Advanced

Laser produced X-ray source in the 10-60 keV range at 1 kHz. Modified irradiation schemes in order to reach medical imaging quality

Albert, F; Sjogren, A; Wahlström, Claes-Göran LU ; Svanberg, Sune LU ; Olsson, C and Merdji, H (2001) In Journal de Physique IV: Proceedings 11(PR2). p.429-432
Abstract
By tightly focusing ultra-short pulses from a Ti:sapphire terawatt laser onto a high-Z metallic target, hard x-ray pulses of short duration are produced. In most of our previous work concerning x-rays, a 150 mJ laser pulse with a 110 A duration has been used. Using mostly tin and tantalum targets, hard x-rays in the 10-60 keV range have been produced and used in differential absorption imaging around the K-alpha absorption edge of a contrast agent and also in imaging employing gated viewing for suppression of scattered radiation. In order to increase the x-ray yield (shortening the acquisition time) an increase in the laser repetition rate is desirable while still staying in the K-alpha energy regime. We have used a I kHz repetition-rate... (More)
By tightly focusing ultra-short pulses from a Ti:sapphire terawatt laser onto a high-Z metallic target, hard x-ray pulses of short duration are produced. In most of our previous work concerning x-rays, a 150 mJ laser pulse with a 110 A duration has been used. Using mostly tin and tantalum targets, hard x-rays in the 10-60 keV range have been produced and used in differential absorption imaging around the K-alpha absorption edge of a contrast agent and also in imaging employing gated viewing for suppression of scattered radiation. In order to increase the x-ray yield (shortening the acquisition time) an increase in the laser repetition rate is desirable while still staying in the K-alpha energy regime. We have used a I kHz repetition-rate laser delivering 35 fs pulses in order to work towards these goals. We have clear evidence of hard x-ray generation above 30 keV, even for low laser pulse energies. We also studied the effect of a fs prepulse. The medical imaging capability of the source was explored. The use of a prepulse has been optimized in order to improve the image quality as well as the overall x-ray generation yield. (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
Journal de Physique IV: Proceedings
volume
11
issue
PR2
pages
429 - 432
publisher
EDP Sciences
external identifiers
  • scopus:0034821510
ISSN
1764-7177
DOI
10.1051/jp4:2001283
language
English
LU publication?
yes
id
b3e38102-ccbb-4ed3-a7b7-233be5a955ba (old id 2257054)
date added to LUP
2012-02-24 15:24:15
date last changed
2018-01-07 10:02:09
@article{b3e38102-ccbb-4ed3-a7b7-233be5a955ba,
  abstract     = {By tightly focusing ultra-short pulses from a Ti:sapphire terawatt laser onto a high-Z metallic target, hard x-ray pulses of short duration are produced. In most of our previous work concerning x-rays, a 150 mJ laser pulse with a 110 A duration has been used. Using mostly tin and tantalum targets, hard x-rays in the 10-60 keV range have been produced and used in differential absorption imaging around the K-alpha absorption edge of a contrast agent and also in imaging employing gated viewing for suppression of scattered radiation. In order to increase the x-ray yield (shortening the acquisition time) an increase in the laser repetition rate is desirable while still staying in the K-alpha energy regime. We have used a I kHz repetition-rate laser delivering 35 fs pulses in order to work towards these goals. We have clear evidence of hard x-ray generation above 30 keV, even for low laser pulse energies. We also studied the effect of a fs prepulse. The medical imaging capability of the source was explored. The use of a prepulse has been optimized in order to improve the image quality as well as the overall x-ray generation yield.},
  author       = {Albert, F and Sjogren, A and Wahlström, Claes-Göran and Svanberg, Sune and Olsson, C and Merdji, H},
  issn         = {1764-7177},
  language     = {eng},
  number       = {PR2},
  pages        = {429--432},
  publisher    = {EDP Sciences},
  series       = {Journal de Physique IV: Proceedings},
  title        = {Laser produced X-ray source in the 10-60 keV range at 1 kHz. Modified irradiation schemes in order to reach medical imaging quality},
  url          = {http://dx.doi.org/10.1051/jp4:2001283},
  volume       = {11},
  year         = {2001},
}