Fiber Pump Semiconductor Lasers With Optical Antiguiding Layers for Horizontal Transverse Modes

To suppress lasing in higher order transverse modes and improve kink levels in ridge-type 980-nm fiber pump semiconductor lasers, a novel ridge structure with optical antiguiding layers for horizontal transverse modes is proposed, and lasing characteristics are theoretically analyzed. In the proposed ridge structure, kink levels are improved by suppressing spatial hole burning and lowering optical gains for higher order transverse modes, with an increase in thickness of the antiguiding layers, which are located at both sides of an active region below a mesa. Also, threshold current is reduced due to concentration of injected current into the active region below the mesa.