title: High-speed cross-sectional imaging of valuable documents using common-path swept-source optical coherence tomography.
abstract: A common-path swept-source optical coherence tomography (SS-OCT) is a promising scheme for implementing a high-speed and stable OCT system. We investigate the capability of a common-path SS-OCT system to perform the cross-sectional imaging of valuable documents translated at high speed for the check of its security feature. The influence of transport speeds, up to 2000 mm/s, on the depth resolution and the signal intensity is experimentally evaluated using a SS-OCT system equipped with a swept source at a center wavelength of 1335 nm and with a sweep repetition rate of 50 kHz. The degradation of the measured signal is in good agreement with theory.
authors.affiliation: Research and Development Center, GLORY Ltd., 1-3-1 Shimoteno, Himeji, Hyogo 670-8567, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Fujiwara
authors.forename: Osamu
authors.initials: O
authors.lastname: Matoba