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BS4
Diameter φD
Thickness t
Parallelism
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A beam sampler behaves like a plate beamsplitter, it has the ability to reflect approximately 5.2% of the total beam.

◦Uncoated surface of optical parallels or wedged substrates are used as reflection surfaces. The rear surfaces are coated with multi-layer anti-reflection.
◦These products have transmitted beam deviation and ghosting of the rear surface reflections due to the characteristics of plate beamsplitters.
◦Wedged beam samplers with AR coating on the rear surface should be selected to prevent ghosting.

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Technical Data
Documents/Downloads
Guide

▶Please contact our Sales Division for customized products. (Customized on size, wavelength or R:T, etc.)
W3802
▶For a guarantee in reflected wavefront error or transmitted wavefront error, please contact our Sales Division with your requests.
▶Wedged types are marked with an arrow on the side of the substrate indicating the thickest point of the wedge.

Attention

▶The Beam Sampler has a reflectance of 5.2% when the material is BK7 and the input beam is unpolarized or circularly polarized.
▶The transmitted beam deviation of a wedged beamsplitter is larger then with a beamsplitter made of an optical parallel.
▶The amount of beam deviation of a beamsplitter depends on thickness of the substrate and the wavelength of the incident angle of the input beam.
▶Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.

Common Specifications
MaterialBK7
Surface flatnessλ/10
CoatingFront surface ; Uncoated
Rear surfaces ; Visble multilayer antireflection coating
Incident angle45°
Divergence ratio
(reflectance : transmittance)
5 : 95
(The average value of the P-Polarization and the S-Polarization)
Laser Damage Threshold4J/cm2 (Laser pulse width ; 4ns , Repetition frequency ; 20Hz)
Surface Quality
(Scratch-Dig)
10−5
Clear aperture90% of the diameter
Outline Drawing

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Schematic

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Optical Parallel

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Typical Reflectance Data (Calculated value)

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R: Reflectance ( Incidence angle 45°)
Wedged Substrate

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Reflectivity change in accordance with incident angle (Calculated value)

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R: Reflectance
Spec
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Part Number
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    JP Yen Stock Qty
BS4-25.4C03-10-550
BS4-30C03-10-550
BS4-30C05-10W-550
BS4-50C05-10-550
BS4-50C08-10W-550

400 - 700nm

φ25.4mm

3mm

<5″

400 - 700nm

φ30mm

3mm

<5″

400 - 700nm

φ30mm

5mm

1°±5′

400 - 700nm

φ50mm

5mm

<5″

400 - 700nm

φ50mm

8mm

1°±5′

RoHS  

¥10,000

CONTACT
US
RoHS  

¥11,400

IN STOCK
RoHS  

¥11,400

CONTACT
US
RoHS  

¥21,850

LOW
RoHS  

¥21,850

LOW