MWIR Coatings | RMI Optics

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3.0 µm ≤ λ ≤ 5.0 µm

Broadband Anti Reflection coatings substantially reduce surface reflectance over a broad spectral region. These coatings are less sensitive to angle of incidence than "V" coatings, which makes them well suited for the steeply curved surfaces of high numerical aperture lenses, or for applications in which it is necessary to vary the angle of incidence.

Narrowband Anti Reflection coatings, often referred to as "V" coatings, reduce surface reflectance to less than 0.25% at the specified center wavelength and normal incidence.

"V" coatings are better suited to laser applications than single-layer AR coatings. Coatings for high power wavelengths use special materials that are able to withstand higher power than standard narrowband anti-reflection coatings.

These all dielectric coatings are sensitive to polarization, wavelength and angle of incidence.

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*Example only, wavelengths may vary

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*Example only, wavelengths may vary

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3.0 µm ≤ λ ≤ 5.0 µm

Partial Reflection coatings are widely used for beamsplitting, beam sampling and laser output coupling. They divide an incident, monochromatic beam into reflected and transmitted components with the specified intensity ratio.

Coatings for high power wavelengths use special materials that are able to withstand higher power than standard partial reflection coatings.

These all dielectric coatings are sensitive to polarization, wavelength and angle of incidence.

3.0 µm ≤ λ ≤ 5.0 µm

Non-Polarizing Plate Beamsplitter coatings divide an incident, monochromatic beam into reflected and transmitted components with the specified intensity ratio. They are designed for applications in which it is necessary to maintain the polarization characteristics of the incident beam.

These all dielectric coatings are sensitive to wavelength and angle of incidence. They are durable and highly resistant to laser damage.

Thin Film Plate Polarizer coatings divide an incident, monochromatic beam into reflected and transmitted components with the specified intensity ratio. They are designed for applications in which it is necessary to maintain the polarization characteristics of the incident beam.

These all dielectric coatings are sensitive to wavelength and angle of incidence. They are durable and highly resistant to laser damage.

*Example only, wavelengths may vary

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3.0 µm ≤ λ ≤ 5.0 µm

Dichroic Filter coatings are designed to transmit one spectral region (passband) and reflect another (rejection band).

The filter is a Short Wave Pass (SWP) if the passband is to the left of the transition slope, and a Long Wave Pass (LWP) if the passband is to the right of the slope.

The advantages of Dichroic Filters over Colored Glass Filters are:

The rejection band is reflected rather than absorbed.
Steeper transition slope between the passband and the rejection band; i.e. sharper cut-on or cut-off.
Coatings can be custom designed for specific center wavelengths.

MWIR (3-5 μm)

Coating Types