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Sensors 2011, 11(11), 10293-10307;

An Optical Wavefront Sensor Based on a Double Layer Microlens Array

Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Roosevelt Road, Section 4, Taipei, Taiwan
Author to whom correspondence should be addressed.
Received: 25 August 2011 / Revised: 13 October 2011 / Accepted: 18 October 2011 / Published: 31 October 2011
(This article belongs to the Section Physical Sensors)
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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. View Full-Text
Keywords: microlens array; long focal length; Shack-Hartmann wavefront sensor microlens array; long focal length; Shack-Hartmann wavefront sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lin, V.; Wei, H.-C.; Hsieh, H.-T.; Su, G.-D. An Optical Wavefront Sensor Based on a Double Layer Microlens Array. Sensors 2011, 11, 10293-10307.

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