Optical beamsplitters

Beamsplitters

Beamsplitters are used to split or combine beam of light,The most common types of beamsplitters are plates and cubes.Plates are used for most laser application as they exhibit low absorption.Cubes are a convenient,protected form for low power applications.The performance of beamsplitters are mainly depended on the coating specifications.In selecting beamsplitters,the forms,coating,transmsission and damage threshold should be considered.

Beamsplitter Cube : compared with beamsplitter plate,it has the following advantages:
1. identical path lenghts for both the reflected and the transmitted beams.
2. The transmitted beam is neither displaced nor deflected.
3. Stable and compact.
4. Easy operation.
5. Easy to Mount/Algn.

Beamsplitter Cubes
Beamsplitter Cube is a more sophisticated type consisting of two right- angle prismscemented together at their hypotenuse faces.The cemented face of one prism is coated.Before cementing, with a metallic or dielectric layer having the desired reflecting properties, both in the percentage of reflection and the desired color. The absorption loss to the coating is minimal and transmission and reflection approach 50%.

Specifications:

Material: BK7 grade A optical glass
Dimension Tolerance: +0.2, -0.2mm
Thickness Tolerance: ±0.2mm
Surface quality: 60/40
Clear Aperture: >85%
Flatness: λ/4 per 25mm@633nm
Parallelism: ±3'
Bevel: <0.25mm X 45°
Coating: Hypotenuse surface :Partial reflective coating
Entrance/Exit surfaces :AR coating
Reflectance/Transmittance R/T=50/50% ±5% ;
Other ratio is available
( R,T are the average of S- and P-pol) ,AOI= 0°