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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 25 — Sep. 1, 2007
  • pp: 6449–6453

Experimental investigation of the performance of an annular aperture and a circular aperture on the same very-small-aperture laser facet

Hongfeng Gai, Jia Wang, Qian Tian, Wei Xia, and Xiangang Xu  »View Author Affiliations


Applied Optics, Vol. 46, Issue 25, pp. 6449-6453 (2007)
http://dx.doi.org/10.1364/AO.46.006449


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Abstract

A very-small-aperture laser (VSAL) with a circular aperture has a trade-off between the spot size and the output power. A nanometric annular aperture is fabricated to overcome this difficulty. The advantages of the annular aperture are demonstrated by measuring and comparing its near-field intensity distribution with that of a circular aperture. These apertures are fabricated on the same VSAL to ensure that they are under the same illumination conditions. The experimental results indicate that an annular aperture produces a smaller spot size and a higher peak intensity than a circular aperture. The confinement effect and the enhancement effect are attributed to the convergence of the power flow that passes through the annular aperture. The observed enhancement effect decreases when the distance from the VSAL facet is increased, but it does not vanish even when the distance is as large as 3.5   μm .

© 2007 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(140.2020) Lasers and laser optics : Diode lasers
(180.5810) Microscopy : Scanning microscopy
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 11, 2007
Revised Manuscript: July 23, 2007
Manuscript Accepted: July 25, 2007
Published: August 30, 2007

Citation
Hongfeng Gai, Jia Wang, Qian Tian, Wei Xia, and Xiangang Xu, "Experimental investigation of the performance of an annular aperture and a circular aperture on the same very-small-aperture laser facet," Appl. Opt. 46, 6449-6453 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-25-6449

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