We report the first generation of coherent, tunable, variable-polarization, soft X-ray femtosecond pulses, generated by a seeded free-electron laser (FEL) operating in the fresh bunch, two-stage harmonic upshift configuration. Characterization of the radiation proves this FEL configuration can produce single-transverse-mode, narrow-spectral-bandwidth output pulses of several tens of microjoules energy and low pulse-to-pulse wavelength jitter at final wavelengths of 10.8 nm and below. The fresh bunch configuration enhances the FEL emission at high harmonic orders by avoiding a gain depression due to the energy spread induced by the first-stage FEL interaction. Coherent signals measured down to 4.3 nm suggest this configuration is directly scalable to photon energies that will enable scientific investigations below the carbon K-edge, including access to the L-edges of many magnetic materials, with an energy per pulse unlocking the gate for experiments in the soft X-ray region with close to Fourier-transform-limited pulses.
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Ben-Zvi, I., Yang, K. M. & Yu, L. H. The ‘fresh-bunch’ technique in FELs. Nucl. Instrum. Methods Phys. Res. A 318, 726–729 (1992).
Emma, P. et al. First lasing and operation of an angstrom-wavelength free-electron laser. Nature Photon. 4, 641–647 (2010).
Ishikawa, T. et al. A compact X-ray free-electron laser emitting in the sub-angstrom region. Nature Photon. 6, 540–544 (2012).
Ackermann, W. et al. Operation of a free-electron laser from the extreme ultraviolet to the water window. Nature Photon. 1, 336–342 (2007).
Feldhaus, J. FLASH, the first soft X-ray free electron laser (FEL) user facility. J. Phys. B 43, 194002 (2010).
McNeil, B. W. J. & Thompson, N. R. X-ray free-electron lasers. Nature Photon. 4, 814–821 (2010).
Madey, J. M. J. Stimulated emission of bremsstrahlung in a periodic magnetic field. J. Appl. Phys. 42, 1906–1913 (1971).
Kondratenko, A. M. & Saldin, E. L. Generation of coherent radiation by a relativistic electron beam in an undulator. Partic. Accel. 10, 207–216 (1980).
Sprangle, P., Tang, C.-M. & Manheimer, W. M. Nonlinear theory of free-electron lasers and efficiency enhancement. Phys. Rev. A 21, 302–318 (1980).
Haus, H. Noise in free-electron laser amplifier. IEEE J. Quantum Electron. 17, 1427–1435 (1981).
Dattoli, G., Marino, A., Renieri, A. & Romanelli, F. Progress in the Hamiltonian picture of the free electron laser. IEEE J. Quantum Electron. QE-17, 1371–1387 (1981).
Bonifacio, R., Pellegrini, C. & Narducci, L. M. Collective instabilities and high-gain regime in a free-electron laser. Opt. Commun. 50, 373–378 (1984).
Amann, J. et al. Demonstration of self-seeding in a hard X-ray free-electron laser. Nature Photon. 6, 693–698 (2012).
Geloni, G., Kocharyan, V. & Saldin, E. A novel self-seeding scheme for hard X-ray FELs. J. Mod. Opt. 58, 1391–1403 (2011).
Dimauro, L. et al. First SASE and seeded FEL lasing of the NSLS DUV FEL at 266 and 400 nm. Nucl. Instrum. Methods Phys. Res. A 507, 15–18 (2003).
Garzella, D. et al. Using VUV high-order harmonics generated in gas as a seed for a single pass FEL. Nucl. Instrum. Methods Phys. Res. A 528, 502–505 (2004).
Lambert, G. et al. Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light. Nature Phys. 4, 296–300 (2008).
Togashi, T. et al. Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser. Opt. Express 19, 317–324 (2011).
Boscolo, I. & Stagno, V. The converter and the transverse optical klystron. Il Nuovo Cimento B 58, 267–285 (1980).
Girard, B. et al. Optical frequency multiplication by an optical klystron. Phys. Rev. Lett. 53, 2405–2408 (1984).
Prazeres, R. et al. First production of vacuum-ultraviolet coherent light by frequency multiplication in a relativistic electron beam. Europhys. Lett. 4, 817–822 (1987).
Barbini, R. et al. 80-nm FEL design in an oscillator amplifier configuration. in Prospects for a 1 Å Free-Electron Laser Workshop (ed. Gallardo, J. C.) BNL-52273 (BNL, 1990).
