Broadband Cube Beamsplitters

Four wide wavelength regions for complete coverage of visible and near-IR
Cube faces AR coated to prevent ghosts
5mm beamsplitter cubes available for fiber optic applications
All coatings are multilayer dielectric
Standard beamsplitter cubes available for fiber optic applications

These superior broadband Beamsplitters use multilayer dielectric films to produce approximately equal reflectance and transmittance over a broad range of wavelengths. Three different wavelength ranges are offered covering the visible and near infra-red spectrum, as shown below.

The beamsplitting film is deposited on the hypotenuse face of a precision BK7 prism whose faces are /4 and the prism is cemented to an identical prism to form a cube which is parallel sided within 5arcmin. The four outer faces are all anti-reflection (AR) coated.

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Our beamsplitter cube assembly takes place in a clean room environment to ensure high quality.

Four sizes are offered including a very small 5mm cube which is ideal for fiber optic applications and other uses in which small configurations are required. Standard sizes are 5,10,15 and 20mm. Larger sizes are available on request.

Specifications & Tolerances
Substrate flatness:	/4
Surface quality:	40-20
Reflectance:	R_av=50%±5%
Dimensions:	±0.2mm
Parallelism:	<5arcmin
Material:	BK7, grade A

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