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Related Experiment Video

Updated: May 27, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-P&#233;rot Etalon
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Fiber-based Bessel beams with controllable diffraction-resistant distance.

Paul Steinvurzel1, Khwanchai Tantiwanichapan, Masao Goto

  • 1Boston University, Department of Electrical and Computer Engineering, 8 Saint Mary’s Street, Boston, Massachusetts 02118, USA. pes2@bu.edu

Optics Letters
|December 6, 2011
PubMed
Summary
This summary is machine-generated.

Researchers generated Bessel beams using fiber gratings, achieving high efficiency and control over beam properties. This technique offers versatile control for applications like endoscopic microscopy.

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Area of Science:

  • Optics and Photonics
  • Fiber Optics
  • Beam Shaping

Background:

  • Bessel beams are non-diffracting beams with unique propagation characteristics.
  • Generating Bessel beams typically requires complex optical setups.
  • Controlling Bessel beam properties like cone angle and spot size is crucial for applications.

Purpose of the Study:

  • To experimentally generate n=0 Bessel beams using higher-order cladding mode excitation.
  • To demonstrate precise control over Bessel beam properties, including the number of rings and cone angle.
  • To explore the potential of this method for applications such as endoscopic microscopy.

Main Methods:

  • Utilized a long period fiber grating to excite higher-order cladding modes.
  • Experimentally generated Bessel-like beams from LP(0,5) to LP(0,15) cladding modes.
  • Measured propagation-invariant characteristics and compared them with numerical simulations and a geometric model.

Main Results:

  • Achieved >99% conversion efficiency for Bessel beam generation.
  • Demonstrated control over conversion bandwidth (wide or narrow).
  • Accurately controlled the number of rings in the Bessel beam, equivalent to tuning the beam cone angle.
  • Observed propagation-invariant characteristics that matched theoretical models across different mode orders.

Conclusions:

  • The developed method provides a versatile tool for generating tunable Bessel beams from fiber tips.
  • Precise control over beam parameters allows for tuning the depth of focus.
  • Potential applications include advanced imaging techniques like endoscopic microscopy.