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Experimental demonstration of enhancing pump absorption rate in cladding-pumped ytterbium-doped fiber lasers using pump-coupling long-period fiber gratings

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4 Author(s)
Seungin Baek ; Sch. of Electr. Eng., Seoul Nat. Univ., South Korea ; Sookyoung Roh ; Yoonchan Jeong ; Byoungho Lee

A long-period fiber grating (LPFG) was inscribed in a single-mode fiber and was spliced with a ytterbium (Yb)-doped double-clad fiber in order to couple pump radiation of the inner cladding into the core in a cladding-pumped fiber laser. The use of an LPFG permits a partial core-pumping scheme in a cladding-pumping fiber laser because a portion of the pump radiation can be coupled to the core by LPFG. The enhancement of the pump absorption of a Yb-doped cladding-pumped fiber laser as the result of pump coupling by LPFG was 35%, and the maximal output power increased by up to 55% when a 20-W pump source is used.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 5 )

Date of Publication:

March 1, 2006

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