Monolithic fiber coupler for high power diode laser bars: results of prototype

A novel micro optical element is introduced, allowing coupling of light from several emitters of a laser diode bar into an optical fiber at high brightness. The monolithic fiber coupler is designed with individual segments for each emitter of the laser diode bar, providing two refractive surfaces for each emitter. By means of the monolithic fiber coupler, very cost effective fiber coupled laser diode modules based on bars are feasible. Consequently, approaches based on laser diodes bars can also compete with single emitter solutions for pumping application. Further applications of laser modules with monolithic fiber couplers may also be for direct material processing or as components in projection and illumination systems.