- 옵틱스 | Optics > Dielectric Coated Optics
Material : UVFS, BK7
Dimensions : 5 - 25.4 mm
Surface quality, S-D : 20-10
Surface flateness, P-V : <λ/8 @ 632.8 nm*
Beamsplitting ratio : 50/50 ±5%
LIDT : >0.3 J/cm² @ 1064 nm, 10 ns, 10 Hz
< *depending on material and size >
Non-polarizing beamsplitter cubes are used for splitting beam 50/50. The hybrid metallic-dielectric materials of the coating mean that the cubes have minimal impact on polarization of the incident beam, a factor that is extremely important in some polarization-sensitive applications. On the other hand, there are a few drawbacks to hybrid metallic-dielectric coatings. The metallic layer causes an absorption loss of about 10 % and LIDT levels are usually 10 times lower compared with only dielectric-coated non-polarizing plate beamsplitters (NPBS).
Such cubes are usually chosen for convenient handling and easy aligning of systems compared with NPBS. For example, three cubes in a line can make a 50 / 25 / 12.5 power-splitting system, which can help in R&D applications to save time on repeated experiments.