Case Study: 1500 – 5000 nm AR 2 Side Sapphire

Data Table

Specification

Value

Anti Reflection Range

1500 – 5000 nm

Reflection %

R < 3.0% Per Surface Ave

Transmission Range

1500- 5000 nm

Transmission %

T% >94.0 % Ave

No. Sides Coated

2 Sides

Substrate

Sapphire

Dimensions

10 x 10 mm

Thickness

0.5 mm

Scratch/Dig

60/40

Quantity Per Year

50

Case Study:

 

This multi-layer anti-reflection coating was designed for use as a protective cover lens on a Lead Selenide (PbSe) detector. The uncoated sapphire substrate has an uncoated maximum transmission of just over 86% causing significant signal loss for the Lead Selenide detector across its sensitivity range of 1000 – 5200 nm. For this application the customer did not require an AR coating to cover the whole width of the PbSe detectors sensitivity range only 1500 – 5000 nm. The general rule is that the narrower the required transmission range is the lower we can get the reflection level. With this anti-reflection coating we were able to achieve greater than 96.0% average transmission between 1500 – 5000 nm significantly reducing signal loses. Lead Selenide detectors are widely used across the photonics industry in many applications such as gas and flame detection, infrared imaging, environmental monitoring and many more.

This process is one of our standard anti reflection processes, and it is very popular. All of our anti reflection coatings can be adapted and coated onto any substrate with any refractive index, please contact us to discuss the specifics of your requirement.