Beam Splitter
Plate & Cube Beam Splitters
Plate beam splitters consist of a thin plate of optical glass with a different type of thin film coating on each side. The first surface is coated with an all-dielectric film having partial reflection properties over either the visible or the near-infrared spectrum. The benefit of this type of coating is that it has low absorption, typically 0.5 percent for a 50/50 splitter at 45°.
Cube beam splitters consist of two identical right-angle prisms with their hypotenuse faces cemented together. Prior to cementing, a partial reflection film is deposited onto one of the faces. For best results, the incident beam should be on one of the faces of this prism. For better performance cube beams plitters should be antireflection-coated on all four faces to minimize ghost images.
Cube beam splitter have several advantages over plate beam splitters and are widely used for a variety of reasons. Cube beam splitter deforms much less when Compare to plate Beam splitter . Most of the unwanted reflections from a cube beam splitter are in the retro direction and do not contribute to ghost images. The coating is very resistant to degradation with time because it is concealed in between prisms of the cube.
Types of Beam splitter and Selection Guide
Selection Criteria :
- Polarizing or non-polarizing
- Non-polarizing beam Splitting ratio (examples may be 50-50, 70-30, 90-10)
- Separating Wavelength
- Power handling (high power or high incident laser energy)
- Beam displacement tolerance
- Cube or plate Beam splitter
| Specification | Plate | Cube |
|---|---|---|
|
Wavelength
|
230 nm to 5000 nm |
|
|
Dimensions |
6 – 150 mm diameter |
6x6x6mm–50x50x50mm |
|
Beam splitting Ratio |
|
|
|
Coating types |
|
E-beam dielectric coated for LIDT |
Non Polarizing Cube Beam Splitter
| Specification | Grade |
|---|---|
|
Material |
BK7 |
|
Diameter Size |
10mm To Maximum |
|
Clear Aperture |
>80% |
|
Flatness |
< λ / 4 @ 633 nm |
|
Beam Deviation |
<3 arc minutes |
|
Chamfer |
Protected <0.5mm*45` |
|
Peak Transmission |
>45% |
|
Polarization |
<6% |
|
Coating |
AR Coating |
A beam splitter is used to split a beam of incident light in two. Our optical beam splitters are made from high-grade glass materials with laser grade surface flatness and surface quality for tighter tolerance on the beam splitting ratio.
These non-polarizing block beamsplitters are covered with the goal that the s and p segments agree in reflectance at the wavelength of intrigue. This implies they won’t change the condition of polarization of the episode shaft. They are hostile to reflection covered on the four outside appearances. These are not planned for high power use because of the concrete between the two crystals.
Beam Splitter: Broadband
Diameter: Laser beam manipulation, life science instrumentation
Material: BK7
Filter: Laserline
Diameter: Low power applications
Material: BK7
Standard Precision Grade
| Dimension | Material | Reflection / Transmission % | Wavelength Range | Beam Deviation | Surface Flatness |
|---|---|---|---|---|---|
|
12.5mm x 12.5mm x 12.5mm +/-0.1 |
BK7 |
30/70 ; 70/30 ; 50/50. |
400-700 nm |
5 arc min |
Lambda/4 |
|
20mm x 20mm x 20mm +/-0.1 |
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|
25mm x 25mm x 25mm +/-0.1 |
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|
37.5mm x 37.5mm x 37.5mm +/-0.1 |
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|
50mm x 50mm x 50mm +/-0.1 |
Non Polarizing Cube Beam Splitter
| Specification | Grade |
|---|---|
|
Substrate |
BK7 |
|
Dimensional Tolerance |
± 0.010″ |
|
Angle of Reflectance |
90° |
|
Clear Aperture |
>80% |
|
Beam Deviation |
< 3 minutes |
|
Transmission of p-polarization |
Tave > 90% |
|
Reflectance of s-polarization |
Rave > 99.8% |
|
Peak Transmission |
>45% |
|
Clear Aperture |
> 85% |
Beam Splitter: Broadband
Diameter: These Lenses Have Considerably Reduced Values Of Spherical Aberrations. Best Used To Replace Single Components Where Performance Must Be Improved.
Material: Combinations Of Two Optical Grade Glasses
Filter: Laserline
Diameter: Used In Pulsed Laser Systems For Purifying The Polarization State In Multimode Lasers.
Material: BK7