Internship position in high-power fiber lasers

BLOOM Lasers company in collaboration with Institut Fresnel

BLOOM Lasers is a high technology company located in Pessac (33), France. The company develops,
manufactures, and sells nanosecond and picosecond pulsed lasers, primarily for applications in
microelectronics.The company is collaborating with Institut Fresnel in Marseille to study degradation mechanisms induced by UV light on optical components.

Internship subject : Improving high power UV lasers by reducing contamination effects
• Project background
The company’s current products reach 100W of UV optical power and rank among the highest-end on the market, offering customizable pulses in terms of shape, duration, and repetition rate.

However, intense UV light is extremely aggressive for optical components, especially when focused on small surfaces. This effect is today the main limitation in terms of product lifetime for all high-power UV lasers on the market. For this reason, studying UV-induced degradation effects and finding strategies to limit them is crucial and could have a strong impact on a large range of industrial laser applications.

• Subject of the internship
The student will use a high-power UV laser source to make contamination experiments. The principle of such experiment is to send the UV beam inside a sealed “burn-box” through the tested optics in presence of potential contamination sources. Changing the experimental parameters will help us to learn more about the sensitivity of the contamination process to the experimental conditions (atmosphere, temperature, beam focusing, polishing/coating on the optics and contaminant source). Studying the contaminated samples will also help us to understand better the nature of the contaminant. Finally, we intend to test some innovative solutions to reduce the LIC effect, for example using nanostructured coatings.

Internship BLOOM IFresnel_2025 ENG-V2