Mica Retarders
Mica retarders are very thin laminae which are cleaved off from a block. The resulting sheets are zero order retarders consisting just of a single piece of crystal.
Mica is a natural mineral and exhibits a noticeable absorption which becomes more pronounced at short wavelengths.
The thin mica sheets are cemented between two polished cover glasses made of N-BK7.
The plates can be ordered unmounted or with a cylindrical holder. An antireflection coating is available as an option.
We offer mica retarders either with half wave or quarter wave retardation. The plates are manufactured for a single design wavelength inside the spectral transmission range which has to be specified on the order.
Optical specifications
| material | mica |
| transmission range | 400-2000 nm |
| tolerance of the path difference | ± 10 nm |
| wavefront distortion | <λ/10 |
| marked direction | fast axis |
| prismatic deviation | <1' |
| temperature coefficient* a/R0(typ.) | 3∙10-4/K |
| angular coefficient* b/R0 (typ.) | 10-3/deg² |
Prices
| Diameter |
|
10 mm | 15 mm | 20 mm | 25 mm | 30mm | 40 mm | 50 mm |
| thickness with cover plates | [mm] | 4 | 5 | 6 | 8 | 8 | 10 | 14 |
| mount diameter | [mm] | 25 | 25 | 30 | 30 | 35 | 45 | 55 |
| mount length | [mm] | 10 | 10 | 15 | 15 | 15 | 15 | 20 |
| Art. No., retardance λ/2 | RZG 2.10 | RZG 2.15 | RZG 2.20 | RZG 2.25 | RZG 2.30 | RZG 2.40 | RZG 2.50 | |
| Art. No., retardance λ/4 | RZG 4.10 | RZG 4.15 | RZG 4.20 | RZG 4.25 | RZG 4.30 | RZG 4.40 | RZG 4.50 |
Prices
| order no. | 1 piece in € | 2-5 piece in € | 6-10 piece in € |
|---|---|---|---|
| RZG 2.10 | 220.- | 191.- | 164.- |
| RZG 2.15 | 263.- | 227.- | 194.- |
| RZG 2.20 | 336.- | 287.- | 242.- |
| RZG 2.25 | 376.- | 329.- | 286.- |
| RZG 2.30 | 432.- | 374.- | 335.- |
| RZG 2.40 | 528.- | 454.- | 413.- |
| RZG 2.50 | 687.- | 590.- | 537.- |
Prices
| order no. | 1 piece in € | 2-5 piece in € | 6-10 piece in € |
|---|---|---|---|
| RZG 4.10 | 220.- | 191.- | 164.- |
| RZG 4.15 | 263.- | 227.- | 194.- |
| RZG 4.20 | 336.- | 287.- | 242.- |
| RZG 4.25 | 376.- | 329.- | 286.- |
| RZG 4.30 | 432.- | 374.- | 335.- |
| RZG 4.40 | 528.- | 454.- | 413.- |
| RZG 4.50 | 687.- | 590.- | 537.- |
Price custom version
| option | order-no.: | additional price |
| holder for diameters up to 30 mm | RZG 0.30 | 75.- |
| holder for diameters up 40 mm | RZG 0.40 | 95.- |
| antireflection coating, R<0,8% in the range of 400-700 nm | RZG 1.02 | 80.- |
| larger diameter (up to 250 mm) | --- | on request |
| mica retardes without cover plates | --- | on request |
