Niigata University

A research group led by Associate Professor CHOI Samuel of the Electronic and Information Communications Program, Faculty of Engineering, Niigata University, in collaboration with Professor NIN Fumiaki of the Division of Biophysics and Physiology, Department of Life Principles, Graduate School of Medicine, Gifu University, and Professor HIBINO Hiroshi of the Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, has developed a new interference measurement method using an optical frequency comb1. Conventional optical comb measurements had problems such as fixed comb spacing making it difficult to adjust the measurement range and precision as well as the occurrence of blind regions where interference signals vanish. In this study, these constraints were overcome by introducing sinusoidal phase modulation (SPM) to the interference signal, achieving high-speed, high-precision, and wideband full-field 3D measurement while completely eliminating blind regions. These findings were published on July 12, 2026, in Optics & Laser Technology, the international journal specializing in optical measurement.

1. Optical Frequency Comb A special laser light in which the frequencies of light (colors of light) are arranged at equal intervals like comb teeth. As the light waves with a large number of frequencies are precisely aligned, the comb is used as an optical ruler for distance measurement and spectroscopic analysis. The comb is characterized by its extremely high precision in handling light frequencies.

Journal: Optics & Laser Technology Title: Optical comb-based interferometry with sinusoidal phase modulation for full-field surface profile and tomographic measurement Authors: Samuel Choi, Souta Miura, Atsuto Sugai, Shivam Kumar Chaubey, Fumiaki Nin, Hiroshi Hibino, Osami Sasaki. Doi: 10.1016/j.optlastec.2026.115926

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