Abstract

With the use of I- and z-scan techniques, the four-photon absorption cross section in a UV fused silica sample has been measured to be σ4=(1.0±0.5)×10115cm8s3 at 473 nm. This value is more than an order of magnitude lower than that known for other optical materials (KBr, KI, NaCl, TeO2, and GeS2).

© 2019 Optical Society of America

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