Enhancement of Active Medium Pump Efficiency for a Distributed Feedback Waveguide Laser
On the basis of dielectric gratings, in which dielectric permittivity can be complex, and the imaginary part can be both positive and negative, waveguide microlasers are developed. The advantage of waveguide microlasers, comparing to conventional lasers are a low pump threshold, compactness and easy design for optical integration. The structure of distributed feedback (DFB) is considered as the most important configuration of waveguide lasers.