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Photodarkening is an optical effect observed in the interaction of laser radiation with amorphous media (glasses) in optical fibers. Until now, such creation of color centers was reported only in glass fibers .〔 〕 Photodarkening limits the density of excitations in fiber lasers. ==Definition== One could expect the term photodarkening to refer to any process when any object becomes non-transparent (dark) due to illumination with light. Formally, the darkening of the photo-emulsion also could be considered as photodarkening. However, recent papers use this term meaning reversible creation of absorbing color centers in optical fibers. One may expect that the effect is not specific for fibers; therefore, the definition should cover wide class of phenomena, excluding, perhaps, non-reversible darkening of photographic emulsions. According to the Encyclopedia of Laser Physics and Technology, photodarkening is the effect that the optical losses in a medium can grow when the medium is irradiated with light at certain wavelengths. We may also define photodarkening as reversible creation of absorption centers in optical media at the illumination with light. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Photodarkening」の詳細全文を読む スポンサード リンク
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