| SINGLE - LAYER ARC ( SLARC) |
|
|
| The
simplest of all AR coatings, this consists of a single
layer of MgF2 on the substrate. It is cost friendly because it can be done on simple, inexpensive machines. It is very useful for high
index glasses. We take an example of a three element camera lens. The
lenses are all of high index glasses and exhibit reflections of up to
8% per surface. This means that only 92% of the light would pass
through from each surface. At the end of three lenses (and 6 surfaces),
less than 70% of the light would pass through the system. This would
result in tremendous loss of light, reducing picture clarity and
inducing ghost reflections. If all the surfaces are coated with SLARC,
an average of 95% of light passes through the assembly resulting in
much sharper images and no ghost reflections. |
|
 |
|
| The picture shows reflection of uncoated
surface of BK7 and one having SLARC coating, at normal incidence. This
coating gives an average reflection of 1.5% per surface and is useful
from angles of incidence from 0° to 30°.The coating can
be tuned for other wavelengths from UV to IR region. |
|
|
| MULTI LAYER BROADBAND ARC |
|
|
| SLARC cannot be used in
all applications. There are applications which warrant much lesser
reflection over a broad range of wavelengths. These require multi-layers
which are more complicated. These can be for UV region, for visible
region, IR region. These can be designed and tuned for the required
wavelength range and for all kinds of materials. |
|
Multi-layer
broadband AR coating for visible region on BK7, average reflection
< 0.40% per surface from 415-700nm for 0° incidence
angle.
|
|
Higher efficiency multi-layer broadband AR
coating for visible region on BK7, average reflection <0.25% per
surface from 400-700nm for 0° incidence angle.
|
|
|
|
 |
|
 |
| |
|
|
| Extended range AR coating
(for BK7) |
|
UV anti-reflection coating (for Fused Silica) |
 |
 |
|
| V - COATINGS |
|
|
|
| These are coatings specifically designed for
specific wavelengths, used in Laser Optics. They can be tuned for any
required laser wavelength from UV to near IR region. These give
reflection < 0.3% per surface. We also do coatings which can
withstand high power lasers for 1064nm. |
|
 |
|
| DUAL BAND COATINGS |
|
|
|
| These are coatings designed for 2 different wavelengths or wavelength ranges. |
|
ARC for 355 & 1064nm, BK7 glass,
0° incidence. |
 |
| |
|
|
| ARC for 450-650 & 1064nm, BK7 glass,
0° incidence. |
|
ARC for 532 & 1064nm, BK7 glass,
0° incidence. |
 |
 |
