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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 8 — Mar. 10, 2013
  • pp: 1591–1598

Measurement of the M2 beam propagation factor using a focus-tunable liquid lens

Robert D. Niederriter, Juliet T. Gopinath, and Mark E. Siemens  »View Author Affiliations

Applied Optics, Vol. 52, Issue 8, pp. 1591-1598 (2013)

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We demonstrate motion-free beam quality M2 measurements of stigmatic, simple astigmatic, and general astigmatic (twisted) beams using only a focus-tunable liquid lens and a CCD camera. We extend the variable-focus technique to the characterization of general astigmatic beams by measuring the 10 second-order moments of the power density distribution for the twisted beam produced by passage through multimode optical fiber. Our method measures the same M2 values as the traditional variable-distance method for a wide range of laser beam sources, including nearly TEM00 (M21) and general astigmatic multimode beams (M28). The method is simple and compact, with no moving parts or complex apparatus and measurement precision comparable to the standard variable-distance method.

© 2013 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(140.3295) Lasers and laser optics : Laser beam characterization

ToC Category:
Lasers and Laser Optics

Original Manuscript: December 5, 2012
Revised Manuscript: February 4, 2013
Manuscript Accepted: February 8, 2013
Published: March 5, 2013

Robert D. Niederriter, Juliet T. Gopinath, and Mark E. Siemens, "Measurement of the M2 beam propagation factor using a focus-tunable liquid lens," Appl. Opt. 52, 1591-1598 (2013)

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