| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method capable of eliminating influence of fluorescent emission in a thickness direction, measuring two-photon absorption, and evaluating laser damage resistance of an optical material with respect to the optical material associated with the fluorescent emission. <P>SOLUTION: A method for measuring a two-photon absorption coefficient in a measurement region inside an optical material includes: [1] a measuring step for generating the two-photon absorption at a focal point position by irradiating pulse laser beams focused on at least two measurement regions with different depths from a surface of the material respectively while sequentially changing incident light intensity, and measuring a transmission coefficient and a total emission amount of fluorescent emission for each incident light intensity when the two-photon absorption is generated; [2] a transmission coefficient correction step for correcting the measured transmission coefficient based on measured values with respect to each incident light intensity; and [3] a two-photon absorption coefficient computing step for obtaining the two-photon absorption coefficient in the measurement region based on change in the transmission coefficient after the correction to change in the incident light intensity. <P>COPYRIGHT: (C)2012,JPO&INPIT |
