Abstract
Excited state absorption (ESA) measurements of the Cr:Li2B4O7 glass(Cr:LBO-glass) along with preliminary interpretation are presented. Thepresence of chromium in its tri- (d3) and hexa- (d0) valence states isobserved. Both Cr3+ and Cr6+ ions appear to contribute in the de-excitationprocesses and can be attributed in the ESA spectra under excitationwavelengths at 308 nm, 488 nm, 515 nm and 610 nm. The ESA spectra detectedwith UV excitation have been interpreted in terms of transitions in theframework of the Cr5+O- centre, which forms after charge-transfer-type absorptionin the [CrO4]2- group. Assumption of the double-electron state of the 3d22p4electronic configuration together with crystal-field-split states of the3d12p5 configuration allowed us to reproduce the obtained ESA spectra. The ESAspectra of the Cr3+ ions have different characteristics and are related totransitions to the conduction band.
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