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. This effort seeks to develop laser chips operating in the 910–980 nm wavelength range, with practical applications delivering up to 120 watts of optical output and an impressive 70% conversion efficiency.
Dr. Jörg Heerlein, Head of Laser Product Marketing at OSRAM Opto Semiconductors, emphasized that the latest generation of laser bars enables the creation of more powerful and efficient components. As a long-standing leader in the field, OSRAM’s new laser bar features a 50% fill factor, making it a valuable resource for laser diode manufacturers. The fill factor 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.
Looking ahead, OSRAM plans to expand its product line by introducing laser chips at 808 nm and 880 nm wavelengths, each offering 120 watts of power with a 62% conversion efficiency. Additionally, with a 20% fill factor, the company is developing new components that offer superior performance for light-coupled applications. The initial release will include laser rods with a 910–980 nm wavelength range and a recommended output of 80 watts.
The introduction of these advanced laser rods allows for significant improvements in system output without compromising service life. Moreover, systems with equivalent power levels become more compact and reliable. Unencapsulated samples of the new laser rods have already been introduced, with standard industrial laser bars featuring a 50% fill factor expected to launch in the summer of 2008. By fall, laser rods tailored for fiber-coupled applications will also be available.
The BRILASI project (High-brightness, high-power laser diodes, FKZ 13N8601 for industrial applications) was funded by the German Federal Ministry of Education and Research and managed by the VDI (German Society of Engineers), with OSRAM Opto Semiconductors coordinating the initiative. The project involved collaboration among laser system developers, end users, and research institutions, aiming to create efficient and reliable laser diodes for industrial use.
OSRAM has successfully met the project's goals, achieving laser rod power outputs ranging from 100 to 170 watts over 20,000 hours of continuous wave (CW) operation or long-pulse mode, depending on the emission wavelength and packaging technology. Key advancements included optimizing the epitaxial structure to minimize power loss while maintaining low light absorption. The project also focused on improving the laser cavity design, further enhancing overall performance and reliability.
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