Terahertz Coherent Scanning Probe Microscope

Trukhin, V. N.; Zinov’ev, Nikolay N.; Andrianov, Aleksandr V.; Samoilov, L. L.; Golubok, A. O.; Felshtyn, M. L.; Sapozhnikov, I. D.; Bykov, Viktor; Trukhin, A. V.

doi:10.54362/1818-7919-2010-5-4-151-153

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“…7,8) It is known that a self-trapped exciton can be observed in SiO 2 , Al 2 O 3 and Y 2 O 3 crystals. [9][10][11][12] This indicates that the excitons and the lattice are strongly coupled in these materials, and bond-breaking defect formation, e.g., pair generation of an E′ center and an NBOHC in silica glass, 13,14) has occurred through the decay of a self-trapped exciton in silica, Al-doped, [15][16][17][18] and probably RE(rare earth)-doped silica glasses. On the other hand, exciton localization may occur due to interaction with pre-existing defects and create new defects.…”

Section: Introductionmentioning

confidence: 99%

Ge-codoping effect on X-ray-induced photodarkening in Al-doped and Dy-Al-doped silica glass

Okazaki¹,

Kawai²,

Otsuka³

et al. 2022

Jpn. J. Appl. Phys.

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X-ray induced photodarkening and its suppression by Ge-codoping were investigated in Al-doped, Dy-doped, and Dy-Al-doped silica glasses. Absorption bands of 4f-4f5d transition of Dy2+ were determined in Dy-Al-doped silica glass fabricated by Si nano-powders as a reducing agent, and it was found that pair generation of Dy2+ and Al-OHC was occurred in X-ray irradiated Dy-Al-doped silica glass. Ge-codoping suppresses the above-mentioned pair generation and instead forms the pair of GEC and GLPC+. Similar suppression effect of Ge-codoping was observed in Al-Ge-doped silica glass, where pair generation of Al-OHC and Al-E’ center was suppressed. To investigate the stability of defects, annihilation processes during thermal annealing was measured. Al-OHC and Dy2 + are destabilized by Ge-codoping in Al-doped and Dy-Al-doped silica glasses, while GEC is stabilized in Al-Ge-doped and Dy-Al-Ge-doped silica glasses. Based on these results, local structure models around Al, Ge, and Dy ions and possible mechanisms of photodarkening were proposed

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