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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 36, Iss. 23 — Dec. 1, 2011
  • pp: 4671–4673

Fiber-based Bessel beams with controllable diffraction-resistant distance

Paul Steinvurzel, Khwanchai Tantiwanichapan, Masao Goto, and Siddharth Ramachandran  »View Author Affiliations


Optics Letters, Vol. 36, Issue 23, pp. 4671-4673 (2011)
http://dx.doi.org/10.1364/OL.36.004671


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Abstract

We experimentally generate n = 0 Bessel beams via higher-order cladding mode excitation with a long period fiber grating. Our method allows > 99 % conversion efficiency, wide or narrow conversion bandwidth, and accurate control of the number of rings in the beam. This latter property is equivalent to tuning the beam cone angle and allows for control of width and propagation distance of the center spot. We generate Bessel-like beams from LP 0 , 5 to LP 0 , 15 cladding modes and measure their propagation-invariant characteristics as a function of mode order, which match numerical simulations and a simple geometric model. This yields a versatile tool for tuning depth of focus out of fiber tips, with potential uses in endoscopic microscopy.

© 2011 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(140.3300) Lasers and laser optics : Laser beam shaping

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: September 9, 2011
Revised Manuscript: October 11, 2011
Manuscript Accepted: October 11, 2011
Published: November 30, 2011

Citation
Paul Steinvurzel, Khwanchai Tantiwanichapan, Masao Goto, and Siddharth Ramachandran, "Fiber-based Bessel beams with controllable diffraction-resistant distance," Opt. Lett. 36, 4671-4673 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-23-4671

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Supplementary Material


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» Media 2: AVI (2467 KB)     
» Media 3: AVI (3649 KB)     
» Media 4: AVI (2972 KB)     

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