J. Phys. IV France
Volume 11, Numéro PR2, Juillet 2001
X-Ray Lasers 2000
Page(s) Pr2-217 - Pr2-224
7th International Conference on X-Ray Lasers

J. Phys. IV France 11 (2001) Pr2-217-Pr2-224

DOI: 10.1051/jp4:2001241

Photopumping of innershell transitions by relativistic plasmas

E.E. Fill1, G. Pretzler2 and Th. Schlegel2

1  Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
2  Max-Planck-lnstitut für Quanfenoptik, 85748 Garching, Germany

A 130 fs 200 mJ titanium saphire laser is used to investigate conditions of generating inversion on an innershell transition in cobalt Using a longitudinal pumping geometry copper K-shell radiation is used to photopump cobalt [MATH]. The amount of photopumping is determined by comparing the generated cobalt radiation with the one of nickel, for which photopumping by copper [MATH] is not possible. Using a specially designed target with a vacuum gap in between the pump and the medium to be pumped we observe a photopumped fraction of over 90 %. The vacuum gap holds back the electrons which generate L-holes and thus destroy the inversion.

© EDP Sciences 2001