An absolute surface encoder employing a mode-locked femtosecond laser

Ryo Sato; Hiraku Matsukuma; Wei Gao

doi:10.1117/12.3035032

22 November 2024 An absolute surface encoder employing a mode-locked femtosecond laser

Ryo Sato, Hiraku Matsukuma, Wei Gao

Proceedings Volume 13240, Holography, Diffractive Optics, and Applications XIV; 132401B (2024) https://doi.org/10.1117/12.3035032
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Abstract

An absolute surface encoder employing a mode-locked femtosecond is newly proposed. The encoder utilizes a variable line space (VLS) grating, whose grating pitch interval varies continuously with its grating position. When the femtosecond laser having a wide range light spectrum is illuminated onto the VLS grating, each wavelength diffracts with a difference diffraction angle. In addition, the diffraction angle of each wavelength changes corresponding to the position of the VLS grating due to the different grating pitch at each position. Therefore, it is possible to measure the absolute position by detecting the diffracted wavelengths by a detector with a designed angle. This paper reports about some basic verification about the feasibility of the proposed absolute surface encoder.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ryo Sato, Hiraku Matsukuma, and Wei Gao "An absolute surface encoder employing a mode-locked femtosecond laser", Proc. SPIE 13240, Holography, Diffractive Optics, and Applications XIV, 132401B (22 November 2024); https://doi.org/10.1117/12.3035032

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