Broadband Dielectric Beamsplitters

S-polarized beams split R/T = 50/50
P-polarized beams split R/T = 30/70
AR coated back surface eliminates ghosting
Slight wedge virtually eliminates internal fringes
BK 7 or UV fused silica substrates

< >

Overview
Specifications
Ordering
Drawings
Literature & Downloads

Our broadband dielectric beamsplitters are designed to provide general purpose laser beamsplitting and combining for visible through near infrared applications. Each coating is essentially achromatic across a wide spectral band so that a single optic will work for the entire range of a particular tunable laser, for several laser diode wavelengths, or for most visible laser wavelengths. The precision optical substrate has a dielectric beamsplitter coating on the front surface. The back surface is antireflection coated to prevent ghosting. A slight wedge in the substrate virtually eliminates internal fringes. S-polarized beams will be equally split with R/T = 50/50 at 45° incidence.

A p-polarized beam yields a split of R/T = 30/70. In unpolarized light, the performance is typically R/T = 40/60. These beamplitters are available in either BK 7 for general use, or UV grade fused silica for optimal wavefront and thermal stability. Coating options cover the visible to near infrared regions.

Specifications

Material	BK 7, grade A, fine annealed optical glass UV grade fused silica
Surface Flatness	Specification below at 632.8 nm over the clear aperture
Clear Aperture	>central 80% of diameter
Diameter Tolerance	+0/-0.13 mm
Thickness Tolerance	±0.38 mm
Wedge	30 ±15 arc min
Chamfers	25.4 mm: 0.25-0.76 mm face width x 45° ±15° 50.8 mm & 76.2 mm: 0.38-1.14 mm face width x 45° ±15°
Beamsplitter S₁ Coating	R_s= 50% ±5%, R_p ≤R_s at 45° over the specified wavelength range
Antireflection S₂ Coating	Multilayer coating, R_avg ≤0.75% at 45° over the specified wavelength range
Durability	MIL-C-675C
Cleaning	Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (see Care and Cleaning of Optics)
Damage Threshold	500 W/cm² CW, 0.5 J/cm² with 10 nsec pulses, typical

Model	Diameter (mm)	Thickness (mm)	Material	Surface Flatness	Surface Quality
Model	Diameter (mm)	Thickness (mm)	Material	Surface Flatness	Surface Quality
10B20	25.4	6.1	Grade A BK7	λ/10	15-5
10Q20	25.4	6.1	UV Grade Fused Silica	λ/10	15-5
10Q40	25.4	6.1	UV Grade Fused Silica	λ/20	10-2
20B20	50.8	9.4	Grade A BK7	λ/10	15-5
20Q20	50.8	9.4	UV Grade Fused Silica	λ/10	15-5
20Q40	50.8	9.4	UV Grade Fused Silica	λ/20	10-2
30Q20	76.2	12.45	UV Grade Fused Silica	λ/10	15-5
30Q40	76.2	12.45	UV Grade Fused Silica	λ/20	10-2

Coatings

Wavelength Range (nm)	Reflectivity	Angle of Incidence	Coating Code
480–700	R_s = 50 %	45°	BS.1
700–950	R_s = 50 %	45°	BS.2
1290–1580	R_s = 50 %	45°	BS.3

