Improved laser diode for high power and high temperature applications

摘要

The industry of laser marking, direct application and solid state laser pumping requires highly reliable and highly efficient laser diodes. In general, all applications demand improved brightness and temperature stability, and this by decreasing costs per watt. Instead of increasing the cavity length, we demonstrate in this paper an increase of power with standard cavity length with a clear focus on cost reduction and high efficiency. Improvements in the semiconductor material and packaging enable higher power and higher operation temperature. This technology raised the efficiency by 6 % of 808 nm bar with 50 % filling factor and a resonator length of 1.5 mm. Now, passively cooled diode lasers have reached nearly the performance of actively cooled ones. With this new design new fiber coupling modules with high brightness and high operation temperature for air cooled systems can be achieved.