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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 3 — Feb. 4, 2008
  • pp: 1929–1944

Double clad tapered fiber for high power applications

V. Filippov, Yu. Chamorovskii, J. Kerttula, K. Golant, M. Pessa, and O. G. Okhotnikov  »View Author Affiliations

Optics Express, Vol. 16, Issue 3, pp. 1929-1944 (2008)

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We report a novel type of active fiber – tapered double clad fiber suitable for pumping by low brightness sources with large beam parameter product of 50÷300 mm×mrad. Ytterbium double clad all-silica fiber (core/1st clad/2nd clad diameters 27/834/890 µm, NAcore=0.11, NAclad=0.21), tapered down by a factor 4.8 for a length of 10.5 m was drawn from a preform fabricated by plasma chemical technologies. At a moderate Yb-ion concentration and 1:31 core/cladding ratio, the tapered double clad fiber demonstrates 0.9 dB/m pump absorption at 976 nm and excellent lasing slope efficiency. An ytterbium fiber laser with 84 W of output power and 92% slope efficiency, a 74 W superfluorescent source with 85% slope efficiency and amplifiers operating both in CW and pulsed regimes have been realized. All devices demonstrated robust single mode operation with a beam quality factor of M2=1.07.

© 2008 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 9, 2007
Revised Manuscript: December 20, 2007
Manuscript Accepted: January 14, 2008
Published: January 28, 2008

V. Filippov, Yu. Chamorovskii, J. Kerttula, K. Golant, M. Pessa, and O. G. Okhotnikov, "Double clad tapered fiber for high power applications," Opt. Express 16, 1929-1944 (2008)

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