Optical fibers for high power applications

Purpose and goal

The aim of the project was to investigate the feasibility of a materials science project to develop new material compositions that enhance the performance and increase the value of optical fiber components sold by Swedish producers. The objective was to study the interaction between light and glass that under extreme conditions may limit the lifetime of the fiber components that Optoskand and Raybium manufactures. The project produced a new type of ytterbium doped fiber that partially meets the goal, but additional studies are required to confirm the function in the final product.

Results and expected effects

The scientific literature review resulted in a valuable compilation of known mechanisms that can lead to degradation of the glass at high power. This in turn provided the basis for experiments including manufacture and characterization of a fiber for fiber lasers. The results were positive and may potentially lead to improved fibers for fiber lasers. Complementary experiments may lead to patent application and scientific publications in a near future.

Approach and implementation

Literature studies were first performed to provide a scientific basis for the interaction between light and glass. A preliminary patent search was also made. Regular meetings were held to follow up the planned experiments. A dialogue was held with a customer who experienced optical degradation in one of the project partners´ products. Access to customer´s materials and own measurement has been requested and may be obtained later for analysis. According to plan, a glass with new optimized composition was also accomplished and a fiber was produced and characterized for photodarkening.