed laser system (SL). Both laser systems have been installed and taken part in the commissioning of DCLS since September, 2016. Both laser systems are based on an all-CW-diode-pumped Ti:Sapphire amplifier system. PIL includes a delay-line type third harmonic generation scheme, a direct 3D shaping setup, and an imaging-relay transportation system. SL has two operation modes: 1 ps and 100 fs. It can be switched between these two modes. For the 100 fs mode, a delay-line based THG box is installed which delivers either 400 or 267 nm laser pulse as the seed. As for the 1 ps mode, a ps-OPA is used to deliver seed laser pulse with a wavelength between 240 and 360 nm. In this paper, we report the detailed design and the current status of these two laser systems.