Laser Polarizing Cube Beamsplitters
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Thin film polarizers optimized for use at popular laser wave lengths
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Transmitted extinction ratio of better than 1x10-2
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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) | Laser Type | Cube Side, a (mm) | Material | Surface Flatness | Surface Quality | Dimensions tolerance | Beam deviation | Asymmetry | Coating | Extinction ratio | Damage Threshold |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 405 | LD | 10.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 405 | LD | 15.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 405 | LD | 20.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 441.6 | HeCd | 10.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 441.6 | HeCd | 15.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 441.6 | HeCd | 20.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 458 | HeCd | 10.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10ns @1064nm |
| 458 | HeCd | 15.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10nm 21064nm |
| 458 | HeCd | 20.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10nm 21064nm |
| 488 | Ar Ion | 10.0 | BK7 | λ/4 | 40 - 20 | ±0.2mm | ≤ 10 arcmin | 1 deg | NMAR faces | Ts<2.5x10-3, <5x10-3@1064nm Rp<2x10-2 | <100mJ/cm2 in 10nm 21064nm |