Standard Cube Beamsplitters with Multi-Layer Dielectric Coating, Several Beamsplitting Ratios Available from Yutai Optics, such as T:R=50:50/70:30/80:20/60:40, wavelength for visible is ideal design for most application, other wavelength could also be available to be customized from Yutai Optics. Multiple Sizes Available 3mm-50mm are hot sale for optical instrument.Beamsplitters are Constructed by cementing two right angle prisms together.  Standard Cube Beamsplitters offer a range of reflection/transmission ratios. An interference coating has been applied to the hypotenuse surface of one of the prisms to provide the designated reflection/transmission ratio. Absorption loss to the coating is minimal. Polarizing Cube Beamsplitters(PBS) &Non-Polarizing Cube Beamsplitters(NPBS) are also acceptable to be customized from Yutai Optics. For Polarizing Cube Beamsplitters,we can achieve Extinction Ratio no more than 500:1 by now. We are trying to improve our coating skill.

Highly recommended Beamsplitter Prism list from Yutai Optics:
UVFS Beamsplitter,
H-K9L(BK7) Beamsplitter,
10mm/15mm/20mm/25mm/30mm/50mm Beamsplitter,
T:R=50:50/70:30/80:20/60:40...Beamsplitter,
Polarizing Cube Beamsplitters(PBS),
Non-Polarizing Cube Beamsplitters(NPBS).