Overview: Graded reflectivity laser mirrors are designed for precise spatial shaping of laser beams' intensity and phase characteristics. These mirrors feature coatings with radially varying reflectivity and/or phase effects, allowing for complex designs and non-rotationally symmetric patterns.

Applications: The primary use of these mirrors is in unstable resonator lasers, where they enable maximum power extraction and smooth far-field output. They are also used to achieve uniform irradiance distribution in applications like illumination, materials processing, and surgery. Additionally, they enhance focusing characteristics and improve coupling efficiency into optical fibers.

Specifications:

• Substrate Materials: Fused silica, optical glasses, ZnSe, ZnS, and Si.
• Design Wavelength Range: 266 nm to 5 µm.
• Size Range: 0.25 inches (6 mm) to 5 inches (127 mm).
• Surface Flatness: λ/20 at 633 nm.
• Damage Threshold: 10 J/cm², 20 nsec pulse at 1064 nm.
• Surface Quality: 10-5.
• Clear Aperture: 90%.
• Humidity Range: 0 to 100%.
• Temperature Range: −196 °C to 400 °C.

Technology: Ion beam sputtering (IBS) coating technology is used, providing high damage threshold, spectral and environmental stability, and mechanical durability, making these mirrors suitable for harsh environments.