An optical wavefront sensor based on a double layer microlens array.

Sensors
Vinna LinGuo-Dung John Su

Abstract

In order to determine light aberrations, Shack-Hartmann optical wavefront sensors make use of microlens arrays (MLA) to divide the incident light into small parts and focus them onto image planes. In this paper, we present the design and fabrication of long focal length MLA with various shapes and arrangements based on a double layer structure for optical wavefront sensing applications. A longer focal length MLA could provide high sensitivity in determining the average slope across each microlens under a given wavefront, and spatial resolution of a wavefront sensor is increased by numbers of microlenses across a detector. In order to extend focal length, we used polydimethysiloxane (PDMS) above MLA on a glass substrate. Because of small refractive index difference between PDMS and MLA interface (UV-resin), the incident light is less refracted and focused in further distance. Other specific focal lengths could also be realized by modifying the refractive index difference without changing the MLA size. Thus, the wavefront sensor could be improved with better sensitivity and higher spatial resolution.

References

Jul 1, 1994·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J LiangJ F Bille
Jul 18, 2002·Accounts of Chemical Research·J Cooper McDonald, George M Whitesides

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Citations

Sep 28, 2013·ACS Applied Materials & Interfaces·Jiale YongXun Hou
Nov 28, 2017·Nature Communications·Kan ZhangZhenqiang Ma
Aug 31, 2017·Scientific Reports·Howon JungJae W Hahn
May 15, 2015·Optics Express·Jorge AlberoChristophe Gorecki

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Software Mentioned

Labview
Matlab
TracePro
SHWS

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