Dielectric Plate Beamsplitter / PSM
Plate-type beamsplitters are dielectric multi-layer coatings on a parallel plate or a wedge substrate. They are designed to divide beams at a reflected light (R) : transmission light (T) ratio of 1:2 or 1:3. The rear surface is coated with anti-reflection (AR).
Common Specifications
| Material | BK7 |  |
|---|---|---|
| Surface Flatness | λ/10 | |
| Coating | Front surface: Dielectric multi-layer coating Rear surfaces: Multilayer anti-reflection coating |
|
| Wavelength Range | 400 － 700nm | |
| Incident Angle | 45° | |
| Laser Damage Threshold | 2.1J/cm2 (Laser pulse width 10ns, repetition frequency 20Hz) |
|
| Surface Quality (Scratch-Dig) | 10-5 | |
| Clear Aperture | 90% of the diameter |
| Schematic | Outline Drawing |
|---|---|
 |
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| Part Number | Reflectance : Transmittance | Diameter φD |
Thickness t |
Parallelism W |
Transmittance at 550nm (The average value of the P-Polarization and the S-Polarization) |
Transmittance at 400・700nm (The average value of the P-Polarization and the S-Polarization) |
|---|---|---|---|---|---|---|
| PSM33-25.4C03-10-550 | 1:2 | φ25.4mm | 3mm | ＜5″ | 67±3% | ＜80% |
| PSM33-30C03-10-550 | 1:2 | φ30mm | 3mm | ＜5″ | 67±3% | ＜80% |
| PSM33-30C05-10W-550 | 1:2 | φ30mm | 5mm | 1°±5′ | 67±3% | ＜80% |
| PSM25-25.4C03-10-550 | 1:3 | φ25.4mm | 3mm | ＜5″ | 75±3% | ＜90% |
| PSM25-30C03-10-550 | 1:3 | φ30mm | 3mm | ＜5″ | 75±3% | ＜90% |
| PSM25-30C05-10W-550 | 1:3 | φ30mm | 5mm | 1°±5′ | 75±3% | ＜90% |
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