Beam Splitters - Reflecting Beam Dividers

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Beam Splitters

—	Reflecting Beam Dividers/Combiners
—	Transmission Grating Beamsplitters
—	Reflecting/Transmitting “Polka Dot” Beamsplitters

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.

General Specifications

Operating range	-	UV to far infrared
Spacing	-	4 per mm
Groove profile	-	Symmetrical
Substrate	-	Pyrex
Efficiency	-	Typically 80%
Standard angles	-	30°, 45°, 60°
Damage threshold:
pulsed	-	350 milli-joules/cm² @ 200 nsec.
CW	-	40 watts/cm²
Standard sizes	-	25 mm sq., 50 mm sq.
Thickness	-	6.0 mm ± 0.5 mm

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
	R_o	R_c	R_o	R_c
Ө = 30° Beam Divider	40%	40%	45%	45%
Ө = 45° Beam Divider	40%	57%	45%	65%
Ө = 60° Beam Divider	40%	76%	45%	85%

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

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

Broadband Beamsplitter
45° Angle of Incidence

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.

Optometrics 8 Nemco Way, Stony Brook Industrial Park, Ayer, MA 01432 USA
Phone: (978) 772-1700 Fax: (978) 772-0017