High Power Laser Polarizing Cube Beamsplitters
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Thin film polarizers optimized for use at popular laser wavelengths
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Transmitted extinction ratio of better than 2.5x10-3
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Reflected extinction ratio of better than 2x10-2
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Polarizing film mounted on the internal face of a cube beamsplitter
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Multilayer high efficiency narrowband Anti-Reflection coatings on all faces
These are thin film polarizers constructed as a cube. Thin film polarizers utilize the polarization which occurs on reflection from a plane surface. By combining a large number of such surfaces in a stack it is possible to obtain useful extinction ratios. The s-polarization is more than 99% reflected while the p-polarization can be suppressed in the reflected beam and become 95% transmitted. Thin film polarizers can be optimized for a particular wavelength to give superior performance for laser applications.
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| Wavelength Range (nm) | Cube Side, a (mm) | Material | Surface Flatness | Surface Quality | Dimensions tolerance | Beam deviation | Extinction ratio | Asymmetry | Transmittance of p-polarization | Coating | Damage threshold |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 355 | 10.0 | Fused Silica | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 2J/cm2 |
| 355 | 15.0 | Fused Silica | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 2J/cm2 |
| 355 | 20.0 | Fused Silica | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 2J/cm2 |
| 532 | 10.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 5J/cm2 |
| 532 | 15.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 5J/cm2 |
| 532 | 20.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 5J/cm2 |
| 1064 | 10.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 7J/cm2 |
| 1064 | 15.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 7J/cm2 |
| 1064 | 20.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1/400 | 1 deg | ≥ 97% | NMAR faces | 7J/cm2 |