Osram Opto Semiconductors has developed a wide-area laser diode, which is reported to create laboratory brightness "records" with a lateral brightness of up to 4.8 W / (mm * mrad). The company said that the higher the brightness of the laser pointer, the more efficient the light into the fiber, so as to enhance the processing of fiber laser pumping module output power. This is one of the results of the "High Intensity Diode Laser Integrated Micro-Optics and Micro-Thermal Element" (IMOTHEB) project beginning in 2012. The project is funded by the German Federal Ministry of Education and Research and has been successfully completed.

An important application of fiber-coupled lasers is high-power lasers for pump material processing applications. For large-area laser diodes, the lateral brightness is as high as 4.8 W / mm * mrad is one of the highest values known for wide-area laser diodes. Osram OS said the optimization of chip design, in particular by integrating micro-optics and micro-thermal components on the chip to achieve beam shaping, laid the foundation for this success. These improvements were implemented in the IMOTHEB research project coordinated by OSRAM. One of the objectives of the project is to further develop 50mw laser pointer chips that enable them to achieve higher optical output power with stable beam quality. The Max Born Institute as a project partner, through the provision of a wide range of methods and analysis of the chip development work has given tremendous support. These research results will continue to integrate into product development. Pump module output power increased by 10%.



An important application of fiber-coupled lasers is to pump high-power lasers for material processing, especially fiber lasers, such as sheet metal cutting and welding of sheet metal in the automotive industry, at the same time cost pressures are increasing. As a result, the IMOTHEB project aims to reduce the system cost of such pumping modules. Project partner DILAS Semiconductor Laser Co., Ltd. developed the concept of automated assembly of diode lasers.

Another key factor is the brightness of the burning laser pointer source. DILAS uses a demonstration module to verify that the OSRAM modified version of the chip can increase the output power of the module by 10%. "Because of the high brightness of the chip, more light is injected into the fiber, and the output power of the same module is higher than the output power of laser diodes currently used in this application," explained Dr. Alexander Bachmann, project coordinator of OSRAM Opto Semiconductors.

The IMOTHEB research project aims to improve the efficiency of the 1mw laser pointer system and reduce its production costs. This project (KZ 13N12312) was launched in October 2012 and is supported by the German Federal Ministry of Education and Research (BMBF) as part of the Integrated Micro-Photonics Initiative. OSRAM Opto Semiconductors is responsible for project coordination. Other project partners are Germany's DILAS Semiconductor Laser GmbH and the Max Born Institute in Germany.

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