Enhanced relativistic harmonics by electron nanobunching
| Autor: | D. an der Brügge, Alexander Pukhov |
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| Rok vydání: | 2010 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1002.3576 |
| Popis: | It is shown that when an few-cycle, relativistically intense, p-polarized laser pulse is obliquely incident on overdense plasma, the surface electrons may form ultra-thin, highly compressed layers, with a width of a few nanometers. These electron "nanobunches" emit synchrotron radiation coherently. We calculate the one-dimensional synchrotron spectrum analytically and obtain a slowly decaying power-law with an exponent of 4/3 or 6/5. This is much flatter than the 8/3 power of the BGP (Baeva-Gordienko-Pukhov) spectrum, produced by a relativistically oscillating bulk skin layer. The synchrotron spectrum cut-off frequency is defined either by the electron relativistic $\gamma$-factor, or by the thickness of the emitting layer. In the numerically demonstrated, locally optimal case, the radiation is emitted in the form of a single attosecond pulse, which contains almost the entire energy of the full optical cycle. Comment: to appear in Physics of Plasmas |
| Databáze: | OpenAIRE |
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