Ultrathin glass as a continuously replaceable debris shield for laser systems.

Area of Science:

• Laser Physics and Optics
• Materials Science
• Optical Engineering

Background:

• High-repetition-rate laser systems necessitate robust protection for optical components against debris.
• Existing debris shields present trade-offs between optical quality and ease of replacement.

Purpose of the Study:

• To assess the suitability of ultrathin glass as a continuously replaceable debris shield for high-power laser applications.
• To evaluate its optical and mechanical performance compared to conventional materials.

Main Methods:

• Characterized optical transmission, wavefront error, and polarization of 50-μm ultrathin glass.
• Benchmarked performance against fused silica and nitrocellulose film.
• Developed and tested a roll-to-roll transport system for continuous shield replacement in vacuum.
• Evaluated optical stability and laser-induced damage under high-intensity Ti:sapphire laser operation.

Main Results:

• Ultrathin glass exhibited high UV-NIR transmittance and minimal wavefront distortion (λ/5 PV, λ/20 RMS).
• No birefringence was observed, and beam pointing stability was maintained below 40 µrad during translation.
• The shield sustained stable focusing and target interaction over 4000 shots with only minor transmittance loss from debris, not laser damage.
• A 20-m roll supported over 300,000 shots, demonstrating scalability.

Conclusions:

• Ultrathin glass is a viable, high-performance debris shield for demanding laser applications.
• The developed roll-to-roll system enables continuous, scalable protection for optical components.
• This solution addresses key limitations of current debris shielding technologies in laser facilities.