A platform has been developed for high-power, high-brightness, multi-single-emitter laser pumps for fiber lasers, directdiode,
and other applications. Using multi-mode fiber with 105μm core and 0.22 NA, fiber-coupled optical power up to
100 Watts and a brightness as high as 100 kW/mm2/sr can be achieved. Common schemes for increasing brightness include spatial, wavelength, and polarization-beam combination of multiple single-emitters. Spatial multiplexing has been chosen for this platform to leverage JDSU's proven reliability of highpower single-emitter packages and passive optical components. In one configuration, we achieved >60W fiber coupled optical power, 50 kW/mm2/sr, and 45% wall-plug-efficiency using 105 μm core, 0.22 NA fiber from this platform. An optional VBG can also be placed inside the package for achieving spectral locking over a 16 nm wavelength range.
We have developed a single-emitter multi-mode laser-diode-pump platform for high efficiency, brightness and high
reliability in a small form factor. This next-generation package is scalable to higher optical power and offers a low-cost
solution for industrial applications, such as fiber lasers, graphic arts and medical. The pump modules employ high
coupling efficiency, >90%, high power-conversion efficiency, >50%, and low thermal resistance, 2.2°C/W, in an
electrically-isolated package. Output powers as high as 18W have been demonstrated, with reliable operation at 10W
CW into 105μm core fiber. Qualification results are presented for 0.15NA and 0.22NA fiber designs.