DescriptionSpecifications
Models
Catalog PDF
Newport Laser Line Non-Polarizing Beamsplitters are insensitive to the polarization of an incoming beam. Unlike broadband dielectric beamsplitters, which are extremely polarization sensitive, these beamsplitters provide a true 50/50 split regardless of the incoming polarization. The polarization components are matched to within 5%. Near zero absorption in these dielectric beamsplitters results in true 50/50 split of the beam and high damage threshold. They are especially useful for higher power applications where cemented cube beamsplitters may fail.
These beamsplitters are manufactured using high-precision BK 7 substrates to minimize wavefront distortion. A slight wedge in the substrate helps eliminate back reflections to the laser. The front surface is coated with a multilayer all-dielectric non-polarizing beamsplitter coating optimized for a specific laser line. The back surface is coated with a multilayer dielectric antireflection coating to minimize surface reflection losses and eliminate ghost images.
Non-polarizing beamsplitters are available for eleven common laser wavelengths. They are offered in a 25.4 mm diameter size to conveniently mount in Newport ULTIMA® Series, PERFORMA Series, and GM Series mounts. |
Specifications
| Material | BK 7, grade A, fine annealed optical glass or equivalent |
| Surface Flatness | ≤λ/10 at 632.8 nm over the clear aperture |
| Clear Aperture | >central 80% of diameter |
| Surface Quality | 15-5 scratch-dig |
| Diameter | 25.4 +0/-0.13 mm |
| Thickness | 6.1 ±0.38 mm |
| Wedge | 30 ±15 arc min |
| Transmission | 50 ±5%, independent of polarization |
| Reflection | 50 ±5%, independent of polarization |
| Polarization | S- and P-polarization components matched to within 5% |
| Absorption | <0.5% |
| Angle of Incidence | 45° ±3° |
| Antireflection Coating | Multilayer coating, R <0.5% per surface |
| Edges | Fine ground and beveled |
| Temperature Range | -50 °C to 90 °C |
| Durability | MIL-M-13508, MIL-C-675C, MIL-C-14806 |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (Unknown type Newport.Step.Product.XRefElement) |
| Orientation | Beam should enter surface marked with an arrow |
| Damage Threshold | 500 W/cm2 CW, 0.5 J/cm2 with 10 nsec pulses, typical |
| | Model | Description |
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10B20NP.22
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 488nm
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10B20NP.24
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 532nm
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10B20NP.25
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 632.8nm
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10B20NP.27
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 780nm
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10B20NP.28
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 830nm
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10B20NP.29
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 1064nm
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10B20NP.31
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Laser Line Non-Polarizing Beamsplitter, 25.4 Dia, 1550nm
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