Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser.

The 13th harmonic of a Ti:sapphire (Ti:S) laser in the plateau region was injected as a seeding source to a 250-MeV free-electron-laser (FEL) amplifier. When the amplification conditions were fulfilled, strong enhancement of the radiation intensity by a factor of 650 was observed. The random and uncontrollable spikes, which appeared in the spectra of the Self-Amplified Spontaneous Emission (SASE) based FEL radiation without the seeding source, were found to be suppressed drastically to form to a narrow-band, single peak profile at 61.2 nm. The properties of the seeded FEL radiation were well reproduced by numerical simulations. We discuss the future precept of the seeded FEL scheme to the shorter wavelength region.

[1]  A. M. Kondratenko,et al.  GENERATING OF COHERENT RADIATION BY A RELATIVISTIC ELECTRON BEAM IN AN ONDULATOR , 1980 .

[2]  Claudio Pellegrini,et al.  Collective instabilities and high-gain regime in a free electron laser , 1984 .

[3]  Kim.  Three-dimensional analysis of coherent amplification and self-amplified spontaneous emission in free-electron lasers. , 1986, Physical review letters.

[4]  Schafer,et al.  Calculation of photoemission from atoms subject to intense laser fields. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[5]  Pellegrini,et al.  Spectrum, temporal structure, and fluctuations in a high-gain free-electron laser starting from noise. , 1994, Physical review letters.

[6]  Ferenc Krausz,et al.  Generation of Coherent X-rays in the Water Window Using 5-Femtosecond Laser Pulses , 1997 .

[7]  J. Miao,et al.  Extending the methodology of X-ray crystallography to allow imaging of micrometre-sized non-crystalline specimens , 1999, Nature.

[8]  J. Hajdu,et al.  Potential for biomolecular imaging with femtosecond X-ray pulses , 2000, Nature.

[9]  Solomon,et al.  High-gain harmonic-generation free-electron laser , 2000, Science.

[10]  Zenghu Chang,et al.  Dramatic extension of the high-order harmonic cutoff by using a long-wavelength driving field , 2001 .

[11]  E. Takahashi,et al.  Generation of highly coherent submicrojoule soft x rays by high-order harmonics , 2002 .

[12]  H. Wabnitz,et al.  Multiple ionization of atom clusters by intense soft X-rays from a free-electron laser , 2002, Nature.

[13]  Katsumi Midorikawa,et al.  Generation of 10- microJ coherent extreme-ultraviolet light by use of high-order harmonics. , 2002, Optics letters.

[14]  Eric M. Gullikson,et al.  Coherent Soft X-ray Generation in the Water Window with Quasi-Phase Matching , 2003, Science.

[15]  H. Hasegawa,et al.  High-throughput, high-damage-threshold broadband beam splitter for high-order harmonics , 2004, InternationalQuantum Electronics Conference, 2004. (IQEC)..

[16]  F. Krausz,et al.  Generation of coherent soft-X-ray radiation extending far beyond the titanium L edge. , 2004, Physical review letters.

[17]  Takashi Tanaka.  FEL SIMULATION CODE FOR UNDULATOR PERFORMANCE ESTIMATION , 2004 .

[18]  E. Takahashi,et al.  Low-divergence coherent soft x-ray source at 13 nm by high-order harmonics , 2004 .

[19]  Shunji Goto,et al.  PHOTON OPTICS AT SCSS , 2006 .

[20]  I. Christov,et al.  Harnessing Attosecond Science in the Quest for Coherent X-rays , 2007, Science.

[21]  F. Krausz,et al.  Coherent superposition of laser-driven soft-X-ray harmonics from successive sources , 2007 .

[22]  Ryszard S. Romaniuk,et al.  Operation of a free-electron laser from the extreme ultraviolet to the water window , 2007 .

[23]  F. Krausz.  Attosecond Physics , 2007, 2007 Conference on Lasers and Electro-Optics - Pacific Rim.

[24]  H. N. Chapman,et al.  Imaging Atomic Structure and Dynamics with Ultrafast X-ray Scattering , 2007, Science.

[25]  Tsumoru Shintake,et al.  CeB 6 electron gun for low-emittance injector , 2007 .

[26]  Chao Zhang,et al.  A compact free-electron laser for generating coherent radiation in the extreme ultraviolet region , 2008 .

[27]  E. Takahashi,et al.  Coherent water window x ray by phase-matched high-order harmonic generation in neutral media. , 2008, Physical review letters.

[28]  David Garzella,et al.  Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light , 2008 .

[29]  E. Takahashi,et al.  Generation of a coherent x ray in the water window region at 1 kHz repetition rate using a mid-infrared pump source. , 2009, Optics letters.

[30]  D. Garzella,et al.  Seed level requirement for improving the temporal coherence of a Free-Electron Laser , 2009 .

[31]  Hirotada Ohashi,et al.  Pulse energy of the extreme-ultraviolet free-electron laser at SPring-8 determined using a cryogenic radiometer , 2009 .

[32]  I. Christov,et al.  Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum , 2009, Proceedings of the National Academy of Sciences.

[33]  D. Ratner,et al.  First lasing and operation of an ångstrom-wavelength free-electron laser , 2010 .

[34]  S. T. Pratt,et al.  Femtosecond electronic response of atoms to ultra-intense X-rays , 2010, Nature.

[35]  High-order harmonic generation by an ultrafast infrared pulse , 2010 .