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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

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

Optics InfoBase > Applied Optics > Volume 52 > Issue 8 > Page 1591

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)
http://dx.doi.org/10.1364/AO.52.001591


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Abstract

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 (M2≈1) and general astigmatic multimode beams (M2≈8). 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

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

Citation
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)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-8-1591

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