9xx High-Power Broad Area Laser Diodes

摘要

In this communication we report on the performance characteristics of Bookham’s latest generation of 915-990 nmbroad area single emitter (BASE) laser diodes with around 90 μm wide aperture. Representative high power devicesin the wavelength range of 950-960 nm, mounted p-side down onto expansion matched assemblies using our highlyreliable AuSn-solder technology, reveal a high slope efficiency of around 1.05 W/A during CW operation at 25 °Cheat sink temperature. Coupling efficiency into multi-mode fiber with 0.15 or 0.22 numerical aperture exceeds93 % mainly due to the low vertical divergence of the laser beam. In addition, low laser threshold and seriesresistance enable more than 62 % maximum wall plug efficiency of the present generation of the laser diodes.Preliminary tests of new prototypes reveal already excellent performance characteristics of the next generationdevice with up to 19.9 W light output power in pulsed operation and 16 W for thermally limited CW operation.