Manifestation of anharmonic resonance in the interaction of intense ultrashort laser pulses with microstructured targets
(2016) In Physics of Plasmas 23(10).- Abstract
Identification of the basic processes responsible for an efficient heating of intense laser produced plasmas is one of the important features of high intensity laser matter interaction studies. Collisionless absorption due to the anharmonicity in the self-consistent electrostatic potential of the plasma, known as anharmonic resonance (AHR), has been proposed to be a basic mechanism but a clear experimental demonstration is needed. Here, we show that microstructured targets enhance X-ray emission and the polarization dependence ascribes the enhancement to anharmonic resonance heating. It is found that p-polarized pulses of 5×1017 W/cm2 intensity bring in a 16-fold enhancement in the X-ray emission in the energy range 20-350... (More)
Identification of the basic processes responsible for an efficient heating of intense laser produced plasmas is one of the important features of high intensity laser matter interaction studies. Collisionless absorption due to the anharmonicity in the self-consistent electrostatic potential of the plasma, known as anharmonic resonance (AHR), has been proposed to be a basic mechanism but a clear experimental demonstration is needed. Here, we show that microstructured targets enhance X-ray emission and the polarization dependence ascribes the enhancement to anharmonic resonance heating. It is found that p-polarized pulses of 5×1017 W/cm2 intensity bring in a 16-fold enhancement in the X-ray emission in the energy range 20-350 keV compared to s-polarized pulses with microstructured targets. This ratio is 2 for the case of polished targets under otherwise identical conditions. Particle-in-cell simulations clearly show that AHR is the key absorption mechanism responsible for this effect.
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- author
- Dalui, Malay LU ; Kundu, M. ; Madhu Trivikram, T. ; Ray, Krishanu and Krishnamurthy, M.
- organization
- publishing date
- 2016-10-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physics of Plasmas
- volume
- 23
- issue
- 10
- article number
- 103101
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- scopus:84989880259
- wos:000387445500078
- ISSN
- 1070-664X
- DOI
- 10.1063/1.4963849
- language
- English
- LU publication?
- yes
- id
- 62f60fd1-af6a-4587-a982-7f8bddd619c0
- date added to LUP
- 2016-10-25 09:42:46
- date last changed
- 2024-05-17 14:35:03
@article{62f60fd1-af6a-4587-a982-7f8bddd619c0,
abstract = {{<p>Identification of the basic processes responsible for an efficient heating of intense laser produced plasmas is one of the important features of high intensity laser matter interaction studies. Collisionless absorption due to the anharmonicity in the self-consistent electrostatic potential of the plasma, known as anharmonic resonance (AHR), has been proposed to be a basic mechanism but a clear experimental demonstration is needed. Here, we show that microstructured targets enhance X-ray emission and the polarization dependence ascribes the enhancement to anharmonic resonance heating. It is found that p-polarized pulses of 5×1017 W/cm<sup>2</sup> intensity bring in a 16-fold enhancement in the X-ray emission in the energy range 20-350 keV compared to s-polarized pulses with microstructured targets. This ratio is 2 for the case of polished targets under otherwise identical conditions. Particle-in-cell simulations clearly show that AHR is the key absorption mechanism responsible for this effect.</p>}},
author = {{Dalui, Malay and Kundu, M. and Madhu Trivikram, T. and Ray, Krishanu and Krishnamurthy, M.}},
issn = {{1070-664X}},
language = {{eng}},
month = {{10}},
number = {{10}},
publisher = {{American Institute of Physics (AIP)}},
series = {{Physics of Plasmas}},
title = {{Manifestation of anharmonic resonance in the interaction of intense ultrashort laser pulses with microstructured targets}},
url = {{http://dx.doi.org/10.1063/1.4963849}},
doi = {{10.1063/1.4963849}},
volume = {{23}},
year = {{2016}},
}