OPTICS

Dielectric Cube Beamsplitters

CSM

Cube beamsplitters with dielectric multi-layer coated on the hypotenuse face of a 45° right angle prism.
Divides beams at reflected light (R): transmission light (T) ratio of 1:2 or 1:3.

Catalogue
Optics & Optical Coatings
  • Anti-reflection coating (AR coat) is applied to the incident and outgoing faces.
  • The dielectric multi-layer films has virtually zero light absorption and very low light intensity loss. However, transmittance and reflectance may change according to wavelength, polarization and incident angles.
  • ln contrast to plate type half mirrors, cube mirrors have no ghosting or transmission optical path deviation.
Key Specifications
MaterialBK7
Surface Flatnessλ/4
Wavelength Range400 – 700nm
Beam Deviation<5′
CoatingHypotenuse surface: Dielectric multi-layer coating
Four surfaces: Multi-layer anti-reflection coating
Incident angle0°
Polarization of the incident beamUnpolarized light or 45 degrees Linear polariza- tion or cirlular polarization
Laser Damage Threshold0.3J/cm2
(Laser pulse width 10ns, repetition frequency 20Hz)
Surface Quality (Scratch−Dig)20–10
Clear aperture85% of actual aperture