OptoSigma

CSCH
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Chromium cube half mirrors consist of two right angle prisms. One of them is coated with chromium (Cr) on the hypotenuse face. Half mirror divides input beam to reflectance and transmittance in 1:1. A beamsplitter of R:T=1:1 is called “Half Mirror”.

◦Four surfaces of the cube are coated with multi-layer anti-reflection coatings.
◦Approximately one third of the input beam is lost because of absorption of chromium coating on the hypotenuse. However these beamsplitters are not wavelength, polarization and incident angle of the input beam dependent and therefore provide a highly neutral reflectivity.
◦For cube beamsplitters, unlike plate beamsplitters, transmission beam deviations and ghosts rarely occur.

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Technical Data
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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.

Attention

▶Input beam from the prism side is indicated by a “○”.
▶Phase retardation of light input will not be preserved. Use a waveplate for phase compensation.
▶Wavelength dispersion of transmitted and reflected light is derived from refractive index and glass thickness and when diverging or introducing a focusing beam, chromatic aberration or spherical aberration may occur.
▶The transmittance curves are based on actual measurements and may vary with manufacturing lots.
▶The surface flatness is the reflected wavefront distortion of the surface before coating.
▶Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.

Common Specifications
MaterialBK7
Surface flatness of substrateλ/4
Beam Deviation<5′
CoatingHypotenuse surface ; Chromium
Four surfaces ; Multilayer antireflection coating
Incident angle
Transmittance
(Average P and S)
28±5% (average with respect to wavelength.)
Divergence ratio
(reflectance : transmittance)
1 : 1
Laser Damage Threshold0.3J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Surface Quality
(Scratch-Dig)
40−20
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
■CSCH-550

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T: Transmission
■CSCH-800

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T: Transmission
Spec
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Part Number
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    PRICE(USD) Stock Qty
CSCH-10-550
CSCH-15-550
CSCH-20-550
CSCH-25-550
CSCH-30-550
CSCH-40-550
CSCH-50-550
CSCH-10-800
CSCH-15-800
CSCH-20-800

400 - 700nm

10mm

400 - 700nm

15mm

400 - 700nm

20mm

400 - 700nm

25mm

400 - 700nm

30mm

400 - 700nm

40mm

400 - 700nm

50mm

750 - 850nm

10mm

750 - 850nm

15mm

750 - 850nm

20mm

RoHS  

$114.00

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$142.50

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$171.00

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US
RoHS  

$218.50

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$332.50

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$541.50

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US
RoHS  

$674.50

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RoHS  

$123.50

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RoHS  

$152.00

LOW
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$180.50

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