Long-period fiber grating as wavelength selective element in double-clad Yb-doped fiber-ring lasers

✍ Scribed by P. Peterka; J. Maria; B. Dussardier; R. Slavík; P. Honzátko; V. Kubeček

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 106 KB
• Volume: 6
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200910067

✦ Synopsis

Selection of operating wavelength of the Yb-doped fiber-ring lasers using long-period fiber gratings (LPFGs) is proposed. In the proposed method, customized LPFG that sustains high powers serves as a broad-band rejection filter. It modifies the net gain profile of the laser, enabling the peak gain to occur at a designed wavelength. Spectral range of oscillation between 1050-1110 nm was experimentally demonstrated. The spectral range can be extended to both shorter and longer wavelengths with proper design of the LPFG and length of the Yb-doped fiber. The gratings were inscribed by CO 2 laser and the grating period down to 175 μm was achieved being, to our best knowledge, the shortest reported LPFG period using this technique. Multimode pump at 975 nm Optical isolator Laser output Output coupler 80/20 Pump and signal combiner Ytterbium-doped double-clad fiber LPFG LPFG (optional) Setup of the fiber laser