X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma
Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying p...
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creator | Baffigi, F. Cristoforetti, G. Fulgentini, L. Giulietti, A. Koester, P. Labate, L. Gizzi, L. A. |
description | Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying pre-plasma scale length, laser intensity, and polarization. The simultaneous detection of 2ω and 3ω/2 emission allowed the contributions to the X-ray yield to be identified as originating from laser interaction with either the near-critical density (nc) region or with the nc/4 region. In the presence of a moderate pre-plasma, our measurements reveal that, provided the pre-plasma reaches a scale-length of a few laser wavelengths, X-ray emission is dominated by the contribution from the interaction with the under dense plasma, where electron plasma waves can grow, via laser stimulated instabilities, and, in turn, accelerate free electrons to high energies. This mechanism leads also to a clear anisotropy in the angular distribution of the X-ray emission. Our findings can lead to an enhancement of the conversion efficiency of ultra short laser pulses into X-rays. |
doi_str_mv | 10.1063/1.4886977 |
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A.</creator><creatorcontrib>Baffigi, F. ; Cristoforetti, G. ; Fulgentini, L. ; Giulietti, A. ; Koester, P. ; Labate, L. ; Gizzi, L. A.</creatorcontrib><description>Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying pre-plasma scale length, laser intensity, and polarization. The simultaneous detection of 2ω and 3ω/2 emission allowed the contributions to the X-ray yield to be identified as originating from laser interaction with either the near-critical density (nc) region or with the nc/4 region. In the presence of a moderate pre-plasma, our measurements reveal that, provided the pre-plasma reaches a scale-length of a few laser wavelengths, X-ray emission is dominated by the contribution from the interaction with the under dense plasma, where electron plasma waves can grow, via laser stimulated instabilities, and, in turn, accelerate free electrons to high energies. This mechanism leads also to a clear anisotropy in the angular distribution of the X-ray emission. Our findings can lead to an enhancement of the conversion efficiency of ultra short laser pulses into X-rays.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.4886977</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; ANGULAR DISTRIBUTION ; Anisotropy ; Conversion ; Dense plasmas ; Electron plasma ; ELECTRON PLASMA WAVES ; Emission ; Free electrons ; IRRADIATION ; KEV RANGE 10-100 ; LASERS ; Plasma ; Plasma physics ; Plasma waves ; POLARIZATION ; WAVELENGTHS ; X RADIATION ; X ray spectra ; X-rays</subject><ispartof>Physics of plasmas, 2014-07, Vol.21 (7)</ispartof><rights>2014 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c285t-9aa0378ce7bf00a142b3b816ec8b8e711e6eec2a67c0616e22b16aefdf7270973</citedby><cites>FETCH-LOGICAL-c285t-9aa0378ce7bf00a142b3b816ec8b8e711e6eec2a67c0616e22b16aefdf7270973</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,27903,27904</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/22304076$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Baffigi, F.</creatorcontrib><creatorcontrib>Cristoforetti, G.</creatorcontrib><creatorcontrib>Fulgentini, L.</creatorcontrib><creatorcontrib>Giulietti, A.</creatorcontrib><creatorcontrib>Koester, P.</creatorcontrib><creatorcontrib>Labate, L.</creatorcontrib><creatorcontrib>Gizzi, L. A.</creatorcontrib><title>X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma</title><title>Physics of plasmas</title><description>Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying pre-plasma scale length, laser intensity, and polarization. The simultaneous detection of 2ω and 3ω/2 emission allowed the contributions to the X-ray yield to be identified as originating from laser interaction with either the near-critical density (nc) region or with the nc/4 region. In the presence of a moderate pre-plasma, our measurements reveal that, provided the pre-plasma reaches a scale-length of a few laser wavelengths, X-ray emission is dominated by the contribution from the interaction with the under dense plasma, where electron plasma waves can grow, via laser stimulated instabilities, and, in turn, accelerate free electrons to high energies. This mechanism leads also to a clear anisotropy in the angular distribution of the X-ray emission. Our findings can lead to an enhancement of the conversion efficiency of ultra short laser pulses into X-rays.