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Photonics West
27.01.- 01.02.2018
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Photonics West in San Francisco
Booth 4529


Kösters Interference Double Prisms

Kösters Interference Double Prisms

The prisms are made of fused silica (Homosil) and consist of two identical cemented prisms The angles of these prisms are 30° - 60° - 90°. The long cathetus of one of the prisms is coated with a partially reflecting protected silver layer for the visible spectral range.

A Kösters prisms generates two parallel output beams. It allows a simple realization of a white light interferometer having exactly equal optical length in both arms.

Optical specifications

material fused silica
spectral range 400-700 nm
splitting ratio (unpolarized) 45:45 (±5) %
Polarisationsempfindlichkeit |Rs-Rp|<5%
absorption loss ca. 10%
flatness the surfaces <λ/10
angular tolerance ±1'
angular equality of the prisms ±1''
connection of the prisms cemented

Standard dimensions

side length
20 mm 30 mm 40 mm 60 mm 100mm
height [mm] 10 15 20 30 50
useable diameter [mm²] 9,0 x 9,0 14,0 x 14,0 19,0 x 19,0 28,0 x 28,0 48,0 x 18,0
long cathetus [mm] 17 26 34 52 86
Art. No.
IKP 020 IKP 030 IKP 040 IKP 060 IKP 100

Prices

Art.-No. 1 pieces in € 2-5 pieces in € 6-10 pieces in €
IKP 020 1500,- 1400,- 1306,-
IKP 030 1963,- 1834,- 1710,-
IKP 040 2337,- 2182,- 2036,-
IKP 060 3126,- 2869,- 2653,-
IKP 100 6900,- 6103,- 5556,-

Price custom version

AR-Coating the Ein- und Austrittsflächen auf Anfrage




Dielektrische Teilerschicht (absorptionsfrei) auf Anfrage




Prismenkombinationen for anthee Interferometer auf Anfrage