Opto Sigma

• All-dielectric coatings optimized to be insensitive to polarization at design wavelengths
• BK7 cube material - polished to λ/4
• Available in a range of laser wavelengths
• Highest performance - negligible absorption
• 5mm beamsplitter cubes available for fiber optic applications
• Standard cubes from 5 to 20mm

The all-dielectric coatings for these cube beamsplitters are largely insensitive to the polarization state of the incoming beam. The coatings have been designed to hold both the s- and p-polarization components to the same ratio of reflection-to-transmission over a specific laser wavelength region. The graph shows a typical reflectivity curve for the 633nm wavelength. At all the design wavelengths the s-reflectance equals the p-reflectance within ±3%, while both the reflectance and the transmittance equal 50% within ±5%.

Non-polarizing beamsplitters are available for other wavelength regions. Please call.

These beamsplitters are made from optical grade BK7. The faces are all polished flat to λ/4 and two like prisms are cemented to form a cube. Both pairs of sides are parallel to within 5arcmin. The four outer faces are all Anti-Reflection coated.

Four standard sizes are offered: 5,10,15 and 20mm. Larger sizes are available on request.