Widefield two laser interferometry
Patel, Rikesh; Achamfuo-Yeboah, Samuel; Light, Roger A.; Clark, Matt
Roger A. Light
A novel system has been developed that can capture the wide- field interference pattern generated by interfering two independent and incoherent laser sources. The interferograms are captured using a custom CMOS modulated light camera (MLC) which is capable of demodulating light in the megahertz region. Two stabilised HeNe lasers were constructed in order to keep the optical frequency difference (beat frequency) between the beams within the operational range of the camera.
This system is based on previously reported work of an ultrastable heterodyne interferometer [Opt. Express 20, 17722 (2012)]. The system used an electronic feedback system to mix down the heterodyne signal captured at each pixel on the camera to cancel out the effects of time varying piston phase changes observed across the array. In this paper, a similar technique is used to track and negate the effects of beat frequency variations across the two laser pattern. This technique makes it possible to capture the full field interferogram caused by interfering two independent lasers even though the beat frequency is effectively random.
As a demonstration of the system’s widefield interferogram capture capability, an image of a phase shifting object is taken using a very simple two laser interferometer.
|Journal Article Type||Article|
|Publication Date||Oct 23, 2014|
|Publisher||Optical Society of America|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Patel, R., Achamfuo-Yeboah, S., Light, R. A., & Clark, M. (2014). Widefield two laser interferometry. Optics Express, 22(22), https://doi.org/10.1364/OE.22.027094|
|Copyright Statement||Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf|
|Additional Information||© 2014 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.|
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf
You might also like
Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging
Crystallographic texture can be rapidly determined by electrochemical surface analytics
Targeted rework strategies for powder bed additive manufacture