OSA's Digital Library

Applied Optics

Applied Optics


  • Vol. 43, Iss. 19 — Jul. 1, 2004
  • pp: 3893–3900

Tapered fiber bundles for combining high-power diode lasers

Andrey Kosterin, Valery Temyanko, Mahmoud Fallahi, and Masud Mansuripur  »View Author Affiliations

Applied Optics, Vol. 43, Issue 19, pp. 3893-3900 (2004)

View Full Text Article

Enhanced HTML    Acrobat PDF (760 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



Tapered fiber bundles are often used to combine the output power of several semiconductor lasers into a multimode optical fiber for the purpose of pumping fiber lasers and amplifiers. It is generally recognized that the brightness of such combiners does not exceed the brightness of the individual input fibers. We report that the brightness of the tapered fibers (and fiber bundles) depends on both the taper ratio and the mode-filling properties of the beams launched into the individual fibers. Brightness, therefore, can be increased by selection of sources that fill a small fraction of the input fiber’s modal capacity. As proof of concept, we present the results of measurements on tapered fiber-bundle combiners having a low-output étendue. Under low mode-filling conditions per input multimode fiber (i.e., fraction of filled modes ≤ 0.29), we report brightness enhancements of 8.0 dB for 19 × 1 bundles, 6.7 dB for 7 × 1 bundles, and 4.0 dB for 3 × 1 combiners. Our measured coupling efficiency variations of ∼1%–2% among the various fibers in a given bundle confirm the uniformity and quality of the fabricated devices.

© 2004 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2340) Fiber optics and optical communications : Fiber optics components
(140.2010) Lasers and laser optics : Diode laser arrays
(140.2020) Lasers and laser optics : Diode lasers

Original Manuscript: August 27, 2003
Revised Manuscript: February 6, 2004
Published: July 1, 2004

Andrey Kosterin, Valery Temyanko, Mahmoud Fallahi, and Masud Mansuripur, "Tapered fiber bundles for combining high-power diode lasers," Appl. Opt. 43, 3893-3900 (2004)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. W. A. Clarkson, D. C. Hanna, “Two mirror beam-shaping technique for high-power diode bars,” Opt. Lett. 21, 375–377 (1996). [CrossRef] [PubMed]
  2. P. Y. Wang, A. Gheen, Z. Wang, “Beam shaping technology for laser diode arrays,” in Laser Beam Shaping III, F. M. Dickey, S. C. Holswade, D. L. Shealy, eds., Proc. SPIE4770, 131–135 (2002). [CrossRef]
  3. D. M. Brown, “High-power laser diode beam combiner,” Opt. Eng. 42, 3086–3087 (2003). [CrossRef]
  4. J. Berger, D. F. Welch, W. Streifer, D. R. Scifres, N. J. Hoffman, J. J. Smith, D. Radecki, “Fiber-bundle coupled, diode end-pumped Nd: YAG laser,” Opt. Lett. 13, 306–308 (1988). [CrossRef] [PubMed]
  5. H. Zbinden, J. E. Balmer, “Q-switched Nd: YLF laser end pumped by a diode-laser bar,” Opt. Lett., 15, 1014–1016 (1990). [CrossRef] [PubMed]
  6. D. J. DiGiovanni, A. J. Stentz, “Tapered fiber bundles for coupling light into and out of cladding-pumped fiber devices,” U.S. patent5,864,644 (26January1999).
  7. B. G. Fidric, V. G. Dominic, S. Sanders, “Optical couplers for multimode fibers,” U.S. patent6, 434,302 B1 (13August2002).
  8. J. R. Leger, W. C. Goltsos, “Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum. Electron. 28, 1088–1100 (1992). [CrossRef]
  9. Y. F. Li, W. Y. Lit, “Transmission properties of a multimode optical-fiber taper,” J. Opt. Soc. Am. A 2, 462–468 (1985). [CrossRef]
  10. D. H. McMahon, “Efficiency limitations imposed by thermodynamics on optical coupling in fiber-optic data links,” J. Opt. Soc. Am. 65, 1479–1482 (1974). [CrossRef]
  11. M. C. Hudson, “Calculation of the maximum optical coupling efficiency into multimode optical waveguides,” Appl. Opt. 13, 1029–1033 (1975). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited