Title :
High-peak power Yb-doped fiber laser system in 68-µm core multimode fiber with second air-hole cladding structure.
Author :
Yoshida, H. ; Tsubakimoto, K. ; Fujita, H. ; Miyanaga, N. ; Nakatsuka, M.
Author_Institution :
Inst. of Laser Eng., Osaka Univ., Suita, Japan
Abstract :
We have developed a high-peak and high-average power Yb-doped fiber laser system with second air-hole cladding structure. The near-field pattern of the output beam is near single mode (LP01) due to a bend in part of multi-mode fiber. Advantages of MMF double-clad fiber with second air hole cladding over the conventional double cladding fiber using a polymer cladding are a high numerical aperture (NA), suppression of skew rays and reduction of heat deposition. The laser output power of 300 W and slope efficiency of 74% was achieved in the cw laser oscillation with air-hole double cladding fiber.
Keywords :
fibre lasers; laser beams; optical fibre cladding; ytterbium; CW laser oscillation; JkJk:Yb; MMF double-clad fiber; efficiency 74 percent; heat deposition; high-peak power Ytterbium-doped fiber laser; multimode fiber; numerical aperture; power 300 W; second air-hole cladding structure; skew ray suppression; Fiber lasers; Laser beams; Laser modes; Optical fiber cables; Power amplifiers; Power generation; Power lasers; Pulsed laser deposition; Pump lasers; Stimulated emission;
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
DOI :
10.1109/CLEOE-EQEC.2009.5192648
