J. Phys. IV France 11 (2001) Pr2-217-Pr2-224
Photopumping of innershell transitions by relativistic plasmasE.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