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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper CThK62

Time-evolution of x-ray emission nonuniformity in x-ray laser medium

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Abstract

Many efforts have been made on optimization of x-ray laser gain since its first successful demonstration in 1984.1,2 Many previous theoretical and qualitative experimental studies indicating that the nonuniformity of line-shaped laser plasma is one of the key detrimental reasons to the make-up of x-ray laser gain, whereas the nonuniformity was caused mainly by the nonuniform laser irradiation have been reported.3,4 We report in this paper the results of time-evolution x- ray emission nonuniformity of Ti plasma produced under uniform line-shaped irradiation (the nonuniformity of the laser irradiation is within 5%,5 The spatially and time resolved 2-D images of Ti and Si x-ray emission have been obtained with a pinhole transmission grating spectrograph coupled with an x-ray streak camera (~30 ps time resolution). The output of the x-ray camera was recorded on Kodak TMAX professional film, which has been calibrated separately.6 The nonuniformity has been quantitatively investigated by means of perturbation spectrum analysis method for the first time to our knowledge. A brief description on the method is given below.

© 1996 Optical Society of America

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