Optical absorption of gamma-irradiated KTP crystals in the 0.9 — 2.5 μm range

Abstract

Pion elastic scattering on 4He was calculated within the second-order optical model. The roles of pion double isospin and spin flip in intermediate states and of recoil correlation were investigated in some detail. A second-order term, which represents the effects of true pion absorption, is also included in the optical potential. A comparison was made between the results obtained using the Kerman-McManus-Thaler and Watson formulations of multiple scattering theory.

Gamma irradiation-induced absorption in single-domain and periodically-poled KTiOPO_4 and Rb:KTiOPO_4

“…Comparison of the induced absorption measured in our experiments with the measurements reported in the literature [32][33][34] indicates that the absolute value of the induced absorption depends much stronger on the gamma radiation dose rate than on the cumulative dose. That would be the case if the processes of free carrier generation, recombination as well as color center self-annealing by the generated phonons are competing.…”

“…It was found that the SHG efficiency decreased by about 15% after exposure to 139 krad dose of gamma radiation, primarily caused by the decrease in the linear transmission in the spectral range around 500 nm. On the other hand the transmission of KTP at 1 µm was only weakly modified by doses as high as 1000 krad [34]. Susceptibility of the periodically poled KTP and Rb:KTP has not been investigated so far.…”