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Free-Electron Laser FLASH (FLASH)



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FLASH, the Free-Electron LASer in Hamburg, started user operation in summer 2005 as the first free-electron laser for XUV and soft X-ray radiation. It is operated in the "self-amplified spontaneous emission" (SASE) mode and currently covers a wavelength range from 4 nm to about 52 nm in the first harmonic with GW peak power and pulse durations between 30 fs and 200 fs. FLASH1 offers four beamlines for users in the FLASH experimental hall 'Albert Einstein' (PG and BL beamlines).

In the past years, an additional FEL undulator line in a separate tunnel - FLASH2- and the new FLASH experimental hall 'Kai Siegbahn' have been built adjacent to the existing FLASH facility now called FLASH1. First lasing of FLASH2 was achieved in August 2014 in parallel to FLASH1. Now the FLASH facility at DESY comprises two separate and almost independent FEL sources. This upgrade enhances significantly the capacities for XUV and soft X-ray FEL users at DESY. FLASH2 will offer up to six experimental stations in the FLASH experimental hall 'Kai Siegbahn', in building 28k. Since spring 2016, the beamlines FL 24 and FL 26 are available for users. At FL 26 the permanent end station REMI, a reaction microscope from the MPIK Heidelberg, is set up.

XUV - Photons--
Number of Bunches per second+1 - 8000 (delivered up to 5000 to users)
Pulse Repetition Rates (within pulse train)+40, 50, 100, 200, 250, 500, 1000kHz
Wavelength4.2 - 52 (FL1) / 4 - 90 (FL2)nm
Photon Energy24 - 295 (FL1) / 14 - 310 (FL2)eV
Pulse Duration (FWHM)30 - 200 (FL1) / <10 - 200 (FL2)fs
Average Pulse Energy (single bunch)*1 - 500µJ
Average Pulse Energy (pulse trains)*1 - 200µJ
3rd Harmonic Wavelengthdown to 1.7nm
3rd Harmonic Pulse Energytypically 0.5 % of fundamental
THz-Photons (at FLASH1)
Wavelength+10 - 230µm
Photon Energy+5 - 125meV
Photon frequency+1.3 - 30THz
Average Pulse Energy*10 - 100µJ

+ Depends on wavelength required

* Depends on the pulse length and wavelength required, please consult with beamline contacts

Source: https://photon-science.desy.de/facilities/flash/flash_parameters/index_eng.html

More information:

Virtual 3D tour of FLASH

FLASH Facility

FLASH Beamtime Schedule

FLASH Beamlines

Calls & Deadlines

How to reach and FLASH


The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives

Faatz B, Braune M, Hensler O, Honkavaara K, Kammering R, Kuhlmann M, Ploenjes E, Roensch-Schulenburg J, Schneidmiller E, Schreiber S, Tiedtke K, Tischer M, Treusch R, Vogt M, Wurth W, Yurkov M, Zemella J - Applied Sciences - 2017

The free-electron laser FLASH

Schreiber S, Faatz B - High Power Laser Science and Engineering - 2015

Free-Electron Laser FLASH Logo

Free-Electron Laser FLASH Image

Helmholtz Imaging spinning wheel

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