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Physical Review B
The existence and the identification of only one or several coparticipating luminescent Yb 3+ centers in the heavily doped Yb:CaF 2 laser crystals which are considered in the development of several high intensity laser chains have been examined first by using two complementary and original experimental approaches, i.e., registration of low temperature site-selective laser excitation spectra related to near-infrared and visible cooperative emission processes, on the one hand, and direct imagingdoi:10.1103/physrevb.90.125124 fatcat:63infmhfnfdfpbabufoofmcery