Development of Air-Hole Type Double-Clad Fiber Lasers

Modeling and optimization of Q-switched double-clad fiber lasers.

The numerical modeling of actively Q-switched fiber lasers is systematically presented. On the basis of typical Q-switched ytterbium-doped double-clad fiber lasers under forward and backward pump, the dynamic characteristics of pulse energy, pulse width, population inversion, and stored energy at tens-of-kilohertz repetition rates are studied by using the traveling-wave method. The laser perfor...

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

Selection of operating wavelength of the Yb-doped fiber-ring lasers using longperiod fiber gratings (LPFGs) is suggested. 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 experime...

Self-induced laser line sweeping in double-clad Yb-doped fiber-ring lasers

Experimental observation of the self-induced laser line sweeping (SLLS) in fiber ring lasers is presented. The SLLS with the same gain fiber is studied in Fabry-Perot cavity for comparison. The SLLS effect manifests itself as a laser wavelength drift with speed of the order of nanometer per second from shorter to longer wavelengths across several nanometers and fast backward jump. Recently, the...

Project ? 1777 p Theoretical studies of scaling double - clad fiber lasers to high power

Development of fiber lasers

Field of Study Technology, Communication and Transport Degree Programme Degree Programme in Industrial Management Author(s) Yang Zhang and Guoqing Huang Title of Thesis Development of Fiber Laser Date 08.04.2013 Pages/Appendices 55 Supervisor(s) Heikki Salkinoja, Seppo Ryynänen Client Organisation/Partners