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
10B20BS.1	Broadband Dielectric Beamsplitter, BK7, 25.4 mm Diameter, λ/10, 480-700 nm	0	In Stock	155	$155.00 $205.00	ADD
10B20BS.2	Broadband Dielectric Beamsplitter, BK7, 25.4 mm Diameter, λ/10, 700-950 nm	0	In Stock	155	$155.00 $205.00	ADD
10B20BS.3	Broadband Dielectric Beamsplitter, BK7, 25.4 mm Diameter, λ/10, 1290-1580 nm	0	In Stock	158	$158.99 $255.00	ADD
10Q20BS.1	Broadband Dielectric Beamsplitter, UVFS, 25.4 mm Diameter, λ/10, 480-700 nm	0	In Stock	175	$175.00 $280.00	ADD
10Q20BS.2	Broadband Dielectric Beamsplitter, UVFS, 25.4 mm Diameter, λ/10, 700-950 nm	8	8 Weeks	175	$175.00	ADD
10Q20BS.3	Broadband Dielectric Beamsplitter, UVFS, 25.4 mm Diameter, λ/10, 1290-1580 nm	0	In Stock	175	$175.00 $330.00	ADD
10Q40BS.1	Broadband Dielectric Beamsplitter, UVFS, 25.4 mm Diameter, λ/20, 480-700 nm	0	In Stock	355	$355.00	ADD
10Q40BS.2	Broadband Dielectric Beamsplitter, UVFS, 25.4 mm Diameter, λ/20, 700-950 nm	0	In Stock	355	$355.00	ADD
10Q40BS.3	Broadband Dielectric Beamsplitter, UVFS, 25.4 mm Diameter, λ/20, 1290-1580 nm	0	In Stock	410	$410.00	ADD
20B20BS.1	Broadband Dielectric Beamsplitter BK7, 50.8 mm Diameter, λ/10, 480-700 nm	0	In Stock	345	$345.00	ADD
20B20BS.2	Broadband Dielectric Beamsplitter, BK7, 50.8 mm Diameter, λ/10, 700-950 nm	6	6 Weeks	345	$345.00	ADD
20B20BS.3	Broadband Dielectric Beamsplitter, BK7, 50.8 mm Diameter, λ/10, 1290-1580 nm	0	In Stock	444	$444.00	ADD
20Q20BS.1	Broadband Dielectric Beamsplitter, UVFS, 50.8 mm Diameter, λ/10, 480-700 nm	0	In Stock	476	$476.00	ADD
20Q20BS.2	Broadband Dielectric Beamsplitter, UVFS, 50.8 mm Diameter, λ/10, 700-950 nm	0	In Stock	476	$476.00	ADD
20Q20BS.3	Broadband Dielectric Beamsplitter, UVFS, 50.8 mm Diameter, λ/10, 1290-1580 nm	0	In Stock	583	$583.00	ADD
20Q40BS.1	Broadband Dielectric Beamsplitter, UVFS, 50.8 mm Diameter, λ/20, 480-700 nm	0	In Stock	557	$557.00	ADD
20Q40BS.2	Broadband Dielectric Beamsplitter, UVFS, 50.8 mm Diameter, λ/20, 700-950 nm	0	In Stock	557	$557.00	ADD
20Q40BS.3	Broadband Dielectric Beamsplitter, UVFS, 50.8 mm Diameter, λ/12, 1290-1580 nm	0	In Stock	557	$557.00	ADD
30Q20BS.1	Broadband Dielectric Beamsplitter, UVFS, 76.2 mm Diameter, λ/10, 480-700 nm	0	In Stock	912	$912.00	ADD
30Q20BS.2	Broadband Dielectric Beamsplitter, UVFS, 76.2 mm Diameter, λ/10, 700-950 nm	0	In Stock	912	$912.00	ADD
30Q20BS.3	Broadband Dielectric Beamsplitter, UVFS, 76.2 mm Diameter, λ/10, 1290-1580 nm	2	2 Weeks	993	$993.00	ADD
30Q40BS.1	Fused Silica Dielectric Beamsplitter, 76.2 Dia, 12.45mm, λ/20, 480-700nm	0	In Stock	1207	$1,207.00	ADD
30Q40BS.2	Fused Silica Dielectric Beamsplitter, 76.2 Dia, 12.45mm, λ/20, 700-950nm	99	Call	1207	$1,207.00	ADD
30Q40BS.3	Fused Silica Dielectric Beamsplitter, 76.2 Dia, 12.45mm, λ/20,1290-1580nm	99	Call	1305	$1,305.00	ADD

	Dimension (mm)
Model	øA	øB	C
10B/10Q	25.4	20.3	6.10
20B/20Q	50.8	40.6	9.40
30B/30Q	76.2	61.0	12.45

Newport Resource e-Catalogs *

*e-Catalog pages include the most current information available at the time of printing.

Broadband Dielectric Beamsplitters

Specifications

Coatings

Newport Resource e-Catalogs *

Newport Family of Brands