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Title: Laser-Produced Coherent X-Ray Sources

Abstract

We study the generation of x-rays from the interaction of relativistic electrons with ultra-intense laser pulse either directly or via laser generated ion channels. The laser pulse acts as the accelerator and wiggler leading to an all-optical synchrotron-like x-ray source. The mm sized accelerator and micron-sized wiggler leads to a compact source of high brightness, ultrafast x-rays with applications in relativistic nonlinear optics, ultrafast chemistry, biology, inner-shell electronic processes and phase transitions.

Authors:
Publication Date:
Research Org.:
University of Michigan, Ann Arbor
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
899601
Report Number(s):
DOE/ER/14685
TRN: US1001841
DOE Contract Number:
FG02-96ER14685
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ACCELERATORS; BIOLOGY; BRIGHTNESS; CHEMISTRY; ELECTRONS; LASERS; NONLINEAR OPTICS; X-RAY SOURCES; High-power lasers, x-rays,

Citation Formats

Donald Umstadter. Laser-Produced Coherent X-Ray Sources. United States: N. p., 2007. Web. doi:10.2172/899601.
Donald Umstadter. Laser-Produced Coherent X-Ray Sources. United States. doi:10.2172/899601.
Donald Umstadter. Wed . "Laser-Produced Coherent X-Ray Sources". United States. doi:10.2172/899601. https://www.osti.gov/servlets/purl/899601.
@article{osti_899601,
title = {Laser-Produced Coherent X-Ray Sources},
author = {Donald Umstadter},
abstractNote = {We study the generation of x-rays from the interaction of relativistic electrons with ultra-intense laser pulse either directly or via laser generated ion channels. The laser pulse acts as the accelerator and wiggler leading to an all-optical synchrotron-like x-ray source. The mm sized accelerator and micron-sized wiggler leads to a compact source of high brightness, ultrafast x-rays with applications in relativistic nonlinear optics, ultrafast chemistry, biology, inner-shell electronic processes and phase transitions.},
doi = {10.2172/899601},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 31 00:00:00 EST 2007},
month = {Wed Jan 31 00:00:00 EST 2007}
}

Technical Report:

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  • In this project, we proposed to develop laser based mid-infrared lasers as a potentially robust and reliable source of ultrafast pulses in the mid-infrared region of the spectrum, and to apply this light source to generating bright, coherent, femtosecond-to-attosecond x-ray beams.
  • We measured the conversion efficiency of laser pulse energy into x-rays from a variety of solid planar targets and a Xe gas puff target irradiated using a high average power Nd:glass slab laser capable of delivering 13 ns FWHM pulses at up to 20 J at 1.053 {mu}m and 12 J at 0.53 {mu}m. Targets where chosen to optimize emission in the 9-19 {Angstrom} wavelength band, including L-shell emission from materials with atomic numbers in the Z=24-30 and M-shell emission from Xe (Z=54). With 1.053 {mu}m a maximum conversion of 10% into 2{pi} sr was measured from solid Xe andmore » type 302 stainless steel targets. At 0.527 {mu}m efficiencies of 12-18%/(2{pi} sr) were measured for all of the solid targets in the same wavelength band. The x-ray conversion efficiency from the Xe gas puff target was considerably lower, at about 3%/(2{pi} sr) when irradiated with 1.053 {mu}m.« less
  • We measured the conversion efficiency of laser pulse energy into keV x-rays from a variety of solid planar targets and a Xe gas puff target irradiated using a high average power Nd:glass slab laser capable of delivering 13 ns FWHM pulses at up to 20 J at 1.053 {mu}m and 12 J at 0.53 {mu}m. Targets where chosen to optimize emission in the l0--15 {angstrom} wavelength band, including L-shell emission from materials with atomic numbers in the range Z=24-30 and M-shell emission from Xe (Z=54). With 1.053 {mu}m a maximum conversion of 11% into 2{pi} sr was measured from solidmore » Xe targets. At 0.527 {mu}m efficiencies of 12--18%/(2{pi}sr) were measured for all of the solid targets in the same wavelength band. The x-ray conversion efficiency from the Xe gas puff target was considerably lower, at about 3%/(2{pi}sr) when irradiated with 1.053 {mu}m.« less
  • The concept of a laser-based proximity lithography system for electronic microcircuit production has advanced to the point where a detailed design of a prototype system capable of exposing wafers at 40 wafer levels per hr is technically feasible with high-average-power laser technology. In proximity x-ray lithography, a photoresist composed of polymethyl- methacrylate (PMMA) or similar material is exposed to x rays transmitted through a mask placed near the photoresist, a procedure which is similar to making a photographic contact print. The mask contains a pattern of opaque metal features, with line widths as small as 0.12 {mu}m, placed on amore » thin (1-{mu}m thick) Si membrane. During the exposure, the shadow of the mask projected onto the resist produces in the physical and chemical properties of the resist a pattern of variation with the same size and shape as the features contained in the metal mask. This pattern can be further processed to produce microscopic structures in the Si substrate. The main application envisioned for this technology is the production of electronic microcircuits with spatial features significantly smaller than currently achievable with conventional optical lithographic techniques (0.12 {micro}m vs 0.25 {micro}m). This article describes work on optimizing a laser-produced plasma x-ray source intended for microcircuit production by proximity lithography.« less
  • The non-divergent 'hot spot' from single crystals bombarded with electron beam from Febetron, Van de Graaff and sealed-off x-ray tube reveals discrete frequencies in bremsstrahlung. Stimulated Kossel line and radiative Auger Raman process have been observed in germanium crystals. Conical target x-ray tube bombarded by electrons at grazing angle give high contrast radiograph of materials and instruments. The observed coherent radiation has been profitably used for surface studies and could be used for development of x-ray holography.