OSRAM Opto Semiconductors has launched a sub-project under its BRILASI research initiative, aimed at enhancing the performance of laser rods—specifically focusing on improving efficiency, output power, lifetime, and beam quality. The goal is to develop laser chips operating in the 910–980 nm wavelength range. These advanced components are already being used in industrial settings, delivering an optical output of 120 watts with a typical conversion efficiency of up to 70%.
Dr. Jörg Heerlein, Head of Laser Product Marketing at OSRAM Opto Semiconductors, highlighted that this new generation of laser bars enables the creation of more powerful and efficient components. As a leading supplier of laser chips and laser rods, OSRAM’s latest offering features a 50% fill factor, which refers to the ratio between the effective width and the total width of the bar. These laser rods are primarily used for pumping solid-state lasers or direct material processing. In addition to the existing 910–980 nm chips, the company plans to introduce versions at 808 nm and 880 nm, each capable of 120 watts with a 62% conversion efficiency.
With a 20% fill factor, OSRAM is able to produce even more advanced components suitable for light-coupled applications. The first batch of these laser rods will be available in the 910–980 nm range with a recommended output of 80 watts.
New Application Platform
These enhanced laser rods allow for a significant increase in system output power without compromising longevity. Additionally, systems with equivalent output power become smaller and more reliable.
Sample unencapsulated laser rods have already been introduced, and standard industrial laser bars with a 50% fill factor are expected to launch in the summer of 2008. By the same fall, laser rods designed for fiber-coupled applications will also be available.
From Research to Practice
The BRILASI project (High-brightness, high-power laser diode, FKZ 13N8601) was initiated by the German Federal Ministry of Education and Research and executed by the VDI (German Society of Engineers), with coordination from OSRAM Opto Semiconductors. The project team included representatives from laser system manufacturers, end users, and research institutions. Its main objective was to develop efficient and reliable laser diodes for industrial use.
OSRAM successfully met all project goals, producing laser rods with power outputs ranging from 100 to 170 watts, operating continuously for 20,000 hours or in long pulse mode, depending on the emission wavelength and packaging technology. Key improvements focused on optimizing the epitaxial structure to minimize power loss while maintaining low absorption losses. The project also enhanced the laser cavity design, further boosting performance and reliability.
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