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Beam Displacers

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These simple calcite components provide a means of separating polarized beams with constant displacement. The beam displacers are oriented with entrance and exit faces parallel and inclined at 48 to the optic axis to maximise the displacement.

Beam displacer

Displacement Factor

The displacement factor that relates the lateral offset to thickness varies from 013 to 009 over the usable spectral range 220nm - 2800nm.

Displacement factor

Custom Beam Displacer

For special applications, such as in fibre optic isolators, the thickness can be controlled to 10μm to match beam displacements to fibre core separations. When enquiring about a custom special, simply specify the aperture, beam separation and wavelength of operation. Contact us at sales@halbo.com, and we will send you a quotation by return.

Mounts

These displacers are supplied unmounted as free components unless mounting is specified at the time of ordering. The mount design is in the form of a simple tube with silicone rubber, giving access to the input and output beams. To specify mounted displacers, simply add suffix:

M2 for Type 2 mount (shown)
RM5 for Type 5 rotation mount

Beam displacer in M2 mount

Specifications

All Components
Spectral Range (nm)
220-2800
Peak Transmission (%)
92

 Model # Aperture (mm) Length (mm) Displacement (mm) Beam Dev. (min) Flatness @NaD Max Peak Power (MW/cm2) Max CW Power (W/cm2) Mount Dia. (mm) Mount Length (mm)
 10mm aperture
 BS10-20
10
20
2.0
<3
lambda/8
200
100
25.4
22
 BS10-30
10
30
3.0
<3
lambda/8
200
100
25.4
32
 BS10-40
10
40
4.0
<3
lambda/8
200
100
25.4
42
 BS10-50
10
50
5.0
<3
lambda/8
200
100
25.4
52
 BS10-60
10
60
6.0
<3
lambda/8
200
100
25.4
62
 12mm aperture
 BS12-20
12
20
2.0
<3
lambda/8
200
100
25.4
22
 BS12-30
12
30
3.0
<3
lambda/8
200
100
25.4
32
 BS12-40
12
40
4.0
<3
lambda/8
200
100
25.4
42
 BS12-50
12
50
5.0
<3
lambda/8
200
100
25.4
52
 BS12-60
12
60
6.0
<3
lambda/8
200
100
25.4
62
Stock List
View our current stock of Beam Displacers.
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