title: Three-dimensional shape measurement of a diffusing surface by use of a femtosecond amplifying optical Kerr gate.
abstract: We propose a system for three-dimensional (3D) shape measurement of a diffusing surface by use of a previously developed femtosecond amplifying optical Kerr gate (fs-amp OKG). The system has an opening time of 459 fs and a maximum transmittance of 185%. It also provides good 3D imaging performance: a transverse imaging resolution of 70 microm, a depth resolution of 100 microm, and a positioning accuracy of 5.9 microm in depth. It is found that the optical Kerr effect and the amplification process in the fs-amp OKG do not cause the quality of a time-resolved image to deteriorate. We prove the effectiveness of the proposed system by measuring the shapes of completely diffusing objects with stepped and spherical surfaces.
authors.affiliation: National Research Laboratory of Metrology, 1-1-4 Umezono, Tsukuba, Ibaraki 305-8563, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yasui
authors.forename: K
authors.initials: K
authors.lastname: Minoshima
authors.forename: H
authors.initials: H
authors.lastname: Matsumoto