FEL2012 - List of Authors (Joly, N.Y.)

Paper

Title

Page

Seeding of SPARC-FEL with a Tunable Fibre-based Source

269

N.Y. Joly
University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany
S. Bielawski
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
W. Chang, P. Hölzer, K. Mak, P.St.J. Russell, F. Tani, J.C. Travers
Max Planck Institute for the Science of Light, Erlangen, Germany
F. Ciocci, L. Giannessi, A. Petralia, M. Quattromini
ENEA C.R. Frascati, Frascati (Roma), Italy
M.-E. Couprie, M. Labat, T. Tanikawa
SOLEIL, Gif-sur-Yvette, France
G. De Ninno, B. Mahieu
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
G. Gatti
INFN/LNF, Frascati (Roma), Italy
V. Petrillo
Istituto Nazionale di Fisica Nucleare, Milano, Italy
J.V. Rau
ISM-CNR, Rome, Italy

Instead of seeding a free electron laser in the UV-VUV with a frequency doubled or tripled laser or high order harmonics, here we investigate and present the first results on seeding SPARC-FEL with a fiber-based tunable ultraviolet source. The seed generation system consists of a kagomé hollow-core photonic crystal fiber filled with noble gas. Diffraction-limited DUV pulses of >50 nJ and fs-duration which are continuously tunable from below 200 nm to above 300 nm are generated. The process is based on soliton-effect self-compression of the pump pulse down to a few optical cycles, accompanied by the emission of a resonant dispersive wave in the DUV spectral region. The quality of the compression highly depends on the pump pulse duration, and ideally, pulses <60 fs should be used. Our experimental set-up and associated GENESIS simulations enable us to study the utility of the seed tunability, and the influence of the seed quality, on the performance of the SPARC-FEL in the 200-300 nm range.

FROBI01

Towards Compact Short FEL Sources : Seeding and LWFA based FEL

M. Labat, M.-E. Couprie, A. Loulergue
SOLEIL, Gif-sur-Yvette, France
S. Bielawski
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
G. De Ninno
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
L. Giannessi
ENEA C.R. Frascati, Frascati (Roma), Italy
N.Y. Joly
University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany
P.St.J. Russell
Max Planck Institute for the Science of Light, Erlangen, Germany

The seeding technique, proposed to improve the FEL temporal coherence and to enable more compact schemes, progressed significantly during this last decade. After conventionnal laser sources, eventually doubled or tripled in crystal, high order harmonics generated in gas were successfully used, bringing FELs in the XUV range. We are now involved in the demonstration of a new scheme, using fiber based tunable ultraviolet source. Its output power and tunability are of high interest. Last results obtained with the MaxPlanck Institute and the SPARC teams are presented. Seeding can lead to complex dynamics between the electron and the light pulse. Numerical studies revealed possible pulse splitting effects. We will report on their possible observation in collaboration with the FERMI team. Future FELs may also rely on emerging accelerators generated by laser wakefiled acceleration. Recently, the LUNEX5 project was proposed in France. It consists in one undulator line, fed by either a conventionnal LINAC or a laser wakefield accelerator (LWFA), to deliver XUV fs pulses to pilot user experiments. Preliminary work on radiation optimization of an FEL based on a LWFA will be also presented.

Paper	Title	Page
TUPD17	Seeding of SPARC-FEL with a Tunable Fibre-based Source	269
	N.Y. Joly University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany S. Bielawski PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France W. Chang, P. Hölzer, K. Mak, P.St.J. Russell, F. Tani, J.C. Travers Max Planck Institute for the Science of Light, Erlangen, Germany F. Ciocci, L. Giannessi, A. Petralia, M. Quattromini ENEA C.R. Frascati, Frascati (Roma), Italy M.-E. Couprie, M. Labat, T. Tanikawa SOLEIL, Gif-sur-Yvette, France G. De Ninno, B. Mahieu Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy G. Gatti INFN/LNF, Frascati (Roma), Italy V. Petrillo Istituto Nazionale di Fisica Nucleare, Milano, Italy J.V. Rau ISM-CNR, Rome, Italy
	Instead of seeding a free electron laser in the UV-VUV with a frequency doubled or tripled laser or high order harmonics, here we investigate and present the first results on seeding SPARC-FEL with a fiber-based tunable ultraviolet source. The seed generation system consists of a kagomé hollow-core photonic crystal fiber filled with noble gas. Diffraction-limited DUV pulses of >50 nJ and fs-duration which are continuously tunable from below 200 nm to above 300 nm are generated. The process is based on soliton-effect self-compression of the pump pulse down to a few optical cycles, accompanied by the emission of a resonant dispersive wave in the DUV spectral region. The quality of the compression highly depends on the pump pulse duration, and ideally, pulses <60 fs should be used. Our experimental set-up and associated GENESIS simulations enable us to study the utility of the seed tunability, and the influence of the seed quality, on the performance of the SPARC-FEL in the 200-300 nm range.

FROBI01	Towards Compact Short FEL Sources : Seeding and LWFA based FEL
	M. Labat, M.-E. Couprie, A. Loulergue SOLEIL, Gif-sur-Yvette, France S. Bielawski PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France G. De Ninno Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy L. Giannessi ENEA C.R. Frascati, Frascati (Roma), Italy N.Y. Joly University of Erlangen-Nuremberg, Erlangen-Nuremberg, Germany P.St.J. Russell Max Planck Institute for the Science of Light, Erlangen, Germany
	The seeding technique, proposed to improve the FEL temporal coherence and to enable more compact schemes, progressed significantly during this last decade. After conventionnal laser sources, eventually doubled or tripled in crystal, high order harmonics generated in gas were successfully used, bringing FELs in the XUV range. We are now involved in the demonstration of a new scheme, using fiber based tunable ultraviolet source. Its output power and tunability are of high interest. Last results obtained with the MaxPlanck Institute and the SPARC teams are presented. Seeding can lead to complex dynamics between the electron and the light pulse. Numerical studies revealed possible pulse splitting effects. We will report on their possible observation in collaboration with the FERMI team. Future FELs may also rely on emerging accelerators generated by laser wakefiled acceleration. Recently, the LUNEX5 project was proposed in France. It consists in one undulator line, fed by either a conventionnal LINAC or a laser wakefield accelerator (LWFA), to deliver XUV fs pulses to pilot user experiments. Preliminary work on radiation optimization of an FEL based on a LWFA will be also presented.