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Reflecting Beam Dividers/Combiners
The reflecting beam divider/combiner is constructed like a replica micro mirror array with 4 facet pairs per mm and a reflective aluminum coating, giving it broadband performance from 200 nm to the far infrared. The measurements at the visible wavelength and those in the IR differ only because of the inherent characteristics of aluminum. All data can be taken as representative within 2% and the reflected beams (RD) are equal to each other within ± 2%. This data is valid by the same margin for either or both polarizations.
The surfaces are ruled with equally spaced grooves of 4 per mm, producing the symmetrical triangular profile which permits good beam concentration. The facet surfaces of the grooves are highly reflective, allowing these divider/combiners to be used from the UV to the far infrared. These divider/combiners are recommended for dividing/combining broadband sources. Not recommended for imaging or interferometric applications.
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Reflecting Beam Dividers or Combiners
Ruled with equally spaced grooves of 4 per mm produces the symmetrical triangular profile which permits good beam concentration and gives it broadband performance from 200 nm to the far IR. |
| BEAM ANGLE Ө |
30° |
45° |
60° |
30° |
45° |
60° |
| SIZE (mm) |
25 x 25 |
25 x 25 |
25 x 25 |
50 x 50 |
50 x 50 |
50 x 50 |
| CATALOG NO. |
4-2430 |
4-2445 |
4-2460 |
4-5430 |
4-5445 |
4-5460 |
|
PRICE ($)* |
175.00 |
175.00 |
175.00 |
315.00 |
315.00 |
315.00 |
* Prices are in USD and are list prices only.
| |
6328A |
10.6μ |
| Ro |
Rc |
Ro |
Rc |
| Ө = 30° Beam Divider |
40% |
40% |
45% |
45% |
| Ө = 45° Beam Divider |
40% |
57% |
45% |
65% |
| Ө = 60° Beam Divider |
40% |
76% |
45% |
85% |
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Transmission Grating Beamsplitters
Transmission grating beamsplitters are commonly used for laser beam division and multiple laser line separation in visible wavelengths. The transmitted beam is diffracted into multiple orders. Optometrics’ transmission grating beamsplitters consist of an index matched epoxy replica on a polished glass substrate for a high total efficiency. These beamsplitters were designed specifically for useful division of He-Ne lasers. Several gratings are available offering different dispersion and power distributions. The diffraction angle for any wavelength may be calculated using the grating equation for normal incident light.
| General Specifications |
 Material |
- |
Schott B270 |
| Size |
- |
25 mm square maximum |
| Thickness |
- |
3 mm nominal |
| Tolerances |
- |
± 0.5 mm |
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Transmission Grating Beamsplitters
Used for He-Ne laser beam division and multiple laser line separation in visible wavelengths, the transmitted beam is diffracted into multiple orders. |
| He-Ne DIFFRACTED ORDER TYPICAL DISTRIBUTION @ 632.8 nm (%) |
12.7 x 12.7 mm CATALOG NO |
PRICE ($)* |
25 x 25 mm CATALOG NO |
PRICE ($)* |
| L/MM |
-2 |
-1 |
0 |
+1 |
+2 |
|
|
70 |
- |
- |
41 |
32 |
- |
4-1270 |
109.00 |
4-2570 |
229.00 |
|
80 |
5 |
25 |
25 |
25 |
5 |
4-1280 |
109.00 |
4-2580 |
229.00 |
|
92 |
- |
20 |
45 |
20 |
- |
4-1292 |
109.00 |
4-2592 |
229.00 |
| 110 |
- |
25 |
28 |
25 |
- |
4-1211 |
109.00 |
4-2511 |
229.00 |
* Prices are in USD and are list prices only.
