Photochemical reaction of divalent-germanium center in germanosilicate glasses under intense near-ultraviolet laser excitation: Origin of 5.7 eV band and site selective excitation of divalent-germanium center

Masahide Takahashi, Kentaro Ichii, Yomei Tokuda, Takashi Uchino, Toshinobu Yoko, Junji Nishii, Takumi Fujiwara

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The photochemical reaction of Ge 2+ in 10GeO 2- 90SiO 2 optical fiber preform and the origin of the 5.7 eV optical absorption band induced by intense ultraviolet laser excitation have been investigated using a near-ultraviolet XeF excimer laser (3.7 eV) as the main excitation source. Based on the previous and present experimental results, it is concluded that the 5.7 eV optical absorption band does not originate from the Ge(2) electron trapped center. In place of this model, we have proposed an alternative structural model for the origin of the 5.7 eV band taking into account the experimental fact that the corresponding center is diamagnetic. In addition, it is found that the site selective excitation of the Ge 2+ center can be achieved by using laser sources with different photon energies.

Original languageEnglish
Pages (from-to)3442-3446
Number of pages5
JournalJournal of Applied Physics
Volume92
Issue number7
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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