Overview: Lateral Displacement Beamsplitters are cemented by a right angle
prism and a rhomboid prism. The beamsplitter outputs two parallel
beams separated by a distance that depending on the size of
Rhomboid prism. The high tolerance design ensures the exiting beams
are parallel to within 2 arcmin. The cemented surface is coated with beamsplitter coating to achieve
a wide variety of beam splitting ratio such as 50:50 over a certain
wavelength range. The entrance and exit faces feature a multi-layer
anti-reflection (AR) coating for increased efficiency and reduce
the refection of the surface.
General Specifications of Lateral Displacement Beamsplitter: | Dimension Tolerance | ±0.2mm | | Surface Quality | 60/40 | | Clear Aperture | >90% | | Flatness | <λ/4@632.8nm | | Beam Deviation | <3 arc minutes | | Chamfer | Proteced<0.5mmx45° | | Coating | Partial reflectance on cemented surfaces
AR coating on all entrances | | T/R Tolerance | ±5%, T=(Ts+Tp)/2, R=(Rs+Rp)/2 | | Damage Threshold | >500mJ/cm2, 20ns, 20Hz, @1064nm |
Standard Products of Lateral Displacement Beamsplitter: | PN. | Material | Dimension A (mm) | T/R
(%) | Wavelength (nm) | Polarization | | LDB12-T50-400-700 | N-BK7 | 12.7 | 50/50 | 400-700 | Avg. | | LDB25-T50-400-700 | N-BK7 | 25.4 | 50/50 | 400-700 | Avg. | | LDB12-T50-650-900 | N-BK7 | 12.7 | 50/50 | 650-900 | Avg. | | LDB25-T50-650-900 | N-BK7 | 25.4 | 50/50 | 650-900 | Avg. | | LDB12-T50-900-1200 | N-BK7 | 12.7 | 50/50 | 900-1200 | Avg. | | LDB25-T50-900-1200 | N-BK7 | 25.4 | 50/50 | 900-1200 | Avg. |
Coating Graphs of Lateral Displacement Beamsplitter: 400-700nm 50:50 Lateral Displacement Beamsplitter | 650-900nm 50:50 Lateral Displacement Beamsplitter
| 900-1200nm 50:50 Lateral Displacement Beamsplitter
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