High-Damage-Threshold Mirrors

Research Electro-Optics Inc. (REO)

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BOULDER, Colo., Oct. 15, 2010 — REO is offering a wide range of high reflectors for pulsed solid-state lasers operating at 1064, 532 and 355 nm, as well as for use with multispectral laser systems. The high-damage-threshold mirrors combine ultralow scatter, good wavefront performance, high environmental stability and rugged mechanical durability, making them suitable for applications including military targeting and rangefinding, industrial materials processing systems, intracavity laser use and high- energy research lasers.

These characteristics are realized through the use of ion beam sputtering technology to produce fully densified coatings that are resistant to environmental contaminants, the employment of fabrication techniques that minimize subsurface damage, and rigorous control of contamination at all steps throughout the production process.

The company maintains extensive in-house metrology capabilities for thoroughly characterizing all phases of the manufacturing process, including laser damage testing in compliance with ISO 11254, instrumentation for producing quantitative maps of defect sites, and equipment for measuring absorption and scatter loss at numerous laser wavelengths.

The company delivers mirrors with laser damage threshold levels exceeding 20 J/cm2 for 3-ns pulses, and 40 J/cm2 for 20-ns pulses, both at 1064 nm.

The mirrors are fabricated and coated on a custom basis with typical specifications of 99.99% reflectivity, λ/20 flatness at 633 nm, 10-5 scratch-dig surface quality and scatter loss of 1 part per million. A wide range of sizes and shapes can be delivered, typically over the 6.35- to 254-mm-diameter range, from virtually any substrate material, including fused silica, optical glasses, Zerodur and Pyrex.

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Published: October 2010