Generation of coherent 19- and 38-nm radiation at a free-electron laser directly seeded at 38 nm
(2013) In Physical Review Letters 111(11).- Abstract
Initiating the gain process in a free-electron laser (FEL) from an external highly coherent source of radiation is a promising way to improve the pulse properties such as temporal coherence and synchronization performance in time-resolved pump-probe experiments at FEL facilities, but this so-called "seeding" suffers from the lack of adequate sources at short wavelengths. We report on the first successful seeding at a wavelength as short as 38.2 nm, resulting in GW-level, coherent FEL radiation pulses at this wavelength as well as significant second harmonic emission at 19.1 nm. The external seed pulses are about 1 order of magnitude shorter compared to previous experiments allowing an ultimate time resolution for the investigation of... (More)
Initiating the gain process in a free-electron laser (FEL) from an external highly coherent source of radiation is a promising way to improve the pulse properties such as temporal coherence and synchronization performance in time-resolved pump-probe experiments at FEL facilities, but this so-called "seeding" suffers from the lack of adequate sources at short wavelengths. We report on the first successful seeding at a wavelength as short as 38.2 nm, resulting in GW-level, coherent FEL radiation pulses at this wavelength as well as significant second harmonic emission at 19.1 nm. The external seed pulses are about 1 order of magnitude shorter compared to previous experiments allowing an ultimate time resolution for the investigation of dynamic processes enabling breakthroughs in ultrafast science with FELs. The seeding pulse is the 21st harmonic of an 800-nm, 15-fs (rms) laser pulse generated in an argon medium. Methods for finding the overlap of seed pulses with electron bunches in spatial, longitudinal, and spectral dimensions are discussed and results are presented. The experiment was conducted at FLASH, the FEL user facility at DESY in Hamburg, Germany.
(Less)
- author
- publishing date
- 2013-09-09
- type
- Contribution to journal
- publication status
- published
- in
- Physical Review Letters
- volume
- 111
- issue
- 11
- article number
- 114801
- publisher
- American Physical Society
- external identifiers
-
- scopus:84880712413
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.111.114801
- language
- English
- LU publication?
- no
- id
- 0fd7c6d8-3620-469c-a6e9-51c661c8e2df
- date added to LUP
- 2019-05-10 18:03:27
- date last changed
- 2023-11-18 21:30:20
@article{0fd7c6d8-3620-469c-a6e9-51c661c8e2df, abstract = {{<p>Initiating the gain process in a free-electron laser (FEL) from an external highly coherent source of radiation is a promising way to improve the pulse properties such as temporal coherence and synchronization performance in time-resolved pump-probe experiments at FEL facilities, but this so-called "seeding" suffers from the lack of adequate sources at short wavelengths. We report on the first successful seeding at a wavelength as short as 38.2 nm, resulting in GW-level, coherent FEL radiation pulses at this wavelength as well as significant second harmonic emission at 19.1 nm. The external seed pulses are about 1 order of magnitude shorter compared to previous experiments allowing an ultimate time resolution for the investigation of dynamic processes enabling breakthroughs in ultrafast science with FELs. The seeding pulse is the 21st harmonic of an 800-nm, 15-fs (rms) laser pulse generated in an argon medium. Methods for finding the overlap of seed pulses with electron bunches in spatial, longitudinal, and spectral dimensions are discussed and results are presented. The experiment was conducted at FLASH, the FEL user facility at DESY in Hamburg, Germany.</p>}}, author = {{Ackermann, S. and Azima, A. and Bajt, S. and Bödewadt, J. and Curbis, F. and Dachraoui, H. and Delsim-Hashemi, H. and Drescher, M. and Düsterer, S. and Faatz, B. and Felber, M. and Feldhaus, J. and Hass, E. and Hipp, U. and Honkavaara, K. and Ischebeck, R. and Khan, S. and Laarmann, T. and Lechner, C. and Maltezopoulos, Th and Miltchev, V. and Mittenzwey, M. and Rehders, M. and Rönsch-Schulenburg, J. and Rossbach, J. and Schlarb, H. and Schreiber, S. and Schroedter, L. and Schulz, M. and Schulz, S. and Tarkeshian, R. and Tischer, M. and Wacker, V. and Wieland, M.}}, issn = {{0031-9007}}, language = {{eng}}, month = {{09}}, number = {{11}}, publisher = {{American Physical Society}}, series = {{Physical Review Letters}}, title = {{Generation of coherent 19- and 38-nm radiation at a free-electron laser directly seeded at 38 nm}}, url = {{http://dx.doi.org/10.1103/PhysRevLett.111.114801}}, doi = {{10.1103/PhysRevLett.111.114801}}, volume = {{111}}, year = {{2013}}, }