Bonifacio, R., De Salvo Souza, L., Pierini, P. & Scharlemann, E. Generation of XUV light by resonant frequency tripling in a two-wiggler FEL amplifier. Nucl. Instrum. Methods Phys. Res. A 296, 787–790 (1990).
Yu, L. H. Generation of intense UV radiation by subharmonically seeded single-pass free-electron lasers. Phys. Rev. A 44, 5178 (1991).
Yu, L. H. et al. High-gain harmonic-generation free-electron laser. Science 289, 932–934 (2000).
Yu, L. H. et al. First ultraviolet high-gain harmonic-generation free-electron laser. Phys. Rev. Lett. 91, 074801 (2003).
Labat, M. et al. High-gain harmonic-generation free-electron laser seeded by harmonics generated in gas. Phys. Rev. Lett. 107, 224801 (2011).
Giannessi, L. et al. Superradiant cascade in a seeded free-electron laser. Phys. Rev. Lett. 110, 044801 (2013).
Allaria, E. et al. Tunability experiments at the FERMI@Elettra free-electron laser. New J. Phys. 14, 113009 (2012).
Allaria, E. et al. Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet. Nature Photon. 6, 699–704 (2012).
Liu, B. et al. Demonstration of a widely-tunable and fully-coherent high-gain harmonic-generation free-electron laser. Phys. Rev. Spec. Top. Accel. Beams 16, 020704 (2013).
Wu, J. & Yu, L. H. High gain harmonic generation X-ray free electron laser. Proceedings of the 2001 Particle Accelerator Conference WPPH108 (2001).
Brefeld, W. et al. Study of the frequency multiplication process in a multistage HGHG FEL. Nucl. Instrum. Methods Phys. Res. A 483, 80–88 (2002).
Saldin, E. L., Schneidmiller, E. A. & Yurkov, M. V. Study of a noise degradation of amplification process in a multistage HGHG FEL. Opt. Commun. 202, 169–187 (2002).
Yu, L.-H. & Ben-Zvi, I. High-gain harmonic generation of soft X-rays with the ‘fresh bunch’ technique. Nucl. Instrum. Methods Phys. Res. A 393, 96–99 (1997).
Bocchetta, C. J. et al. FERMI@Elettra FEL Conceptual Design Report (Sincrotrone Trieste, 2007).
Sasaki, S. Analyses for a planar variably-polarizing undulator. Nucl. Instrum. Methods Phys. Res. A 347, 83–86 (1994).
Wang, X. J. et al. Efficiency and spectrum enhancement in a tapered free-electron laser amplifier. Phys. Rev. Lett. 103, 154801 (2009).
Allaria, E. FEL commissioning at FERMI@Elettra. in 2011 FEL Conference WEOBl1 (2011).
Giannessi, L. et al. High-order-harmonic generation and superradiance in a seeded free-electron laser. Phys. Rev. Lett. 108, 164801 (2012).
De Ninno, G., Mahieu, B., Allaria, E., Giannessi, L. & Spampinati, S. Chirped seeded free-electron lasers: self-standing light sources for two-color pump-probe experiments. Phys. Rev. Lett. 110, 064801 (2013).
The authors thank the FERMI engineering, technician, control and operator teams for their continuous support during the installation and commissioning of the FEL. The resources that made possible the construction of FERMI were obtained and managed by G. Comelli, A. Franciosi and C. Rizzuto. The authors also acknowledge the contributions of S. Milton, project director (2007–2010), who oversaw the final definition of the machine parameters and its physical realization; the advice and support of the FERMI Machine and Scientific Advisory Committees and consultants M. Cornacchia, W. Barletta, S. Tazzari and S. Biedron; and, finally, assistance from numerous individuals from sister FEL labs. This work was funded by the FERMI project of Elettra-Sincrotrone Trieste, partially supported by the Ministry of University and Research (grant nos FIRB-RBAP045JF2 and FIRB-RBAP06AWK3).
The authors declare no competing financial interests.
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Allaria, E., Castronovo, D., Cinquegrana, P. et al. Two-stage seeded soft-X-ray free-electron laser. Nature Photon 7, 913–918 (2013). https://doi.org/10.1038/nphoton.2013.277
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