High power direct diode laser optical system by planar lightwave circuit modules

Abstract

A direct diode laser (DDL) system has been proposed, consisting of a laser diode (LD), planar lightwave circuit(PLC) and optical fibers. The output from one PLC module is a 320 um times 300 um bundle optical fibers, each fiber having a rectangular core of NA0.3. The output efficiency was 74.2% at the fiber end. This PLC module may be applied as the light source for DDL processing or for the excitation module of a fiber laser.