Optical servo with high design freedom using spherical-wave Bragg degeneracy in a volume holographic optical element

Yeh Wei Yu, Chung Mou Shu, Ching Cherng Sun, Po Kai Hsieh, Tsung Hsun Yang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A novel optical sensor is proposed and demonstrated with the use of spherical-wave Bragg degeneracy of a volume holographic optical element. Bragg degeneracy can be performed perfectly for a volume hologram written by two plane waves or spherical waves. But only spherical reference light is useful to perform severe shifting selectivity in one direction and Bragg degeneracy in another direction. The experiment corresponding to theoretical simulation was demonstrated in a volume holographic optical element, which was an optical servo for a collinear volume holographic disc. Through clever design, the displacement response of the tracking beam was observed for a magnification magnitude of 980% to the displacement of the probe beam so that the resolution requirement of the photosensor can be reduced. Besides, a high linearity of the displacement response was observed. To discover the design freedom, a theoretical study of the displacement response was done for the servo by two spherical waves. The linearity, the magnification magnitude, and the diffraction efficiency were examined and the property of the Bragg degeneracy was figured out.

Original languageEnglish
Pages (from-to)35512-35523
Number of pages12
JournalOptics Express
Volume27
Issue number24
DOIs
StatePublished - 25 Nov 2019

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