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>ANGULAR DISTRIBUTION</subject><subject>Anisotropy</subject><subject>Conversion</subject><subject>Dense plasmas</subject><subject>Electron plasma</subject><subject>ELECTRON PLASMA WAVES</subject><subject>Emission</subject><subject>Free electrons</subject><subject>IRRADIATION</subject><subject>KEV RANGE 10-100</subject><subject>LASERS</subject><subject>Plasma</subject><subject>Plasma physics</subject><subject>Plasma waves</subject><subject>POLARIZATION</subject><subject>WAVELENGTHS</subject><subject>X RADIATION</subject><subject>X ray spectra</subject><subject>X-rays</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNpFkE1LAzEQhoMoWD8O_oOAJw-pSXabZL1J8QsKgij0FrLpLN2y3cQkW-2_N0sLnmaYeeblnRehG0anjIrink1LpUQl5QmaMKoqIoUsT8deUiJEuTxHFzFuKKWlmKkJ8ksSzB5b1-8gxNb12DV46FIwJK5dSLgzEQL2Qxch4rw2OLquXeFotr6DB_zhOhhvoAObQgZ-zC6T8GvbBCvc9jitAfsAxGeprblCZ43JYtfHeom-np8-569k8f7yNn9cEMvVLJHKGFpIZUHWDaWGlbwuasUEWFUrkIyBALDcCGmpyGPOayYMNKtGckkrWVyi24Oui6nVcXRj1_nNPtvUnBe0pFL8Uz647wFi0hs3hD4b05xxIUVVMJ6puwNlg4sxQKN9aLcm7DWjeoxdM32MvfgD0910ew</recordid><startdate>20140701</startdate><enddate>20140701</enddate><creator>Baffigi, F.</creator><creator>Cristoforetti, G.</creator><creator>Fulgentini, L.</creator><creator>Giulietti, A.</creator><creator>Koester, P.</creator><creator>Labate, L.</creator><creator>Gizzi, L. A.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20140701</creationdate><title>X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma</title><author>Baffigi, F. ; Cristoforetti, G. ; Fulgentini, L. ; Giulietti, A. ; Koester, P. ; Labate, L. ; Gizzi, L. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c285t-9aa0378ce7bf00a142b3b816ec8b8e711e6eec2a67c0616e22b16aefdf7270973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>ANGULAR DISTRIBUTION</topic><topic>Anisotropy</topic><topic>Conversion</topic><topic>Dense plasmas</topic><topic>Electron plasma</topic><topic>ELECTRON PLASMA WAVES</topic><topic>Emission</topic><topic>Free electrons</topic><topic>IRRADIATION</topic><topic>KEV RANGE 10-100</topic><topic>LASERS</topic><topic>Plasma</topic><topic>Plasma physics</topic><topic>Plasma waves</topic><topic>POLARIZATION</topic><topic>WAVELENGTHS</topic><topic>X RADIATION</topic><topic>X ray spectra</topic><topic>X-rays</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Baffigi, F.</creatorcontrib><creatorcontrib>Cristoforetti, G.</creatorcontrib><creatorcontrib>Fulgentini, L.</creatorcontrib><creatorcontrib>Giulietti, A.</creatorcontrib><creatorcontrib>Koester, P.</creatorcontrib><creatorcontrib>Labate, L.</creatorcontrib><creatorcontrib>Gizzi, L. 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A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma</atitle><jtitle>Physics of plasmas</jtitle><date>2014-07-01</date><risdate>2014</risdate><volume>21</volume><issue>7</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><abstract>Flat silicon samples were irradiated with 40 fs, 800 nm laser pulses at an intensity at the best focus of 2·1018 Wcm−2, in the presence of a pre-plasma on the sample surface. X-ray emission in the spectral range from 2 to 30 keV was detected inside and outside the plane of incidence, while varying pre-plasma scale length, laser intensity, and polarization. The simultaneous detection of 2ω and 3ω/2 emission allowed the contributions to the X-ray yield to be identified as originating from laser interaction with either the near-critical density (nc) region or with the nc/4 region. In the presence of a moderate pre-plasma, our measurements reveal that, provided the pre-plasma reaches a scale-length of a few laser wavelengths, X-ray emission is dominated by the contribution from the interaction with the under dense plasma, where electron plasma waves can grow, via laser stimulated instabilities, and, in turn, accelerate free electrons to high energies. This mechanism leads also to a clear anisotropy in the angular distribution of the X-ray emission. Our findings can lead to an enhancement of the conversion efficiency of ultra short laser pulses into X-rays.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4886977</doi></addata></record> |
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subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY ANGULAR DISTRIBUTION Anisotropy Conversion Dense plasmas Electron plasma ELECTRON PLASMA WAVES Emission Free electrons IRRADIATION KEV RANGE 10-100 LASERS Plasma Plasma physics Plasma waves POLARIZATION WAVELENGTHS X RADIATION X ray spectra X-rays |
title | X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma |
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