Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light Export

@article{NPhys2008GLambert, abstract = {Conventional synchrotron radiation sources enable the structure of matter to be studied at near-atomic spatial resolution and picosecond temporal resolution. Free-electron lasers promise to extend this down to femtosecond timescales. The process by which free-electron lasers amplify synchrotron light—known as self-amplified spontaneous emission1, 2, 3—is only partially temporally coherent, but this can be improved by seeding it with an external laser4, 5. Here we explore the use of seed light produced by high-order harmonic generation in a gas6, 7, 8, 9, covering wavelengths from the ultraviolet to soft X-rays. Using the SPring-8 Compact SASE Source test accelerator10, 11, 12, we demonstrate an increase of three orders of magnitude in the intensity of the fundamental radiation at 160 nm, halving of the free-electron laser saturation length, and the generation of nonlinear harmonics13 at 54 nm and 32 nm. The low seed level used in this demonstration suggests that nonlinear harmonic schemes should enable the generation of fully coherent soft X-rays at wavelengths down to the so-called 'water window', vital for the study of biological samples.}, author = {Lambert, G. and Hara, T. and Garzella, D. and Tanikawa, T. and Labat, M. and Carre, B. and Kitamura, H. and Shintake, T. and Bougeard, M. and Inoue, S. and Tanaka, Y. and Salieres, P. and Merdji, H. and Chubar, O. and Gobert, O. and Tahara, K. and Couprie, M. E.}, citeulike-article-id = {2619374}, citeulike-linkout-0 = {http://dx.doi.org/10.1038/nphys889}, citeulike-linkout-1 = {http://dx.doi.org/10.1038/nphys889}, doi = {10.1038/nphys889}, journal = {Nat Phys}, keywords = {fel, hhg, xuv}, month = {April}, number = {4}, pages = {296--300}, posted-at = {2008-10-13 21:31:09}, priority = {2}, publisher = {Nature Publishing Group}, title = {Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light}, url = {http://dx.doi.org/10.1038/nphys889}, volume = {4}, year = {2008} }

TY - JOUR ID - NPhys2008GLambert L3 - citeulike-article-id:2619374 N2 - Conventional synchrotron radiation sources enable the structure of matter to be studied at near-atomic spatial resolution and picosecond temporal resolution. Free-electron lasers promise to extend this down to femtosecond timescales. The process by which free-electron lasers amplify synchrotron light—known as self-amplified spontaneous emission1, 2, 3—is only partially temporally coherent, but this can be improved by seeding it with an external laser4, 5. Here we explore the use of seed light produced by high-order harmonic generation in a gas6, 7, 8, 9, covering wavelengths from the ultraviolet to soft X-rays. Using the SPring-8 Compact SASE Source test accelerator10, 11, 12, we demonstrate an increase of three orders of magnitude in the intensity of the fundamental radiation at 160 nm, halving of the free-electron laser saturation length, and the generation of nonlinear harmonics13 at 54 nm and 32 nm. The low seed level used in this demonstration suggests that nonlinear harmonic schemes should enable the generation of fully coherent soft X-rays at wavelengths down to the so-called 'water window', vital for the study of biological samples. IS - 4 JF - Nat Phys EP - 300 TI - Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light PB - Nature Publishing Group VL - 4 SP - 296 KW - fel KW - hhg KW - xuv AU - Lambert, G AU - Hara, T AU - Garzella, D AU - Tanikawa, T AU - Labat, M AU - Carre, B AU - Kitamura, H AU - Shintake, T AU - Bougeard, M AU - Inoue, S AU - Tanaka, Y AU - Salieres, P AU - Merdji, H AU - Chubar, O AU - Gobert, O AU - Tahara, K AU - Couprie, ME PY - 2008/04// UR - http://dx.doi.org/10.1038/nphys889 ER -