Imitating the effect of amplified spontaneous emission pedestal at relativistically intense laser interaction with nanostructured solid targets
| Autor: | Yu. V. Nazarkina, K.A. Ivanov, Yu. V. Kargina, I. V. Bozhev, Andrei B Savel'ev, Sergey Gavrilov, Roman V Volkov, V. Yu. Timoshenko, I. M. Gavrilin, N. S. Sukhanov |
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| Rok vydání: | 2020 |
| Předmět: |
Amplified spontaneous emission
Materials science Physics and Astronomy (miscellaneous) Substrate (electronics) Radiation Laser 01 natural sciences Fluence Molecular physics law.invention 010309 optics Pedestal law 0103 physical sciences 010306 general physics Absorption (electromagnetic radiation) Instrumentation Intensity (heat transfer) |
| Zdroj: | Laser Physics Letters. 17:045302 |
| ISSN: | 1612-202X 1612-2011 |
| DOI: | 10.1088/1612-202x/ab7371 |
| Popis: | We investigated the effect of focusing sub-nanosecond laser radiation with varied fluence onto the surface of different flat and nanostructured targets utilized in ultra-high intensity laser-plasma experiments. Thus, we modeled the action of the prepulse, referred to as an amplified spontaneous emission pedestal, typically present for a relativistic (with peak intensity over 1018 W cm−2) laser pulse with naturally limited contrast. The suppressed melting threshold was detected for the sub-wavelength scale structured material. Local melting leading to distortion of initial structures was detected at a fluence of ~0.2 J cm−2 and below, or 3–5 times lower compared to the flat substrate melting threshold. It is also demonstrated that the threshold lowering is dependent on the production method of the structures, which may be attributed to increased absorption and suppressed heat transfer into the bulk. |
| Databáze: | OpenAIRE |
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