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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 13 — May. 1, 2012
  • pp: 2341–2345

Profiling of micrometer-sized laser beams in restricted volumes

Yevhen Miroshnychenko, Otto Nielsen, Aske Thorsen, and Michael Drewsen  »View Author Affiliations

Applied Optics, Vol. 51, Issue 13, pp. 2341-2345 (2012)

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We present a method for determining the three-dimensional intensity distribution of directed laser radiation with micrometer resolution in restricted volumes. Our method is based on the incoupling and guiding properties of optical fibers, with the current version requiring only a few hundred micrometers across the measuring volume. We characterize the performance of the method and experimentally demonstrate profiling of micrometer-sized laser beams. We discuss the limiting factors and routes toward a further increase of the resolution and beam profiling in even more restricted volumes. Finally, as an application example, we present profiling of laser beams inside a micro ion trap with integrated optical fibers.

© 2012 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3940) Instrumentation, measurement, and metrology : Metrology
(130.0130) Integrated optics : Integrated optics
(140.3295) Lasers and laser optics : Laser beam characterization
(060.4005) Fiber optics and optical communications : Microstructured fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 1, 2011
Revised Manuscript: February 19, 2012
Manuscript Accepted: February 24, 2012
Published: April 25, 2012

Yevhen Miroshnychenko, Otto Nielsen, Aske Thorsen, and Michael Drewsen, "Profiling of micrometer-sized laser beams in restricted volumes," Appl. Opt. 51, 2341-2345 (2012)

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  18. The fiber core acts as an effective “pinhole” for the incoupled into the fiber beam. The image of the pinhole is enlarged in the x direction due to the lensing effect of the fiber wall, but stays unchanged in the y direction. Using ray optics we estimate the enlargement to be n, where n=1.46 is the index of refraction of the fiber glass. The contribution from the lensing effect is fully taken into account in the calibration measurement; see Figs. 4 and 5.

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