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PSM
Reflectance : Transmittance
Diameter φD
Thickness t
Parallelism
Transmittance at 550nm *
Transmittance at 400・700nm *
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Plate-type beamsplitters are dielectric multi-layer coatings on a parallel plate or a wedge substrate. They are designed to divide beams at a reflected light (R) : transmission light (T) ratio of 1:2 or 1:3. The rear surface is coated with anti-reflection (AR).

◦The dielectric multi-layer films have virtually zero light absorption and very low light intensity loss. However, transmittance and reflectance may vary according to wavelength, polarization and incident angles. Some deviation of the transmission optical path or ghosting may occur. To prevent ghosting, use wedge beamsplitters.

Related product
Products
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.
▶Please refer to here for Wavelength Characteristic Data (Reference Data, EXCEL file format).

Attention

▶The transmission curve on the graph is based on actual measurements and may vary from different production lots.
▶Surface flatness is the reflected wavefront distortion of the surface prior to coating.
▶Compared to precision parallel plate type splitters, wedged substrate type beam splitters can prevent ghosting caused by rear surface reflection and significantly increase the displacement of the optical path.
▶Dielectric multi-layer coated beamsplitters sometimes do not function effectively in specified R:T ratios. If this should occur, first check the polarization characteristics of the light source (laser). Do keep in mind that lasers used in the semiconductor field emit a linear polarized light.
▶Use only non-polarized light or circular polarized light as incident light for dielectric multi-layer coated beam splitters. Using polarized light may result in R:T ratios that vary according to polarization components.

Common Specifications
MaterialBK7
Surface flatnessλ/10
CoatingFront surface ; Dielectric multilayer coating
Rear surfaces ; Multilayer antireflection coating
Wavelength Range400 - 700nm
Incident angle45°
Laser Damage Threshold2.1J/cm2 (Laser pulse width ; 10ns , 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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Wedged Substrate

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Typical Transmittance Data
■PSM33

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T: Transmission
■PSM25

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T: Transmission
Spec
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Part Number
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    JP Yen Stock Qty
PSM33-25.4C03-10-550
PSM33-30C03-10-550
PSM33-30C05-10W-550
PSM25-25.4C03-10-550
PSM25-30C03-10-550
PSM25-30C05-10W-550

1:2

φ25.4mm

3mm

<5″

67±3%

<80%

1:2

φ30mm

3mm

<5″

67±3%

<80%

1:2

φ30mm

5mm

1°±5′

67±3%

<80%

1:3

φ25.4mm

3mm

<5″

75±3%

<90%

1:3

φ30mm

3mm

<5″

75±3%

<90%

1:3

φ30mm

5mm

1°±5′

75±3%

<90%

RoHS  

¥23,750

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US
RoHS  

¥23,750

CONTACT
US
RoHS  

¥23,750

LOW
RoHS  

¥23,750

IN STOCK
RoHS  

¥23,750

IN STOCK
RoHS  

¥23,750

LOW