Broadband Beam Samplers

Uncoated front surface for beam sampling
Fresnel reflectance from 1–10% at 45°
AR coated back surface eliminates ghosting
Slight wedge virtually eliminates internal fringes
BK 7 or UV fused silica substrates

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Overview
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Our broadband beam samplers are designed to split off, or sample, a beam by Fresnel reflection for beam monitoring applications where minimum disturbance of the transmitted beam is necessary. The precision optical substrate is uncoated on the front surface to achieve beam division by Fresnel reflection. The back surface is antireflection coated to prevent ghosting. A slight wedge in the substrate virtually eliminates internal fringes. Depending on the polarization of the incident beam, front surface reflectance from 1–10% can be attained at 45° incidence.

These beam samplers 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	BK7, grade A, fine annealed optical glass UV grade fused silica
Surface Flatness	Specification below at 632.8 nm over the clear aperture fringes
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°
Surface S₁	Uncoated, Fresnel reflection from uncoated substrate
Antireflection Coating, S₂	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, 1 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
10B10	25.4	6.10	Grade A BK7	λ/5	20-10
10B20	1.0 (25.4)	6.10	Grade A BK7	λ/10	15-5 scratch-dig
10Q20	1.0 (25.4)	6.10	UV Grade Fused Silica	λ/10	15-5 scratch-dig
10Q40	1.0 (25.4)	6.10	UV Grade Fused Silica	λ/20	10-2 scratch-dig
20B10	50.8	9.40	BK 7	λ/5	20-10
20B20	2.0 (50.8)	9.40	Grade A BK7	λ/10	15-5 scratch-dig
20Q20	2.0 (50.8)	9.40	UV Grade Fused Silica	λ/10	15-5 scratch-dig
20Q40	2.0 (50.8)	9.40	UV Grade Fused Silica	λ/20	10-2 scratch-dig
30B10	76.2	12.45	BK 7	λ/5	20-10
30Q20	76.2	12.45	UVFS	λ/10	15-5
30Q40	76.2	12.45	UVFS	λ/20	10-2

Coatings

Wavelength Range (nm)	Reflectivity per Surface	Angle of Incidence	Coating Code
440–700	R_avg <0.75 %	45°	NC.1
660–1000	R_avg <0.75 %	45°	NC.2
1010–1550	R_avg <0.75 %	45°	NC.3

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
10B10NC.2	BK 7 Broadband Beam Sampler, 25.4 Dia, 6.10mm, λ/5, 660-1000nm	0	In Stock	119	$119.00	ADD
10B10NC.3	BK 7 Broadband Beam Sampler, 25.4 Dia, 6.10mm, λ/5, 1010-1550nm	0	In Stock	147	$147.00	ADD
10B20NC.1	Broadband Beam Sampler, BK7, 25.4 mm Diameter, λ/10, 440-700 nm	0	In Stock	140	$140.00 $175.00	ADD
10B20NC.2	Broadband Beam Sampler, BK7, 25.4 mm Diameter, λ/10, 660-1000 nm	0	In Stock	140	$140.00 $175.00	ADD
10B20NC.3	Broadband Beam Sampler, BK7, 25.4 mm Diameter, λ/10, 1010-1550 nm	0	In Stock	137	$137.79 $215.00	ADD
10Q20NC.1	Broadband Beam Sampler, UVFS, 25.4 mm Diameter, λ/10, 440-700 nm	9	9 Weeks	155	$155.00	ADD
10Q20NC.2	Broadband Beam Sampler, UVFS, 25.4 mm Diameter, λ/10, 660-1000 nm	0	In Stock	159	$159.00 $230.00	ADD
10Q20NC.3	Broadband Beam Sampler, UVFS, 25.4 mm Diameter, λ/10, 1010-1550 nm	0	In Stock	155	$155.00 $252.00	ADD
10Q40NC.1	Broadband Beam Sampler, UVFS, 25.4 mm Diameter, λ/20, 440-700 nm	99	Call	310	$310.00	ADD
10Q40NC.2	Broadband Beam Sampler, UVFS, 25.4 mm Diameter, λ/20, 660-1000 nm	0	In Stock	319	$319.00	ADD
10Q40NC.3	Broadband Beam Sampler, UVFS, 25.4 mm Diameter, λ/20, 1010-1550 nm	0	In Stock	339	$339.00	ADD
20B10NC.3	BK 7 Broadband Beam Sampler, 50.4 Dia, 9.40mm, λ/5, 1010-1550nm	0	In Stock	247	$247.00	ADD
20B20NC.1	Broadband Beam Sampler, BK7, 50.8 mm Diameter, λ/10, 440-700 nm	0	In Stock	303	$303.00	ADD
20B20NC.2	Broadband Beam Sampler, BK7, 50.8 mm Diameter, λ/10, 660-1000 nm	0	In Stock	303	$303.00	ADD
20B20NC.3	Broadband Beam Sampler, BK7, 50.8 mm Diameter, λ/10, 1010-1550 nm	0	In Stock	371	$371.00	ADD
20Q20NC.1	Broadband Beam Sampler, UVFS, 50.8 mm Diameter, λ/10, 440-700 nm	0	In Stock	425	$425.00	ADD
20Q20NC.2	Broadband Beam Sampler, UVFS, 50.8 mm Diameter, λ/10, 660-1000 nm	4	4 Weeks	425	$425.00	ADD
20Q20NC.3	Broadband Beam Sampler, UVFS, 50.8 mm Diameter, λ/10, 1010-1550 nm	0	In Stock	425	$425.00	ADD
20Q40NC.1	Broadband Beam Sampler, UVFS, 50.8 mm Diameter, λ/20, 440-700 nm	0	In Stock	536	$536.00	ADD
20Q40NC.2	Broadband Beam Sampler, UVFS, 50.8 mm Diameter, λ/20, 660-1000 nm	99	Call	537	$537.00	ADD
20Q40NC.3	Broadband Beam Sampler, UVFS, 50.8 mm Diameter, λ/20, 1010-1550 nm	0	In Stock	537	$537.00	ADD
30B10NC.2	BK 7 Broadband Beam Sampler, 76.2 Dia, 12.45mm, λ/5, 660-1000nm	0	In Stock	342	$342.00	ADD
30B10NC.3	BK 7 Broadband Beam Sampler, 76.2 Dia, 12.45mm, λ/5, 1010-1550nm	0	In Stock	377	$377.00	ADD
30Q40NC.3	Fused Silica Broadband Beam Sampler, 76.2 Dia,12.45mm, λ/20, 1010-1550nm	0	In Stock	1112	$1,112.00	ADD
5801	Beam Pick-Off Optic, 1.0 in. Diameter, BK 7	0	In Stock	124	$124.00	ADD
5802	Beam Pick-Off Optic, 2.0 in. Diameter, BK 7	0	In Stock	199	$199.00	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

CAD Files

5801c-Drawing (24 KB)
5802c-Drawing (25 KB)

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Broadband Beam Samplers

Specifications

Coatings

CAD Files

Newport Resource e-Catalogs *

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