Abstract
For wavelengths in the extreme ultraviolet and X-ray regime the start-up of the FEL process by seed radiation is hampered by the lack of lasers with the desired wavelength. Seeding by a high harmonic of an optical or infrared laser is a possibility which has been realized in recent years, see Sect. 7.4, where also other seeding schemes are described. The process of Self-Amplified Spontaneous Emission (SASE) permits the start-up of lasing at an arbitrary wavelength, without the need of external radiation.
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Notes
- 1.
Transition radiation is produced when relativistic particles cross the boundary between two media of different refractive indices. The radiation emitted in backward direction is in the visible and infrared range. Optical transition radiation (OTR) is frequently applied at electron accelerators to obtain images of the beam cross section, see Sect. 8.9. The radiation is usually incoherent because in most cases the bunch is much longer than the optical wavelength. Coherent optical transition radiation with a much increased intensity will be generated if the bunch possesses a periodic density modulation with the period being equal to the optical wavelength.
References
A.M. Kondratenko, E.L. Saldin, Generation of coherent radiation by a relativistic electron beam in an ondulator. Part. Accel. 10, 207 (1980)
R. Bonifacio, C. Pellegrini, L.M. Narducci, Collective instabilities and high-gain regime in a free electron laser. Opt. Comm. 50, 373 (1984)
K.-J. Kim, Three-dimensional analysis of coherent amplification and self-amplified spontaneous emission in free-electron lasers Phys. Rev. Lett. 57, 1871 (1986)
K.-J. Kim, An analysis of self-amplified spontaneous emission. Nucl. Instrum. Meth. A 250, 396 (1986)
Z. Huang, K.-J. Kim, Review of x-ray free-electron laser theory. Phys. Rev. ST Accel. Beams 10, 034801 (2007)
M. Hogan et al., Measurements of high gain and intensity fluctuations in a SASE free-electron laser. Phys. Rev. Lett. 80, 289 (1998)
M. Hogan et al., Measurements of gain larger than \(10^5\) at \(12\,\mu \)m in a self amplified spontaneous-emission free-electron laser. Phys. Rev. Lett. 81, 4867 (1998)
S.V. Milton et al., Exponential gain and saturation of a self-amplified spontaneous emission free-electron laser. Science 292, 2037 (2001)
A.H. Lumpkin et al., Evidence for microbunching sidebands in a saturated free-electron laser using coherent optical transition radiation. Phys. Rev. Lett. 88, 234801 (2002)
J. Andruszkow et al., First observation of self-amplified spontaneous emission in a free-electron laser at 109 nm wavelength. Phys. Rev. Lett. 85, 3825 (2000)
V. Ayvazyan et al., Generation of GW radiation pulses from a VUV free-electron laser operating in the femtosecond regime. Phys. Rev. Lett. 88, 104802 (2002)
V. Ayvazyan et al., A new powerful source for VUV radiation: demonstration of exponential growth and saturation at the TTF free-electron laser. Eur. Phys. J. D 20, 149 (2002)
W. Ackermann et al., Operation of a free-electron laser from the extreme ultraviolet to the water window. Nat. Photonics 1, 339 (2007)
V. Ayvazyan et al., First operation of a free-electron laser generating GW power radiation at 32 nm wavelength. Eur. Phys. J. D 37, 297 (2006)
A. Tremaine et al., Experimental characterization of nonlinear harmonic radiation from a visible self-amplified spontaneous emission free-electron laser at saturation. Phys. Rev. Lett. 88, 204801 (2002)
L. DiMauro et al., First SASE and seeded FEL lasing of the NSLS DUV FEL at 266 and 400 nm. Nucl. Instr. Meth. A 507, 15 (2003)
T. Shintake, in Status of Japanese XFEL project and SSCS test accelerator, invited paper. FEL Conference, Berlin (2006)
R. Ischebeck, Transverse coherence of a VUV free electron laser, Ph. D. Thesis, University of Hamburg 2003, DESY-Thesis-2003-033
R. Ischebeck et al., Study of the transverse coherence at the TTF free electron laser. Nucl. Instr. Meth. A 507, 175 (2003)
C. Behrens et al., Constraints on photon pulse duration from longitudinal electron beam diagnostics at a soft x-ray free-electron laser. Phys. Rev. ST Acc. Beams 15, 030707 (2012)
K.-J. Kim, Z. Huang, R. Lindberg, in Principles of Free Electron Lasers. Lecture Notes, US Particle Accelerator School (to be published)
M.V. Klein, T.E. Furtak, Optik (Springer, Heidelberg, 1988)
E.L. Saldin, E.A. Schneidmiller, M.V. Yurkov, The Physics of Free Electron Lasers (Springer, Heidelberg, 2000)
A. Murokh et al., Properties of the ultrashort gain length, self-amplified spontaneous emission free-electron laser in the linear regime and saturation. Phys. Rev. E 67, 066501 (2003)
A. Tremaine et al., Fundamental and harmonic microbunching in a high-gain self-amplified spontaneous-emission free-electron laser. Phys. Rev. E 66, 036503 (2002)
G. Lambert et al., Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light. Nat. Phys. 4, 296 (2008)
T. Togashi et al., Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser. Opt. Express 19, 317 (2011)
S. Ackermann et al., Observation of coherent 19 nm and 38 nm radiation at a free-electron laser directly seeded at 38 nm. Phys. Rev. Lett. 111, 114801 (2013)
L.-H. Yu et al., First ultraviolet high-gain harmonic-generation free-electron laser. Phys. Rev. Lett. 91, 074801 (2003)
E. Allaria et al., Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet. Nat. Photonics 6, 699 (Oct. 2012)
G. Stupakov, Using the beam-echo effect for generation of short-wavelength radiation. Phys. Rev. Lett. 102, 074801 (2009)
D. Xiang, G. Stupakov, Echo-enabled harmonic generation free electron laser. Phys. Rev. ST Accel. Beams 12, 030702 (2009)
D. Xiang et al., Demonstration of the echo-enabled harmonic generation technique for short-wavelength seeded free electron lasers. Phys. Rev. Lett. 105, 114801 (2010)
Z.T. Zhao et al., First lasing of an echo-enabled harmonic generation free-electron laser. Nat. Photonics 6, 360 (2012)
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Schmüser, P., Dohlus, M., Rossbach, J., Behrens, C. (2014). Self-Amplified Spontaneous Emission and FEL Seeding. In: Free-Electron Lasers in the Ultraviolet and X-Ray Regime. Springer Tracts in Modern Physics, vol 258. Springer, Cham. https://doi.org/10.1007/978-3-319-04081-3_7
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