Laser-power dependence of absorption changes in Ge-doped SiO2 glass induced by a KrF excimer laser

Makoto Fujimaki, Kanta Yagi, Yoshimichi Ohki, Hiroyuki Nishikawa

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The generation mechanism of the absorption changes, which cause a photorefractive change through the Kramers-Kronig relation in Ge-doped SiO2 glass, has not been clarified yet. In the present paper, we examined the laser-power dependence of the absorption changes around 5 eV, induced by a KrF excimer laser. The induced absorption around 5 eV is composed of three different components, centering at 4.50, 5.08, and 5.80 eV. The increasing behavior of each absorption component depends strongly on the energy density. The three absorption components reach different saturation levels, depending on the energy density. Furthermore, the absorption induced by a high-power KrF excimer laser is bleached by a laser, the energy density of which is about one-twentieth of the inducing laser. Combining the results of mathematical analysis, it was found that a two-photon process and a one-photon process are, respectively, involved with the induction and the bleach of each absorption. It was also found that the precursor defect, which causes the absorption change, is of an oxygen-deficient type.

Original languageEnglish
Pages (from-to)9859-9862
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number15
Publication statusPublished - 1996 Apr 15
Externally publishedYes

Fingerprint

Excimer lasers
excimer lasers
Glass
Lasers
glass
Two photon processes
Kramers-Kronig relations
lasers
High power lasers
flux density
Photons
Oxygen
Defects
applications of mathematics
causes
photons
high power lasers
induction
saturation
defects

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Laser-power dependence of absorption changes in Ge-doped SiO2 glass induced by a KrF excimer laser. / Fujimaki, Makoto; Yagi, Kanta; Ohki, Yoshimichi; Nishikawa, Hiroyuki.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 15, 15.04.1996, p. 9859-9862.

Research output: Contribution to journalArticle

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