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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 33 — Nov. 20, 2002
  • pp: 7025–7030

Novel circular-beam equalizing techniques that use graded-index fiber optics for a high-power laser diode

Yushi Takenaka, Lalit B. Sharma, Keisuke Furuta, Tetsuo Kojima, and Koji Yasui  »View Author Affiliations


Applied Optics, Vol. 41, Issue 33, pp. 7025-7030 (2002)
http://dx.doi.org/10.1364/AO.41.007025


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Abstract

We demonstrate a novel method of equalizing a laser diode (LD) beam into a circular beam. This method uses the twist effect of graded index (GI) fiber optics. An asymmetric LD beam with beam qualities of M2 = 500 in the slow axis and M2 = 4 in the fast axis is converted successfully into a symmetric circular beam with a beam quality of M2 = 175. The circular-output beam with 92% coupling efficiency from the fiber input to the fiber output is obtained with a 5-m-long GI1200 (1200 means a core diameter of 1200 µm) fiber for a 2-W LD array. We extend the experiments to a higher-power source with higher asymmetric beam qualities of M2 = 3000 and M2 = 4. By slightly bending the GI10000 (10000 means a core diameter of 10,000 µm) fiber, we have succeeded in generating a symmetric beam with a improved beam quality of M2 = 2000. The average beam quality is preserved when the asymmetric ratio is not high, and the beam quality degradation ratio is investigated up to asymmetric ratios of 750.

© 2002 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2310) Fiber optics and optical communications : Fiber optics
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3300) Lasers and laser optics : Laser beam shaping

History
Original Manuscript: March 27, 2002
Revised Manuscript: August 6, 2002
Published: November 20, 2002

Citation
Yushi Takenaka, Lalit B. Sharma, Keisuke Furuta, Tetsuo Kojima, and Koji Yasui, "Novel circular-beam equalizing techniques that use graded-index fiber optics for a high-power laser diode," Appl. Opt. 41, 7025-7030 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-33-7025

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