Far-field focus sensor using moving interference fringes generated by a one-dimension uniform-pitch grating inside a collinear hologram data disc

Teruo Fujita; Ryusuke Ishisaka; Haruki Toyoshima

doi:10.1117/12.2322068

14 September 2018 Far-field focus sensor using moving interference fringes generated by a one-dimension uniform-pitch grating inside a collinear hologram data disc

Teruo Fujita, Ryusuke Ishisaka, Haruki Toyoshima

Author Affiliations +

Proceedings Volume 10757, Optical Data Storage 2018: Industrial Optical Devices and Systems; 1075708 (2018) https://doi.org/10.1117/12.2322068
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

This paper reports the theoretical analysis and experimental results of a far-field focus sensor. This system utilizes moving interference fringes at the far-field caused by the one-dimension uniform-pitch grating embedded inside a disc. The intensity of the moving fringes was sampled and processed by a digital signal processor and synchronization circuits including a phase lock loop. A well-shaped and low-offset focus error signal was observed all over the disc rotation, as well as, the focus serve operation being confirmed. Finally, how this sensor can be adopted to the collinear hologram data storage system is discussed.

Conference Presentation

Citation Download Citation

Teruo Fujita, Ryusuke Ishisaka, and Haruki Toyoshima "Far-field focus sensor using moving interference fringes generated by a one-dimension uniform-pitch grating inside a collinear hologram data disc", Proc. SPIE 10757, Optical Data Storage 2018: Industrial Optical Devices and Systems, 1075708 (14 September 2018); https://doi.org/10.1117/12.2322068

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