MIRRORS
- Broadband Mirrors with multilayer dielectric
coatings
- New Cold Mirrors with multilayer dielectric
coatings
- Laser Line Mirrors with multilayer dielectric
coatings for 0 and 45 degree incidence
- Metallized Mirrors - Round with protected aluminum
coatings
- Metallized Mirrors - Square
& Rectangle
with protected aluminum coatings
- Parabolic Mirrors with protected aluminum
coatings
- Spherical Mirrors with protected aluminum
coatings
- Ultra-Broadband Mirrors with enhanced metallic
coatings
- New Ultra-violet Hot Mirrors with multilayer dielectric
coatings
Mirrors are a critical and
commonly used component in many optical systems. They are used to fold, bend
and focus optical beams. They often allow a more compact and manageable system
design. Optical quality mirrors are coated on their front surface with a
metallic or dielectric coating to reflect the light. Three characteristics are
important when choosing an optical mirror: surface figure, surface quality and
the coating specification.
Surface
figure refers to the geometric variation
of the actual mirror surface from the ideal. By convention this is measured in
fractions of a wave of light at 633nm. Note that because the light is reflected
from the surface the actual wavefront degradation will be twice the deviation
specified. Optical finishing techniques all suffer from a small boundary effect
at the edge of a component. This results in a slight turn down of the surface
in the outer 5% of the diameter. This turn down is typically less than two or
three times the nominal specification. As a result, only the central 90% of a
mirror should be used in demanding applications. Our best quality mirrors are
the Laser Mirrors and the Broadband Mirrors; they should be selected in most
situations where wavefront distortion and scattering are of concern.
Surface
quality refers to residual defects in the
surface of the mirror; normally slight scratches or streaks and digs or pits.
Apart from being unsightly, surface defects contribute to scattering of the
reflected light. In most imaging applications these contributions are
negligible and will not cause problems. In laser systems, however, scattering
can cause unwanted diffraction patterns and even (in higher power applications)
contribute to the failure of the coating. Our mirror specifications follow the
US Military Specification Standard MIL-0-13830A for scratch and dig
performance. Our Laser Mirrors and Broadband Mirrors provide the highest levels
of surface quality and should be selected for important applications.
Different
coatings are available for different
applications because no one coating is able to optimize all of the reflection
criteria at one time. Coatings will affect the intensity and polarization state
of the reflected beam and so should be chosen with care. Spectral reflectance
curves for our various coatings are shown in these charts and in the Coatings
Section. Note that the highest reflectivity is sometimes restricted to a narrow
spectral range. While all of our mirror coatings are durable, first surface
mirror coatings should be handled with care.
- Spectral Reflectance Curves
We also have a wide range
of special sizes, shapes and coatings available. Standard sizes are usually
more cost effective when you need only a few components. But we will be pleased
to quote on special and volume requirements - assuring you of our same high
standards and reliable performance with every order. Our prices are
competitive, our quality is excellent, and we know that you depend on us for
on-time delivery. Just call for further information.
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