IR Linear Film Polarizers
Linear Polarizer Selection Guide| Item Series | Wavelengh Range |
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| LPUV | 365 - 395 nm | | LPVIS | 550 nm - 1.5 µm | | LPVISA | 480 - 550 nm | | LPVISB | 500 - 720 nm | | LPNIR | 650 nm - 2.0 µm | | LPMIR | 1.5 - 5.0 µm |
Features- Better than Conventional Polarizers
- High Extinction Ratio
- High Operating Temperatures
- High Laser Damage Threshold
- Resistant Against UV and Chemicals
- Mounted and Unmounted Versions
- Two Polarizer Sizes: Ø12.5 mm and Ø25.0 mm
- Mounted Versions with SM05 or SM1 Threadings
The LPMIR Linear Polarizer Series is a better alternative to conventional polymer-based polarizers because the polarizing effect is generated using spherical ellipsoid nanoparticles embedded in sodium-silicate glass. Although both types of polarizers absorb the light polarized perpendicular to the transmission axis, the nanoparticles enable a significantly higher damage threshold and provide a dramatically better extinction ratio than polymers. A line is marked on the edge of the polarizer to indicate the polarization axis. All polarizers are available mounted or unmounted; choose from either Ø12.5 mm or Ø25.0 mm. The mounted versions are housed in cells that have either SM05 (0.535"-40) or SM1 (1.035"-40) external threading. Extinction Ratios and Laser Damage Thresholds| Item # | Wavelength Range | Extinction Ratios | Laser Damage
Threshold | Diameter | Thickness | Clear Aperture | Mounting |
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| LPMIR050 | 1500 - 5000 nm | > 10 000 : 1
2000 - 4500 nm
>1 000 : 1
1500 - 5000 nm | 10 W/cm2
Continuous Block
25 W/cm2
Continuous Pass | 12.5 mm (0.49") | 200 ± 50 µm | 90% of Surface Dimension | Unmounted | | LPMIR100 | 25.0 mm (0.98") | | LPMIR050-MP | 17.8 mm* (0.70") | 10.4 mm* (0.41") | Ø10.9 mm (0.43") | External SM05 (0.535"-40) | | LPMIR100-MP | 30.5 mm* (1.20") | 11.4mm* (0.45") | Ø22.9 mm (0.90") | External SM1 (1.035"-40) |
*Housing Dimension The LP Polarizer Series maintains an Extinction Ratio of at least 1,000:1 over the full operating bandwidth with a maximum Extinction Ratio greater than 10,000:1 at some wavelengths (see the Plots tab for details).
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| Item # | LPMIR Series |
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| Wavelength Range | 1500 - 5000 nm | | Extinction Ratio | >10,000 : 1 (2000 - 4500 nm) | | >1 000 : 1 (1500 - 5000 nm) | | Polarizing Material | Nanoparticles in Sodium-Silicate Glass | | Substrate Material | None | | Diameter (Tolerance) | Unmounted Version: 12.5 mm (LPxxx050) or 25.0 mm (LPxxx100) ± 0.2 mm;
Mounted Version: 17.8 mm (LPxxx050) or 30.5 mm (LPxxx100) | | Clear Aperture | Unmounted Version: 90% of Surface Dimension;
Mounted Version: 10.9 mm (LPxxx050) or 22.9 mm (LPxxx100) of Surface Dimension | | Thickness | Unmounted Version: 200 ± 50 µm;
Mounted Version: 10.4 mm (LPxxx050) or 11.4 mm (LPxxx100) incl. LPMIR Series | | Wavefront Distortion | <3λ @ 633 nm | | Acceptance Angle | ±20° | | Laser DamageThreshold | 10 W/cm² Continuous Block | | 25 W/cm² Continuous Pass | | Operating Temperature | -50 to +400 °C | | Maintenance | Clean with Standard Cleaning Solvents |
*The acceptance angle is limited by losses due to Fresnel reflections.
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 The plots below show the transmission as a function of wavelength (blue line) and the extinction ratio (ER) as a function of wavelength (red line) for the MIR linear polarizer when the light is normally incident. The percent transmission is the percentage of light with a linear state of polarization (SOP) aligned with the transmission axis of the linear polarizer that is transmitted through the linear polarizer. This number is less than 100 percent because of surface reflections and internal absorption. The ER is the ratio of the transmitted intensity of a linearly polarized beam of light with the orientation of the SOP parallel to the transmission axis of the linear polarizer to the transmitted intensity of the same linearly polarized beam of light with the orientation of the SOP perpendicular to the transmission axis of the linear polarizer. For reference, an ER of 1x106 is typical of a top-of-the-line Glan-Laser Calcite Polarizer, although a calcite polarizer has a significantly higher damage threshold.
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IR Linear Film Polarizers
