What
is the damage threshold for your
anti-reflective and mirror coatings?
C-OCLI has tested the majority of our
coatings for their damage threshold
specifications. We understand that it is
important to our customers to know what this
limit is in order to preserve the integrity
of their optical systems.
The link below will bring you to the Optical
Coatings section of our catalog. Once you
click on the appropriate coating, it will
bring you to the pdf files for the
individual coatings. Below each specific
coating, there is a damage threshold
specification given. When coatings are very
similar in composition, there may be a
reference to another coating for its damage
threshold. Please note that all the values
given are for reference only and do not
imply a guarantee.
There are many different applications for
the coatings, so we tried to test them with
a common laser for the specified range of
the coating. They were typically tested
using a pulsed 1064nm laser and its
harmonics. Unfortunately, we could not
possibly test them for all different
configurations, including continuous (CW)
lasers. Therefore, we do not have any other
data than what is specified in the catalog
and there is not a simple formula to
determine how a different wavelength might
respond. There are simply too many
parameters that affect the damage threshold
of a coating.
Can C-OCLI
modify standard optics to custom sizes?
Yes, we can! Our ability to modify includes
edging diameters down and cutting to square
or rectangular shapes. This includes lenses
(both spherical and cylindrical), mirrors,
and filters (excluding the interference
filters).
There are a couple rules of thumb to follow
when modifying standard pieces.
-
The standard tolerance for modifications
is ?.25mm (?.01"). If a customer needs a
tighter tolerance, it must be specified.
-
A standard lens can be edged down to a
diameter that is no less than twice the
center thickness of the lens. For example,
we smallest we could edge a 01LPX084
(beginning diameter: 30mm, center
thickness: 8.4mm) down to would be 17mm.
-
A lens that is larger than 97mm in
diameter cannot be edged down.
-
A mirror can be modified, but the flatness
cannot be maintained to the original
specification because stress is induced
when a piece is modified.
What is the difference between the
Glan-Taylor and the Glan Thompson Polarizing
Prisms?
Both of these products take un-polarized
input and convert it to linear polarized
output. The main difference is the Taylor is
air spaced and the Thompson is cemented. The
advantage of the cemented prism (Glan-Thompson)
is that it has a greater field of view (as
great as 24 degrees depending on length).
The air spaced prism (Glan-Taylor) only has
around a 10 degree field of view. The
advantage of the air spaced is that it has a
higher transmission than the cemented Glan-Taylor.
Do
we coat Customer Furnished Materials?
W accept Customer Materials or Customer
Substrates for coating.
What is the optical
difference between BK 7 and fused silica?
BK 7 glass is one of the
most common and widely used borosilicate
crown glasses available. It performs well
against most chemical tests, it's relatively
hard, and does not scratch easily. BK 7
glass can be handled without the need for
special precautions. The bubble and
inclusion content is also very low. BK 7 has
the excellent transmission from 350nm to 1.5
µm. It can be a low-cost alternative to
fused silica.
Fused silica is another
common material used for optics. It has
greater transmission than BK 7 in the UV and
IR spectrum. Transmission ranges from 180nm
to 2 µm. Fused silica has a low coefficient
of thermal expansion, providing stability
and resistance to thermal shock over large
temperature excursions. Fused silica has
increased hardness and resisitance to
scratching. It can be an excellent
alternative to BK 7 glass depending on the
applications.
What
type of lenses are best suited to collimate
and focus a diode laser?
We offers collimating and
focusing lenses designed specifically for
diode laser wavelengths.The lenses are
designed and optimized for 780nm, 800nm, and
830 nm. They can also be used at other diode
laser wavelengths and still provide
excellent performance. Many of these lenses
are diffraction limited. Spherical
aberration, coma, astigmatism, and
sphero-chromatism have been corrected by the
design. These lenses can be antireflection
coated to provide better performance.
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