Superachromatic Quartz and MgF2 Retarders

The retarders are produced with a path difference of λ/2 or λ/4. Each retarder consists of three pairs of quartz and MgF2 plates cemented to each other. The deviation is up to about 2'.
The standard version has a calculated path difference (R) of λ/2 ± 1.3% or λ/4 ± 4% in the spectral range of 310 to 1100 nm. In the entire wavelength range the orientation of the fast axis (Ψ) changes ± 2° with the λ/2 plate or ± 1.5°with the λ/4 plate. The 6 crystal plates are cemented with cover plates made from fused silica Suprasil. The outer surfaces are single-layer antireflection coated.
The retarders in the spectral range of 600 - 2700 nm have a calculated path difference of λ/2 ± 0.04% or λ/4 ± 0.25%. The orientation of the optical axis changes ±  0.2° with the λ/2 plate and ±  0.1° with the λ/4 plate. The retarders for this range are delivered without cover plates. The outer surfaces are single-layer antireflection coated.
During manufacturing it is possible to achieve the theoretical retardation (see curves) to an accuracy of about 3%.
This type of retardation plates can be specially ordered for other wavelengths.

Aperture Holder 310 nm - 1100 nm
Ø Ø λ/2 λ/4
Ordernr. Price 1 pc. Price 2-5 pc. Price 6-10 pc. Ordernr. Price 1 pc. Price 2-5 pc. Price 6-10 pc.
 9.5 mm
14.5 mm
19.5 mm
24.5 mm
25 mm
25 mm
30 mm
40 mm
RSU 1.2.10
RSU 1.2.15
RSU 1.2.20
RSU 1.2.25
€ 2142
€ 3183
€ 5724
€ 6938
€ 1933
€ 2935
€ 5051
€ 5947
€ 1656
€ 2626
€ 4281
€ 5286
RSU 1.4.10
RSU 1.4.15
RSU 1.4.20
RSU 1.4.25
€ 2251
€ 3347
€ 6061
€ 8425
€ 2068
€ 3168
€ 5388
€ 6938
€ 1825
€ 2820
€ 4618
€ 5947

Aperture Holder 600 nm - 2700 nm
Ø Ø λ/2 λ/4
Ordernr. Price 1 pc. Price 2-5 pc. Price 6-10 pc. Ordernr. Price 1 pc. Price 2-5 pc. Price 6-10 pc.
  9.5 mm
14.5 mm
19.5 mm
24.5 mm
25 mm
25 mm
30 mm
40 mm
RSU 2.2.10
RSU 2.2.15
RSU 2.2.20
RSU 2.2.25
€ 1991
€ 3066
€ 5242
€ 6515
€ 1820
€ 2827
€ 4587
€ 5646
€ 1593
€ 2529
€ 3838
€ 5067
RSU 2.4.10
RSU 2.4.15
RSU 2.4.20
RSU 2.4.25
€ 2157
€ 3406
€ 5897
€ 7721
€ 1982
€ 3089
€ 5242
€ 6756
€ 1749
€ 2691
€ 4493
€ 6113

The retarders are supplied in a cylindrical mount engraved with the average direction of the axis, the path difference and the wavelength range.

Diagramsto top

310-1100nm/Lambda/2-Diagramm(3k)

310-1100nm/Lambda/4-Diagramm(3k)

600-2700nm/Lambda/2-Diagramm(3k)

600-2700nm/Lambda/4-Diagramm(3k)

Literatureto top

  • K. Serkowsky, Methods of Experimental PhysicsVol 12: Astrophysics, Part A, N. P. Carleton, Hrsg, (1974), S.361
  • J. E. Frecker, K. Serkowsky, Applied Optics 15,(1976), S.605 "Linear Polarimeter with Rapid Modulation, Achromatic in the 0,3 - 1,1 µm range"
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