Broadband Dielectric Beamsplitters
  • S-polarized beams split R/T = 50/50
  • P-polarized beams split R/T = 30/70
  • AR coated back surface eliminates ghosting
  • Slight wedge virtually eliminates internal fringes
  • BK 7 or UV fused silica substrates
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DescriptionSpecifications Models Catalog PDF

Our broadband dielectric beamsplitters are designed to provide general purpose laser beamsplitting and combining for visible through near infrared applications. Each coating is essentially achromatic across a wide spectral band so that a single optic will work for the entire range of a particular tunable laser, for several laser diode wavelengths, or for most visible laser wavelengths. The precision optical substrate has a dielectric beamsplitter coating on the front surface. The back surface is antireflection coated to prevent ghosting. A slight wedge in the substrate virtually eliminates internal fringes. S-polarized beams will be equally split with R/T = 50/50 at 45° incidence.

A p-polarized beam yields a split of R/T = 30/70. In unpolarized light, the performance is typically R/T = 40/60. These beamplitters are available in either BK 7 for general use, or UV grade fused silica for optimal wavefront and thermal stability. Coating options cover the visible to near infrared regions.

Coatings
 Wavelength Range
(nm)		  Reflectivity  Angle of Incidence  Coating Code
 480–700  Rs = 50 %  45°  BS.1
 700–950  Rs = 50 %  45°  BS.2
 1290–1580  Rs = 50 %  45°  BS.3