• Broadband Antireflection-Coated Faces for 400-700 nm
• Broadband Beamsplitting Coating on Internal Diagonal Surface
• N-BK7 Substrate

This non-polarizing beamsplitting cube has a broadband AR beamsplitting coating designed for 400-700 nm. This cube provides a 50:50 splitting ratio that is nearly independent of the polarization of the incident light (within 10%).

This cube is fabricated from N-BK7 and designed for minimal beam offset. A single reflecting surface also avoids ghost images. The dielectric beamsplitting coating is applied to the hypotenuse of one of the two prisms that make up the cube. Cement is used to bind the two prism halves together. In order to achieve the desired split ratio, the light must enter through one of the faces of the coated prism, which is indicated by a dot.

• Wavelength Range: 400-700 nm
• AR Coating (All Four Surfaces): R_avg <0.5% at 0° AOI from 400-700 nm
• Material: N-BK7
• Damage Threshold: 0.25 J/cm² (532 nm, 10 ns, 10 Hz, Ø0.341 mm)
• Dimensional Tolerance: +0.0/-0.2 mm
• Surface Flatness (@633 nm): ?/10
• Wavefront Distortion (@633 nm):
• Max Transmitted Beam Deviation: <5 arcmin
• Reflected Beam Deviation: 90° ± 5 arcmin
• Clear Aperture: >80% of Entrance Face
• Surface Quality: 40-20 Scratch-Dig
• Splitting Ratio: 50:50
• Splitter Ratio Tolerance: <15% over Entire Wavelength Range |Ts-Tp|<15% and |Rs-Rp|<15%