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CSM
Reflectance : Transmittance
A=B=C
Transmittance at 550nm *
Transmittance at 400・700nm *
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Cube beamsplitters with dielectric multi-layer coated on the hypotenuse face of a 45° right angle prism. Divides beams at reflected light (R): transmission light (T) ratio of 1:2 or 1:3.

◦Anti-reflection coating (AR coat) is applied to the incident and outgoing faces.
◦The dielectric multi-layer films has virtually zero light absorption and very low light intensity loss. However, transmittance and reflectance may change according to wavelength, polarization and incident angles.
◦In contrast to plate type half mirrors, cube mirrors have no ghosting or transmission optical path deviation.

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

Attention

▶Input beam from the prism side is indicated by a “○”(hypotenuse coated side).
▶The transmission curve on the graph is based on actual measurements and may vary from different production lots.
▶Phase retardation of inputting light will not be preserved. Please use waveplate for phase compensation.
▶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.
▶Dielectric multi-layer coated cube half mirrors sometimes do not function effectively. If this should occur, first check the polarization characteristics of the light source (laser) and keep in mind that lasers used in the semiconductor field emit a linear polarized light.

Common Specifications
MaterialBK7
Surface flatness of substrateλ/4
Wavelength Range400 - 700nm
Beam Deviation<5′
CoatingHypotenuse surface ; Dielectric multilayer coating
Rear surfaces ; Multilayer antireflection coating
Incident angle
Polarization of the incidentUnpolarized light or 45-degrees Linear polarization or Circular polarization
Laser Damage Threshold0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality
(Scratch-Dig)
10-20
Clear apertureCircle that inscribed in a square of 85% of the dimensions
Outline Drawing

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Schematic

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Typical Transmittance Data
■CSM33

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T: Transmission
■CSM25

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T: Transmission

Part Number

Catalog PDF

dxf

STP

IGS

SAT

Zemax

CSM33-10-550

CSM33-20-550

CSM25-10-550

CSM25-20-550

Spec
Compare
Part Number
Add to cart Cart
    JP Yen Stock Qty
CSM33-10-550
CSM33-20-550
CSM25-10-550
CSM25-20-550

1:2

10mm

67±5%

<80%

1:2

20mm

67±5%

<80%

1:3

10mm

75±5%

<90%

1:3

20mm

75±5%

<90%

RoHS  

¥19,950

IN STOCK
RoHS  

¥26,600

IN STOCK
RoHS  

¥19,950

LOW
RoHS  

¥26,600

LOW