Color centers contributing to the optical absorption spectrum of synthetic silica glass in the near infrared to vacuum UV range are reviewed. Intrinsic defects related to oxygen deficiency are characterized: E'-centers, oxygen vacancies, divalent silicon and defects related to oxygen excess: oxygen dangling bonds, peroxy radicals, interstitial oxygen and ozone molecules. The optical properties of common impurities/dopants in synthetic silicas used in laser optics are discussed.
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Skuja et al. (2001) studied this question.