Advanced

Manifestation of anharmonic resonance in the interaction of intense ultrashort laser pulses with microstructured targets

Dalui, Malay LU ; Kundu, M.; Madhu Trivikram, T.; Ray, Krishanu and Krishnamurthy, M. (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.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics of Plasmas
volume
23
issue
10
publisher
American Institute of Physics
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
2017-01-01 08:37:30
@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>},
  articleno    = {103101},
  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},
  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},
  volume       = {23},
  year         = {2016},
}