Global View on Dose Rate Effects in Silica-Based Fibers and Devices Damaged by Radiation-Induced Carrier Trapping

Abstract

International audienceWe give a novel and very general treatment to a standard model describing dose rate effects in systems damaged by carrier trapping. This model is well adapted for optical fibers, but the lessons we draw may also be helpful to discuss dose rate effects (DRE) in electronic devices. By highlighting the few determinant ratios of physical parameters that govern the system behavior, we clarify when, how and how much dose rate effects affect trap filling and radiation-induced degradation. Critical dose rate, marking the demarcation between low and high dose rate regimes, is also estimated as a function of these parameters. Taking this step back is important to enlighten contradictory results reported on DRE behaviors. The dose and dose rate dependencies of trap filling measured on silica optical fibers, as well as the critical dose rate, are successfully reproduced with a single set of a few adjustable physical parameters

Performance of Ge-Doped Optical Fiber as a Thermoluminescent Dosimeter

“…One can conclude that within this range of doses and dose rates, the dose rate produces no effect whatsoever. This statement is in good agreement with the results of Mady et al [18] showing that no clear dose rate dependence is established in these same Ge-doped fibers.…”

Simultaneous effects of photo- and radio- darkening in ytterbium-doped aluminosilicate fibers

“…These outcomes have major consequences on the understanding and assessment of the YDF resistance for applications concerned with PRD. Future work will consist, firstly in the study of degradation kinetic without pumping, to highlight the usefulness of under pumping testing and not only passive testing which may provide opposite trend to our results [19,20]. Secondly in a study of other co-doping in YDF like with Al, P, Cerium and in testing of all this fibers in amplifying conditions.…”

Equilibrium Degradation Levels in Irradiated and Pumped Erbium-Doped Optical Fibers

“…Orders of magnitude for trapping and recombination coefficients are consistent with those expected for trapping and recombination cross-sections (10 -21 -10 -12 cm 2 [21]) and for the thermal velocity of holes in silica (significantly lower than that of electrons which is usually estimated to 10 7 cm s -1 ). They are also similar to those used in [22] where we applied a generalized model to germaniumdoped optical fibers. Given these values, the order of magnitude of σ PB N v was determined to reproduce correctly the experimental time scale.…”