COATINGS
Protective overcoatings that maintain or enhance reflectivity in the UV, Visible and IR regions are available for an additional charge.
| Gold Overcoat (AU-3) .......$60.00 each |
Aluminum Magnesium Fluoride (ALMG-3) ......$55.00 each | |
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Broadband Beamsplitter
45° Angle of Incidence |
 |
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Broadband Beamsplitter | Reflecting/Transmitting “Polka Dot” Beamsplitters
Optometrics offers a line of broadband beamsplitters with a nearly constant reflection to transmission ratio over the entire 250 to 2000 nm or 400 to 2000nm wavelength range. These beamsplitters consist of a UV grade fused silica or a B270 glass substrate with a vacuum deposited aluminum coating. The aluminum coating is applied in apertures giving the beamsplitter a “polka dot” appearance. Thus, the beam is split by reflection from the aluminized coating and transmitted through the non-aluminized portion of the substrate. These versatile beamsplitters are useful over a wide wavelength range and are negligibly angle sensitive, thus making it ideal to split the energy emitted from a radiant source.
| Specifications |
| Beam split ratio tolerance |
- |
± 5% |
| Minimum beam diameter for design split ratio |
- |
2 mm |
| Operating range |
- |
250 to 2000nm (on fused silica) |
| Coating pattern |
- |
Square coated apertures |
| *Substrate |
- |
UV grade fused silica or |
| |
|
B270 glass (VIS/NIR only) |
| Thickness |
|
1.5 mm nominal |
| Size tolerance |
|
+ 0.0 mm, - 0.5 mm |
| Design angle |
|
45° |
| Larger sizes available upon request |
“Polka Dot” Beamsplitters
Reflecting/Transmitting Beam Splitters on UV Grade Fused Silica |
| 90/10 |
4-9001 |
4-9002 |
4-9003 |
4-9004 |
4-9005 |
4-9006 |
4-9007 |
| 80/20 |
4-8011 |
4-8012 |
4-8013 |
4-8014 |
4-8015 |
4-8016 |
4-8017 |
| 70/30 |
4-7001 |
4-7002 |
4-7003 |
4-7004 |
4-7005 |
4-7006 |
4-7007 |
| 60/40 |
4-6001 |
4-6002 |
4-6003 |
4-6004 |
4-6005 |
4-6006 |
4-6007 |
| 50/50 |
4-0001 |
4-0002 |
4-0003 |
4-0004 |
4-0005 |
4-0006 |
4-0007 |
| 40/60 |
4-0461 |
4-0462 |
4-0463 |
4-0464 |
4-0465 |
4-0466 |
4-0467 |
| 30/70 |
4-0371 |
4-0372 |
4-0373 |
4-0374 |
4-0375 |
4-0376 |
4-0377 |
| 20/80 |
4-2001 |
4-2002 |
4-2003 |
4-2004 |
4-2005 |
4-2006 |
4-2007 |
| SIZE |
25.4 Dia. |
25.4 x 25.4 |
38.0 Dia. |
38.0 x 38.0 |
50.8 Dia. |
50.8 x 50.8 |
12.7 Dia. |
|
PRICE $* |
125.00 |
125.00 |
179.00 |
179.00 |
399.00 |
399.00 |
75.00 |
* Prices are in USD and are list prices only.
| Reflecting/Transmitting Beam Splitters on B270 Glass |
| 90/10 |
4-9101 |
4-9102 |
4-9103 |
4-9104 |
4-9105 |
4-9106 |
4-9107 |
| 80/20 |
4-8101 |
4-8102 |
4-8103 |
4-8104 |
4-8105 |
4-8106 |
4-8107 |
| 70/30 |
4-7101 |
4-7102 |
4-7103 |
4-7104 |
4-7105 |
4-7106 |
4-7107 |
| 60/40 |
4-6101 |
4-6102 |
4-6103 |
4-6104 |
4-6105 |
4-6106 |
4-6107 |
| 50/50 |
4-0101 |
4-0102 |
4-0103 |
4-0104 |
4-0105 |
4-0106 |
4-0107 |
| 40/60 |
4-4161 |
4-4162 |
4-4163 |
4-4164 |
4-4165 |
4-4166 |
4-4167 |
| 30/70 |
4-3101 |
4-3102 |
4-3103 |
4-3104 |
4-3105 |
4-3106 |
4-3107 |
| 20/80 |
4-2101 |
4-2102 |
4-2103 |
4-2104 |
4-2105 |
4-2106 |
4-2107 |
| SIZE |
25.4 Dia. |
25.4 x 25.4 |
38.0 Dia. |
38.0 x 38.0 |
50.8 Dia. |
50.8 x 50.8 |
12.7 Dia. |
|
PRICE $* |
95.00 |
95.00 |
139.00 |
139.00 |
249.00 |
249.00 |
50.00 |
* Prices are in USD and are list prices only.
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