BBAR Coatings

Broadband AR coatings operate usually at lower efficiency than V-Coatings, but they provide anti-reflective properties over much wider spectral range. Spectral performance of a typical visible AR coating designed for BK7 glass is shown in the figure below.

R < 0.5% @ 450-650 nm @ 0° - 20° AOI

Some medical and telecom applications have pushed limits for BBAR requiring absolute reflection as low as 0.1% over several hundred nanometers. Plot below shows our high efficiency BBAR covering range from 1310 nm to 1650 nm.

R < 0.1% @ 1310-1650 nm @ 0° - 20° AOI

This AR coating has laser induced damage threshold of more than 1 MW/cm2 for CW and pseudo CW lasers, and in 100’s of GW/cm2 for

10 ns pulse, 20 – 30 Hz lasers, measured anywhere between 1310 and 1650 nm.
In addition to UV, visible, and NIR BBAR coatings our lab is known for very high quality, high laser damage threshold AR coatings that operate over 1.5 – 5.0µ.

Rav <1% @ 2.0 – 5.0 µ @ 0° - 20° AOI

These as well as any other coatings can be deposited on a variety of substrate materials, including crystals, fibers made of different IR materials, semiconductors, fluorides, selenides, and sulphides. Plot above shows spectral performance of the AR coating operating over 2.0 – 5.0 micron range with a very high pulsed and CW laser damage threshold. Plot below shows very efficient BBAR covering range from 8.0 – 12µ.

Rav <1% @ 0.5% 8.0 – 12.0 µ @ 0° - 20° AOI