| SINGLE - LAYER ARC ( SLARC) |
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| 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 more effective on 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. |
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| The picture shows reflection of uncoated
surface of N-BK7 as well as 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. |
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| MULTI LAYER BROADBAND ARC |
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| SLARC cannot be used in
all applications. There are applications which need lower
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 substrate materials. |
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Multi-layer
broadband AR coating on N-BK7, average reflection
<0.30% per surface from 400-700nm for 0° incidence
angle.
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Multi-layer broadband AR
coating on N-BK7, reflection <1% per
surface from 400-1000nm for 0° incidence angle.
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| ARC for 900-2500nm on N-BK7 |
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| V - COATINGS |
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| These are coatings designed for
specific wavelengths. They can be tuned for any
required wavelength from UV to IR region. These can give
reflection as low as 0.1% per surface. We also do 1064nm coatings with
high damage threshold. |
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| DUAL BAND COATINGS |
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| These coatings are designed for 2
different wavelengths or wavelength ranges. |
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| ARC for 400-650 & 1064nm,
0° incidence. |
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ARC for 355 & 1064nm, BK7 glass,
0° incidence. |
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