NDLI: Spatial characteristics of Kα radiation from weakly relativistic laser plasmas

Content Provider	Springer Nature Link
Author	Eder, D.C. Pretzler, G. Fill, E. Eidmann, K. Saemann, A.
Copyright Year	2000
Abstract	The spatial dependence of K α emission generated from laser-produced hot electrons is investigated experimentally and theoretically. In addition, the conversion efficiency of K α production as a function of laser intensity is measured and compared with modeling results. We use the terawatt Ti:sapphire laser at MPQ and vary the peak intensity from 1015 to 1018 W/cm2 with a pulse duration of 200 fs. A solid Cu target is placed at various positions in the laser focus, which allows one to vary the intensity but keep the total energy on the target constant. When the target is near best focus, the FWHM of the K α emission, measured using a knife-edge, is considerably larger than the FWHM of the laser intensity. In measuring the efficiency of K α production using the fundamental wavelength of the laser, a clear maximum of K α emission is observed at a position away from best focus, where the peak intensity is down by more than an order of magnitude from the value at best focus. When the second harmonic of the laser is used, the K α emission is peaked near best focus. The K α emission from layer targets is used to obtain an estimate of the temperature of the hot electrons. Modeling of K α production, using a Monte Carlo electron/photon transport code, shows the relationship between incident electron energy and the emitted K α emission. Efficient K α generation from the low-intensity wings of the laser pulse contributes to the large spot size of the K α emission. The lower electron temperatures that are expected for the second harmonic explain the differences in the location of maximum K α emission for the two wavelengths. We discuss the use of K α emission in photoionizing inner-shell electrons with the goal of achieving X-ray lasing at short wavelengths.
Starting Page	211
Ending Page	217
Page Count	7
File Format	PDF
ISSN	09462171
Journal	Applied Physics B
Volume Number	70
Issue Number	2
e-ISSN	14320649
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-02-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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