Abstract
For wavelengths in the ultraviolet and X-ray regime the start-up of the FEL process by seed radiation is not readily done due to the lack of suitable lasers. Seeding by a high harmonic of an optical laser is a widely discussed idea. The process of Self-Amplified Spontaneous Emission SASE permits the startup of lasing at an arbitrary wavelength, without the need of external radiation. The SASE mechanism was proposed and theoretically explored in the early 1980s [1, 2, 3, 4] but it took 20 years before it could be verified experimentally at visible and ultraviolet wavelengths.
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Schmüser, P., Dohlus, M., Dohlus, J. (2008). Self Amplified Spontaneous Emission. In: Ultraviolet and Soft X-Ray Free-Electron Lasers. Springer Tracts in Modern Physics, vol 229. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79572-8_7
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