AR Coated Windows
What is so special about AR coated components from OPTOMAN?
AR coatings made with Ion Beam Sputtering (IBS) are extremely durable and environmentally stable due to the density of layers.
Incredible resistance makes them perfect for on-field applications.
Low loss configuration allows transmittance higher than 99.98% of AR/AR coated components and absorption lower than 0.3 ppm @ 1064 nm, for example.
Typical commercial AR coatings feature residual reflectance below 0.25% per surface. 0.1% is becoming quite a common value as well. In any case, imagine having a laser beam with 1 kW power passing through such a component. Transmittance loss is ~2 W – 5 W and this light goes somewhere back to the laser system…
With the low loss coating technology, OPTOMAN can reduce this number down to 0.2 W, because residual reflectance per coated surface can go below 0.01%.
Damage threshold > 40 J/cm2 @ 1064 nm, 10 ns, 103–on–1.
Overview
Anti-Reflective Coated Windows, in most cases, protect expensive optical and laser systems. From the first sight, they might look very simple and easy to make components for. However, several critical characteristics, like substrate and coating materials, absorption, performance stability, and duty cycle, have to be taken into account when choosing correct windows.
Windows with IBS coatings are optimized to have excellent spectral performance, a high damage threshold, temperature & humidity independent performance, and a negligible fatigue effect. OPTOMAN can coat very basic round and rectangular windows as well as wedges and prisms with extremely complex shapes.
Features
Reflectance per surface down to R<0.01%.
Sputtered anti-reflective coatings feature performance close to theorectical.
Absorption loss <1 ppm per coated surface @ 1064 nm.
Absorption is the main damage and fatigue driver. With absorption being at low level, AR coated windows feature enhanced duty cycle.
Transmitted wavefront distortion <λ/20 @ 633 nm.
AR coated windows do not influence laser beam wavefront.
Temperature and humidity independent performance.
Durable, non-porous and near bulk coatings.
High Damage Threshold
AR coatings can be optimized to achieve a laser-induced damage threshold of 58 J/cm2, 1064 nm, 10 ns, 10^3-on-1.
Custom - Spectral range from 200 nm up to 5000 nm.
- Sapphire, YAG as a substrate material for mid-IR applications.
- High purity FS optimized for wavelength range. Bulk absorption down to 1 ppm/cm.
- Single wavelength, multiwavelength and broadband configuration.
- From extremely parallel windows (1'') up to complex wedges and prisms.
- Diameter from 3 mm up to 360 mm.
Design Examples
AR@1064 nm coated windows feature reflectance below 0.01%.
