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Sensors 2016, 16(12), 2014; doi:10.3390/s16122014

Measurement of M2-Curve for Asymmetric Beams by Self-Referencing Interferometer Wavefront Sensor

1
College of Engineering, Huaqiao University, Quanzhou 362021, China
2
Fujian Provincial Academic Engineering Research Centre in Industrial Intelligent Techniques and Systems, Huaqiao University, Quanzhou 362021, China
Academic Editor: Vittorio M. N. Passaro
Received: 17 October 2016 / Revised: 15 November 2016 / Accepted: 23 November 2016 / Published: 29 November 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4706 KB, uploaded 29 November 2016]   |  

Abstract

For asymmetric laser beams, the values of beam quality factor M x 2 and M y 2 are inconsistent if one selects a different coordinate system or measures beam quality with different experimental conditionals, even when analyzing the same beam. To overcome this non-uniqueness, a new beam quality characterization method named as M2-curve is developed. The M2-curve not only contains the beam quality factor M x 2 and M y 2 in the x-direction and y-direction, respectively; but also introduces a curve of M x α 2 versus rotation angle α of coordinate axis. Moreover, we also present a real-time measurement method to demonstrate beam propagation factor M2-curve with a modified self-referencing Mach-Zehnder interferometer based-wavefront sensor (henceforth SRI-WFS). The feasibility of the proposed method is demonstrated with the theoretical analysis and experiment in multimode beams. The experimental results showed that the proposed measurement method is simple, fast, and a single-shot measurement procedure without movable parts. View Full-Text
Keywords: laser beam characterization; beam quality M2-curve; self-referencing interferometer wavefront sensor; fringe pattern analysis laser beam characterization; beam quality M2-curve; self-referencing interferometer wavefront sensor; fringe pattern analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Du, Y. Measurement of M2-Curve for Asymmetric Beams by Self-Referencing Interferometer Wavefront Sensor. Sensors 2016, 16, 2014.

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