BBAR and V Combinations

Broadband and V Combinations AR coatings operate over at least one spectral band and one spectral line. The combination usually operates over visible band plus one or more either IR or UV laser lines. Spectral performance of a typical BBAR-V combination is shown in the plot below. Coating is designed for CaF2 and it has to have very low reflection at 355 nm and efficient reflection reduction over 400-650 nm.

R < 0.1% @ 355 nm, Rav < 0.3% @ 400-650 nm
@ 0°-20° SUBSTRATE IS CaF2

Next example looks more as a very broad BBAR, but it is actually designed as the combination of the extended V-coating that operates over 950-1010 nm band, and the BBAR that covers very wide range from 1.2-1.7 µ.

Rav < 0.25% @ 950-1010 nm & 1.2-1.7 µ @ 0°-20° SUBSTRATE IS FUSED SILICA

Extreme case of BBAR and V combination is shown in the plot below, where BBAR covers range from 1000 – 5500 nm with average reflection below 2% and at the same time has R < 0.3% @ 532 nm.

R < 0.3% @ 532 nm, Rav < 2% @ 1.0-5.5 µ
@ 0°-10° SUBSTRATE IS SAPHIRRE

Plot below shows spectral performance of the 2V and BBAR combination operating over the visible range, and 1064 and 1057 nm laser lines. The coating is designed to have very high efficiency for laser lines and less than 0.5% average reflection at 440-680 nm range.

R <0.15% @ 1064 and 1570 nm &
Rav < 0.5% @ 440-680 nm @ 0°-5° AOI