We report an 830nm high power single spatial mode DFB laser design in the AlGaAs/GaAs system that offers
performance close to a Fabry-Perot design as well as manufacturing yield compatible with volume production.
Single-mode power in excess of 200mW at case temperature up to 600C is consistently obtained for current below
300mA. This performance level is enabled by use of an efficient, partially-corrugated design and a 2nd order grating
located on the p-side. Through careful design and an optimized epitaxial re-growth on the grating, promising
reliability results compatible with uncooled application are demonstrated.
We present performance improvements of fiber-coupled pump modules and broad-area lasers at 8xx nm, 9xx nm and 14xx nm wavelengths. Broad-area lasers with a 200 μm aperture at 808 nm for direct diode applications emit 11W CW and 30W pulsed. Pump modules at 830 nm for printing applications show excellent linearity, power stability of 2% and 95% of the power within 0.12 NA into a 50 μm core fiber at 1W CW. Broad-area lasers at 880 nm for pumping applications emit 18W CW with a peak wallplug efficiency of 64%. An improved design of 9xx pump modules is demonstrated with built-in feedback-protection (>30 dB at 1060 nm) that allows safe operation in multi-kW peak-power fiber lasers. Up to 3W of optical power with slope efficiency and peak wallplug efficiency of 0.64 W/A and 46%, respectively, is presented for 14xx nm broad-area lasers with a 100 μm wide aperture.
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.