NIR Coatings | RMI Optics

Near IR (700-2100 nm)

Materials: Fused Silica, IR-Fused Silica, BK7, Zerodur, Borofloat, Schott/Ohara Glasses

Coating Types

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700 nm ≤ λ ≤ 2100 nm

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.

700 nm ≤ λ ≤ 2100 nm

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.

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*Example only, wavelengths may vary

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*Example only, wavelengths may vary

700 nm ≤ λ ≤ 2100 nm

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 angle of incidence than laser-line RMAX mirror coatings, which makes them well suited for the steeply curved surfaces of high numerical aperture mirrors, or for applications in which it is necessary to vary the angle of incidence.

700 nm ≤ λ < 2100 nm

Laser-Line 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 dielectric coatings are sensitive to polarization, wavelength and angle of incidence.

*Example only, wavelengths may vary

700 nm ≤ λ ≤ 2100 nm

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.

*Example only, wavelengths may vary

700 nm ≤ λ ≤ 2100 nm

High Power Polarizing Cube Beamsplitter coatings are deposited between two optically contacted, right angle prisms. They are designed to separate an incident, unpolarized, monochromatic beam into its S and P polarization components with an extinction ratio (Tp/Ts) in excess of 200:1.

The incident energy is split into two orthogonally polarized beams that emerge at 90º with respect to each other.

These coatings were developed specifically for use in high power pulsed and CW laser applications.

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700 nm ≤ λ ≤ 2100 nm

Thin Film Plate Polarizer coatings are applied to window substrates and are primarily for use in laser cavities. Designed to operate at Brewster’s angle, they efficiently separate an incident, unpolarized, monochromatic beam into its S and P polarization components.

The extinction ratio (Tp/Ts) exceeds 200:1 in the transmitted beam.

Coatings for high power wavelengths use special materials that are able to withstand higher power than standard thin film plate polarizer coatings. These all dielectric coatings are sensitive to wavelength and angle of incidence.

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700 nm ≤ λ ≤ 2100 nm

Non-Polarizing Broadband Cube Beamsplitter coatings are vacuum deposited between two right angle prisms that are permanently cemented together. These coatings utilize a combination of metallic and dielectric films.

They are designed to divide an incident, polychromatic beam into reflected and transmitted components with a ratio (R/T) of 45/45 ± 5%.

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*Example only, wavelengths may vary

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*Example only, wavelengths may vary

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700 nm ≤ λ ≤ 2100 nm

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.

*Example only, wavelengths may vary