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High-Reflection

Anti-Reflection
High-Reflection
Partial-Reflection
Beamsplitter
Polarizer
Filters(UV/IR/VIS)
Polarizers/wave plates
Beamsplitters/Paartial reflection

PHASE RETARDING MIRROR (PRM)

Phase Retarding mirror coatings are designed to produce a specific phase shift between the S and P polarization components of an incident CO₂laser beam. Coatings designed for 0。phase shift maintain the incident polarization state in the reflected beam. Coatings designed for λ/4 (90。) phase shift convert a linearly polarized beam into a circularly polarized beam.

Coatings designed for λ/8 (45。) phase shift convert a linearly polarized beam into an elliptically polarized beam.

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BARE AND PROTECTED GOLD (BAU, PAU)

Bare GOLD has high reflectance in the near, mid and far IR regions. Gold does not oxidize, so it is not necessary that it have a protective dielecric overcoat. Bare gold, however, is very soft and easily scratched, and can only be cleaned by flow-washing with solvents, or by blowing the surface clean with a low pressure stream of dry air. Durability is greatly enhanced with a protective overcoat. Protected gold offers excellent reflectance from 700 nm through far IR and can be cleaned regularly using standard organic solvents. It is somewhat less sensitive to wavelength, angle of incidence, or polarization, so it is useful for a wide range of monochromatic and polychromatic. Gold is chemically

Enhanced Gold is comprised of gold overcoated with a multilayer dielectric film that is designed
to optimize reflectance at a specific wavelength. This coating is recommended for applications
involving high power CW lasers, especially when deposited on copper substrates, due to heat
dissipation characteristics of copper. The enhancing layer also greatly improves durability,
meeting MIL SPEC requirements. This coating is sensitie to wavelength, angle of incidence and
polarization. Reflectance values can be further optimized further by adding more layers to the
enhancing overcoat. This option is available upon request.

Commonly used in the visible and near infrared regions, enhanced gold increases reflectivity
at 800nm from about 98% to 99.5%

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PROTECTED ALUMINUM (PAL) & ENHANCED ALUMINUM (EAL)

PROTECTED ALUMINUM (PAL)

Protected Aluminum is the most commonly used metal coating for less demanding, general purpose applications. As a front surface reflector, aluminum is overcoated with one of several transmissive materials, depending on the wavelength region of interest. As a back surface reflector, aluminum is overcoated with black epoxy paint.
Protected aluminum is somewhat less sensitive to wavelength, angle of incidence or polarization, so it is useful for a wide range of low power monochromatic and polychromatic applications. Durability meets MIL SPEC requirements.

ENHANCED ALUMINUM
(EAL) Enhanced Aluminum is comprised of aluminum overcoated with a few multilayer dielectric films
that is designed to optimize reflectance at a specific wavelength. the enhancing layer also greatly improves
durability, meeting MIL SPEC requirements. This coating is more sensitive to wavelength, angle of incidence
and polarization than protective metal coatings.

Enhanced Aluminum is used to enhance the reflectivity of bare aluminum, most commonly in the ultraviolet
region. At 193nm, bare aluminum will deliver about 91% reflectivity. Using enhanced aluminum at the same
wavelength will deliver greater than 98% reflectivity.

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BARE ALUMINUM (BAL)

Bare Aluminum offers greater than 86% reflectance from near UV to mind IR. Aluminum will slowly oxidize, resulting in a significant loss of reflectance in the UV, and slight scattering throughout the spectrum. Therefore, it is best if aluminum has a protective dielectric overcoat. A protective overcoat will also substantially improve abrasion resistance, so that the coating is less susceptible to damage during cleaning and handling.

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BROADBAND RMAX HIGH-REFLECTION (BHR) ND:YAG MULTI-WAVELENGTH RMAX HIGH-RE

Broadband Rmax High Reflection coatings are designed to provide high reflectance over a broad spectral region. These all dielectric coatings exhibit very low loss due to absorption and scatter. They are less sensitive to the angle of incidence than laser line RMAX mirror coatings, which makes them well-suited for the steepy curved surfaces of high numerical aperture mirrors, of for applications in which it is necessary to vary the angle of incidence.

Due to the large number of layers used to cover to cover the broad range, absorption and scattering are somewhat higher than Laserline coatings (LHR) resulting in a lower damage threshold

Nd:YAG Multi-wavelength Rmax High Reflection coatings provide high reflectance at both 1064
and 532 nm. These all dielectric coatings are sensitive to polarization, wavelength and angle of
incidence. They are durable and highly resistant to laser damage.

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LASERLINE RMAX HIGH-REFLECTION (LHR)

Laserline Rmax High Reflection coatings provide maximum reflectivity with very low loss due to absorption and scatter. Coatings for high power wavelengths use special materials that are able to withstand higher power than standard Rmax mirror coatings. These all dielectric coatings are sensitive to polarization, wavelength and angle of incidence. They are durable and highly resistant to laser damage.

The Excimer coatings are able to withstand the corrosive properties of Excimer gases, thus are well suited for intracavity applications.

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