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Plate beamsplitters

Description

Plate beamsplitters are considerably lighter and cheaper than the traditional cubes, and avoid the problem of stray light back-reflected from the entry and exit faces. Our Precision and Standard ranges both have dielectric multilayer coatings giving excellent durability and neutrality and much less affected by temperature changes than ordinary evaporated coatings. The spurious reflection from the back surface is almost eliminated by multilayer AR coating.

The Precision range comprises optically polished BK7 substrates flat to λ/4: these are suitable for all but the most exacting imaging applications. Plates in the Standard range are prepared as large sheets, allowing us to offer a wide range of good quality (satisfactory for most purposes) at a very reasonable cost. We can also provide special sizes, both larger and smaller, at very short notice. The Economy range has a single-layer dielectric (TiO2) beamsplitting coating, without AR on the reverse, and offers very large sizes at low cost.

Coating Specification

Angle

45o

 Visible 50%

  Reflectance

50 ± 5% 

  Wavelength

450-700nm

  AR Coating

R < 1.2% average

Visible 33%

  Reflectance

33 ± 5%

  Wavelength

450-700nm

  AR coating

R < 0.6% average

VIS/NIR 50%

  Reflectance

50 ± 6%

  Wavelength

530-1070nm

  AR coating

R < 0.9% average

NIR/Telecom 50%

  Reflectance

50 ± 5%

  Wavelength

1070-1650nm

  AR coating

R < 0.6% average

Economy

  Reflectance

40% nom. (visible)

Polarisation ratio                         

Rs/Rp = 2 (approx. for all types)


Substrate specification

Precision range:

  Flatness (both sides)

λ/4 over 90% of aperture size

  Diameter

+0, -0.1mm

  Length, width

±0.1mm

  Thickness

±0.1mm

  Scratch-dig

60-40 see Specifications for details

  Material

BK7 see Optical materials for details

Standard and Economy ranges:

  Flatness (typical):

  1mm thick

0.5-1.5λ over Ø10mm

  3mm thick

1-2λ over Ø25mm

  Diameter

+0, -0.2mm

  Length, width

±0.3mm (≤100mm)

±0.5mm (>100mm)

  Thickness

±0.2mm

  Scratch-dig

60-40 see Specifications for details

  Material

B270(NIR range)

Float glass (others)

For more details of your modification needs please enquire.

  • Highly efficient, hard, all-dielectric coatings
  • All (except Economy range) multi AR coated on the back surface
 
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Item code Size (mm)Thickness (mm)Wavelength range (nm)ReflectivityRangeFlatness Price per item
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16 BQ 10 16 x 103450-700nm (visible)50%Precisionλ/4 (90% aper.) £44.89
 
 
 
 
 
63 BN 40 63 x 403530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £66.31
 
 
 
 
 
16 BX 10 16 x 1031070-1650nm (NIR/ telecom)50%Precisionλ/4 (90% aper.) £51.30
 
 
 
 
 
25 BX 00 25 dia.41070-1650nm (NIR/ telecom)50%Precisionλ/4 (90% aper.) £66.91
 
 
 
 
 
25 BX 16 25 x 1641070-1650nm (NIR/ telecom)50%Precisionλ/4 (90% aper.) £60.86
 
 
 
 
 
40 BX 25 40 x 2561070-1650nm (NIR/ telecom)50%Precisionλ/4 (90% aper.) £92.20
 
 
 
 
 
50 BX 00 50 dia.61070-1650nm (NIR/ telecom)50%Precisionλ/4 (90% aper.) £120.27
 
 
 
 
 
63 BX 40 63 x 4081070-1650nm (NIR/ telecom)50%Precisionλ/4 (90% aper.) £138.79
 
 
 
 
 
10 BV 06 10 x 6.31.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 £18.03
 
 
 
 
 
100 BV 63 100 x 631.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 TBA
 
 
 
 
 
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16 BV 10 16 x 101.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 TBA
 
 
 
 
 
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25 BV 00 25 dia.1.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 £30.98
 
 
 
 
 
25 BV 16 25 x 161.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 £22.75
 
 
 
 
 
40 BV 25 40 x 251.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 TBA
 
 
 
 
 
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63 BV 40 63 x 401.1450-700nm (visible)50%Standard0.5-1.5λ per Ø10 TBA
 
 
 
 
 
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10 BJ 06 10 x 6.31.1530-1070nm (visible/ NIR)50%Standard0.5-1.5λ per Ø10 £23.11
 
 
 
 
 
40 BN 25 40 x 253530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £44.77
 
 
 
 
 
25 BN 16 25 x 163530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £31.58
 
 
 
 
 
25 BQ 00 25 dia.4450-700nm (visible)50%Precisionλ/4 (90% aper.) £53.24
 
 
 
 
 
25 BQ 16 25 x 164450-700nm (visible)50%Precisionλ/4 (90% aper.) £51.79
 
 
 
 
 
40 BQ 25 40 x 256450-700nm (visible)50%Precisionλ/4 (90% aper.) £78.41
 
 
 
 
 
50 BQ 00 50 dia.6450-700nm (visible)50%Precisionλ/4 (90% aper.) £102.25
 
 
 
 
 
63 BQ 40 63 x 408450-700nm (visible)50%Precisionλ/4 (90% aper.) £117.61
 
 
 
 
 
16 BI 10 16 x 103530-1070nm (visible/ NIR)50%Precisionλ/4 (90% aper.) £51.30
 
 
 
