High brightness laser-diode device emitting 160 watts from a 100 µm/NA 0.22 fiber.

ABSTRACT

A practical method of achieving a high-brightness and high-power fiber-coupled laser-diode device is demonstrated both by experiment and ZEMAX software simulation, which is obtained by a beam transformation system, free-space beam combining, and polarization beam combining based on a mini-bar laser-diode chip. Using this method, fiber-coupled laser-diode module output power from the multimode fiber with 100 µm core diameter and 0.22 numerical aperture (NA) could reach 174 W, with equalizing brightness of 14.2 MW/(cm2·sr). By this method, much wider applications of fiber-coupled laser-diodes are anticipated.