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MICRO-CONTROLE / Spectra-Physics
Antireflection Nano-Texture Surface Optics

Antireflection Nano-Texture Surface Optics

Product catalog summary

Antireflection Nano-Texture Surface Optics

Specifications: The document discusses the use of nano-texture technology on high purity fused silica lenses to achieve antireflection effects. These lenses exhibit high laser damage resistance for both pulsed and continuous wave (CW) applications, are chemically and mechanically robust, and have reflection losses as low as 0.1%. The absence of surface absorption reduces thermal lensing, improving beam parameters and long-term stability.

Nano-Texture Technology: Sub-wavelength anti-reflection (AR) nano-textures are etched directly into the surface of laser-grade fused silica windows and lenses. This results in reflection losses down to 0.1% over wide bandwidths from UV to NIR.

Broadband Anti-Reflection Performance: The document describes two types of AR nano-textures: the 'L' type for long wavelengths (500-800 nm with R<0.1% and 900-1100 nm with R<0.3%) and the 'S' type for short wavelengths (250-360 nm with R<0.1% and 400-550 nm with R<0.3%).

Increased Laser Damage Thresholds: The nano-textures do not involve dissimilar materials, leading to no added absorption or surface heating. This results in improved beam parameters and longer lifetimes for laser optics. Testing shows significantly increased damage thresholds compared to thin-film AR coatings.

Cleaning Instructions: Conventional cleaning methods for thin film coatings are not suitable for nano-textured optics. Recommended cleaning involves solvent rinsing with methanol or isopropyl alcohol, or immersion in ammonia solution or soap and water. Aggressive cleaning can be done with acid solutions but should be followed by rinsing with isopropyl alcohol and air drying.

Product Models: The document lists various models of nano-textured optics, including parallel windows and plano-concave and plano-convex lenses, specifying their dimensions, effective focal lengths (EFL), and applicable wavelength ranges.

Catalog excerpts

Antireflection Nano-Texture Surface Optics-1

A nanostructure pattern is created on the surface of high purity fused silica plano-convex lenses to produce an antireflection effect. Because this manufacturing process uses no thin films materials, the lens has a very high damage threshold limit. Nano-TextureTechnology Sub-wavelength anti-reflection (AR) nano-textures etched directly into the surface of laser grade fused silica windows and lenses exhibit reflection losses down to 0.1% over wide bandwidths from UV-NIR. Broadband Anti-Reflection Performance L Type AR nano-textures inherently perform over unprecedented bandwidths allowing coverage of multiple laser wavelengths in a single optic. Newport offers the long wavelength type, specified as “L” type AR textures R<0.1 % 500-800 nm, R<0.3% 900-1100 nm. Broadband Anti-Reflection Performance S Type Newport offers the short wavelength type, specified as “S” type AR textures R<0.1 % 250-360 nm, R<0.3% 400-550 nm. Increased Laser Damage Thresholds Because there are no dissimilar materials used or deposited, the AR nano-textures have no added absorption or surface heating. This results in improved beam parameters and longer lifetimes for your laser optics. Extensive laser damage tests have shown significantly increased pulsed and CW laser damage thresholds compared to thin-film ARs with damage thresholds equivalent to bulk material. • Chemically and mechanically robust & contamination resistant • Reflection loss down to 0.1 % • No surface absorption - reduced thermal lensing • Improved beam parameters and long term stability

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Antireflection Nano-Texture Surface Optics-2

ANTIREFLECTION NANO-TEXTURE SURFACE OPTICS CW and Pulsed Damage Thresholds Nano-Texture Optics Cleaning Instructions The nano-texture surface treatment yields extremelly high damage threshold results. Typical for pulsed laser applications, the threshold will be higher by 2-5x compared to the standard thin films AR V-coat method. Actual testing results show that the nano-textured optics damaged at 35.6 J/cm2 at 1064 nm, 10 ns pulses, with 0.5 mm diameter beam. Untreated high purity fused silica was also tested and damaged at 42.1 J/cm2 under the same parameters. Conventional cleaning methods used...

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