 
 
25 BI 00 25 dia.4530-1070nm (visible/ NIR)50%Precisionλ/4 (90% aper.) TBA
 
 
 
 
 
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25 BI 16 25 x 164530-1070nm (visible/ NIR)50%Precisionλ/4 (90% aper.) £60.86
 
 
 
 
 
40 BI 25 40 x 256530-1070nm (visible/ NIR)50%Precisionλ/4 (90% aper.) £92.20
 
 
 
 
 
50 BI 00 50 dia.6530-1070nm (visible/ NIR)50%Precisionλ/4 (90% aper.) £120.27
 
 
 
 
 
63 BI 40 63 x 408530-1070nm (visible/ NIR)50%Precisionλ/4 (90% aper.) £138.79
 
 
 
 
 
10 BN 06 10 x 6.33530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £23.11
 
 
 
 
 
100 BN 63 100 x 633530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £114.10
 
 
 
 
 
16 BN 10 16 x 103530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £24.68
 
 
 
 
 
25 BN 00 25 dia.3530-1070nm (visible/ NIR)50%Standard1-2λ per Ø25 £44.77
 
 
 
 
 
16 BJ 10 16 x 101.1530-1070nm (visible/ NIR)50%Standard0.5-1.5λ per Ø10 £24.68
 
 
 
 
 
25 BJ 00 25 dia.1.1530-1070nm (visible/ NIR)50%Standard0.5-1.5λ per Ø10 £44.77
 
 
 
 
 
25 BJ 16 25 x 161.1530-1070nm (visible/ NIR)50%Standard0.5-1.5λ per Ø10 £31.58
 
 
 
 
 
100 BD 63 100 x 633450-700nm (visible)33%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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16 BD 10 16 x 103450-700nm (visible)33%Standard1-2λ per Ø25 £18.03
 
 
 
 
 
25 BD 00 25 dia.3450-700nm (visible)33%Standard1-2λ per Ø25 £30.98
 
 
 
 
 
25 BD 16 25 x 163450-700nm (visible)33%Standard1-2λ per Ø25 £22.75
 
 
 
 
 
40 BD 25 40 x 253450-700nm (visible)33%Standard1-2λ per Ø25 £30.98
 
 
 
 
 
63 BD 40 63 x 403450-700nm (visible)33%Standard1-2λ per Ø25 £45.25
 
 
 
 
 
10 BL 06 10 x 6.331070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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100 BL 63 100 x 6331070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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16 BL 10 16 x 1031070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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25 BL 00 25 dia.31070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 £44.77
 
 
 
 
 
25 BL 16 25 x 1631070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 £31.58
 
 
 
 
 
40 BL 25 40 x 2531070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 £44.77
 
 
 
 
 
63 BL 40 63 x 4031070-1650nm (NIR/ telecom)50%Standard1-2λ per Ø25 £66.31
 
 
 
 
 
100 BT 63 100 x 633450-700nm (visible)40% nom.Economy1-2λ per Ø25 £46.22
 
 
 
 
 
160 BT 100 160 x 1003450-700nm (visible)40% nom.Economy1-2λ per Ø25 TBA
 
 
 
 
 
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10 BD 06 10 x 6.33450-700nm (visible)33%Standard1-2λ per Ø25 £18.03
 
 
 
 
 
63 BA 40 63 x 403450-700nm (visible)50%Standard1-2λ per Ø25 £45.25
 
 
 
 
 
40 BJ 25 40 x 251.1530-1070nm (visible/ NIR)50%Standard0.5-1.5λ per Ø10 £44.77
 
 
 
 
 
10 BW 06 10 x 6.31.11070-1650nm (NIR/ telecom)50%Standard0.5-1.5λ per Ø10 £23.11
 
 
 
 
 
16 BW 10 16 x 101.11070-1650nm (NIR/ telecom)50%Standard0.5-1.5λ per Ø10 TBA
 
 
 
 
 
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25 BW 00 25 dia.1.11070-1650nm (NIR/ telecom)50%Standard0.5-1.5λ per Ø10 £44.77
 
 
 
 
 
25 BW 16 25 x 161.11070-1650nm (NIR/ telecom)50%Standard0.5-1.5λ per Ø10 £31.58
 
 
 
 
 
40 BW 25 40 x 251.11070-1650nm (NIR/ telecom)50%Standard0.5-1.5λ per Ø10 £44.77
 
 
 
 
 
10 BA 06 10 x 6.33450-700nm (visible)50%Standard1-2λ per Ø25 £18.03
 
 
 
 
 
100 BA 63 100 x 633450-700nm (visible)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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16 BA 10 16 x 103450-700nm (visible)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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160 BA 100 160 x 1003450-700nm (visible)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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25 BA 00 25 dia.3450-700nm (visible)50%Standard1-2λ per Ø25 £30.98
 
 
 
 
 
25 BA 16 25 x 163450-700nm (visible)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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40 BA 00 40 dia.3450-700nm (visible)50%Standard1-2λ per Ø25 £40.78
 
 
 
 
 
40 BA 25 40 x 253450-700nm (visible)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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50 BA 00 50 dia.3450-700nm (visible)50%Standard1-2λ per Ø25 TBA
 
 
 
 
 
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250 BT 160 250 x 1603450-700nm (visible)40% nom.Economy1-2λ per Ø25 TBA
 
 
 
 
 
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