Widefield heterodyne interferometry using a custom CMOS modulated light camera

Patel, Rikesh; Achamfuo-Yeboah, Samuel; Light, Roger; Clark, Matt

Abstract

In this paper a method of taking widefield heterodyne inter- ferograms using a prototype modulated light camera is described. This custom CMOS modulated light camera (MLC) uses analogue quadrature demodulation at each pixel to output the phase and amplitude of the modu- lated light as DC voltages. The heterodyne interference fringe patterns are generated using an acousto-optical frequency shifter (AOFS) in an arm of a Mach-Zehnder interferometer. Widefield images of fringe patterns acquired using the prototype MLC are presented. The phase can be measured to an accuracy of ±6.6◦. The added value of this method to acquire widefield images are discussed along with the advantages.

Citation

Patel, R., Achamfuo-Yeboah, S., Light, R., & Clark, M. (2011). Widefield heterodyne interferometry using a custom CMOS modulated light camera. Optics Express, 19(24), https://doi.org/10.1364/OE.19.024546

• Journal Article Type: Article
• Publication Date: Nov 15, 2011
• Deposit Date: Apr 29, 2014
• Publicly Available Date: Apr 29, 2014
• Journal: Optics Express
• Electronic ISSN: 1094-4087
• Publisher: Optical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 19
• Issue: 24
• DOI: https://doi.org/10.1364/OE.19.024546
• Public URL: https://nottingham-repository.worktribe.com/output/708688
• Publisher URL: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-24-24546
• Additional Information: This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-24-24546. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.