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Two-photon absorption of excimer-laser radiation in optical fibers

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Abstract

Summary: In recent years, ultraviolet-grade optical fibers have been developed; consequently, fiber sensors in the ultraviolet region have been studied. Excimer lasers are the most powerful and efficient ultraviolet sources, however the intense radiation of the excimer lasers often induces nonlinear optical phenomena in fibers. The photon energy of the ultraviolet light below 320 nm is more than one half of the bandgap of silica, therefore two photons are simultaneously absorbed. The two-photon absorption is one of the most important phenomena for high-power transmission, because it causes a nonlinear loss. Especially KrF-laser radiation (248 nm) causes a strong two-photon absorption and consequently a high loss in a fiber. 1)

© 1988 Optical Society of America

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