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


Achromatic Retarders

Achromatic Retarders

Achromatic retarders can be regarded as zero order double plates where the two plates are manufactured from different materials (quartz and MgF22 ). By exploiting the difference of dispersion of the birefringence one achieves an almost constant phase shift over a broader spectral range.

The retarders are available either cemented between cover plates or in a cementless version with air gap. The cemented version is the more economical one and exhibits slightly lower reflection losses. The version with air gap excels in a high damage threshold and low material dispersion.

The retarders are delivered in a cylindrical mount.

We manufacture achromatic retarders for six standard spectral ranges specified below. The diagrams of the path difference versus wavelength shows the values for the half wave plates. For quarter wave plates the retardation has half the value at any wavelength.

The retarders covering short wavelength ranges require one or both of the crystal plates to be manufactured as double plate leading to a total number of three or four plates, respectively. For the cemented version a significant reflection loss only occurs at the two outer surfaces. For the version with air gap reflection losses have to be considered on both surfaces of each plate, namely 4-8 surfaces.

Achromatic retarders with air gap are particularly suited for ultra-short pulsed lasers. For this reason their group delay dispersion (GDD) is specified for a representative wavelength in the table. The dispersion for the cemented version is significantly larger due to the cover plates .

material quartz and MgF2
wavefront distortion <λ/10
prismatic deviation <2'' (air gap), <1' (gekittet)
marked direction fast axis
Fertigungstoleranz ±3 nm

* Definition

spectral range 1 180-300 nm
deviation of retardation ± 8,5%
number of plates 4
reflectivity quartz: <2% MgF2: <3%
temperature coefficient* α(typ.) λ/2: 2∙10-3nm/K  λ/4:1∙10-3 nm/K
angular coefficient* ß (typ.) 2,5 nm/deg²
GDD (λ=266 nm) 500 fs²
Bereich 1

version with air gap

format 10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/2 RAC 1.2.10 L RAC 1.2.15 L RAC 1.2.20 L RAC 1.2.25 L
Art. No.:, λ/4 RAC 1.4.10 L RAC 1.4.15 L RAC 1.4.20 L RAC 1.4.25 L
1 pieces in € 881,- 1482,- 2421,- 3665,-
2-5 pieces in € 818,- 1361,- 2206,- 3303,-
6-10 pieces in € 746,- 1222,- 1960,- 2890,-
spectral range 2 300-470 nm
deviation of retardation ± 5%
number of plates λ/2: 3   λ/4: 4
reflectivity <0,5%
temperature coefficient* α(typ.) λ/2: 0,05 nm/K  λ/4:0,025 nm/K
angular coefficient* ß (typ.) λ/2: 1,5 nm/deg²  λ/4:2,4 nm/deg²
GDD (λ=266 nm) λ/2: 94 fs²  λ/4: 250 fs²
Bereich 2

λ/2 version cemented with cover plates

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 15 15
Art. No.:, λ/2
RAC 2.2.10 RAC 2.2.15 RAC 2.2.20 RAC 2.2.25
1 pieces in € 766,- 1247,- 2030,- 3180,-
2-5 pieces in € 711,- 1145,- 1850,- 2866,-
6-10 pieces in € 649,- 1028,- 1643,- 2507,-

λ/4 version cemented with cover plates

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 15 15
Art. No.:, λ/4
RAC 2.4.10 RAC 2.4.15 RAC 2.4.20 RAC 2.4.25
1 pieces in € 894,- 1480,- 2439,- 3793,-
2-5 pieces in € 831,- 1359,- 2222,- 3418,-
6-10 pieces in € 758,- 1220,- 1975,- 2990,-

λ/2 version with air gap

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/2
RAC 2.2.10 L RAC 2.2.15 L RAC 2.2.20 L RAC 2.2.25 L
1 pieces in € 855,- 443,- 2352,- 3461,-
2-5 pieces in € 794,- 1325,- 2143,- 3119,-
6-10 pieces in € 724,- 1190,- 1904,- 2728,-

λ/4 version with air gap

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/4
RAC 2.4.10 L RAC 2.4.15 L RAC 2.4.20 L RAC 2.4.25 L
1 pieces in € 983,- 1676,- 2761,- 4073,-
2-5 pieces in € 913,- 1539,- 2516,- 3671,-
6-10 pieces in € 833,- 1382,- 2235,- 3211,-
spectral range 3 460-680 nm
deviation of retardation ± 3%
number of plates 2
reflectivity <0,5%
temperature coefficient* α(typ.) λ/2: 0,2 nm/K  λ/4:0,1 nm/K
angular coefficient* ß (typ.) λ/2: 0,8 nm/deg²  λ/4:0,4 nm/deg²
GDD (λ=266 nm) λ/2: 62 fs²  λ/4: 31 fs²
Bereich 3

version cemented with cover plates

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 15 15
Art. No.:, λ/2
RAC 3.2.10 RAC 3.2.15 RAC 3.2.20 RAC 3.2.25
Art. No.:, λ/4
RAC 3.4.10 RAC 3.4.15 RAC 3.4.20 RAC 3.4.25
1 pieces in € 577,- 918,- 1487,- 2274,-
2-5 pieces in € 536,- 843,- 1355,- 2049,-
6-10 pieces in € 489,- 757,- 1204,- 1793,-

version with air gap

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/2
RAC 3.2.10 L RAC 3.2.15 L RAC 3.2.20 L RAC 3.2.25 L
Art. No.:, λ/4
RAC 3.4.10 L RAC 3.4.15 L RAC 3.4.20 L RAC 3.4.25 L
1 pieces in € 687,- 1135,- 1812,- 2578,-
2-5 pieces in € 638,- 1042,- 1651,- 2323,-
6-10 pieces in € 582,- 936,- 1467,- 2032,-
spectral range 4 500-900 nm
deviation of retardation ± 6 %
number of plates 2
reflectivity <0,5%
temperature coefficient* α(typ.) λ/2: 0,3 nm/K  λ/4: 0,15nm/K
angular coefficient* ß (typ.) λ/2: 1,1 nm/deg²  λ/4:0,6 nm/deg²
GDD (λ=266 nm) λ/2: 50 fs²  λ/4: 25 fs²
Bereich 4

version cemented with cover plates

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 15 15
Art. No.:, λ/2
RAC 4.2.10 RAC 4.2.15 RAC 4.2.20 RAC 4.2.25
Art. No.:, λ/4
RAC 4.4.10 RAC 4.4.15 RAC 4.4.20 RAC 4.4.25
1 pieces in € 577,- 918,- 1487,- 2274,-
2-5 pieces in € 536,- 843,- 1355,- 2049,-
6-10 pieces in € 489,- 757,- 1204,- 1793,-

version with air gap

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/2
RAC 4.2.10 L RAC 4.2.15 L RAC 4.2.20 L RAC 4.2.25 L
Art. No.:, λ/4
RAC 4.4.10 L RAC 4.4.15 L RAC 4.4.20 L RAC 4.4.25 L
1 pieces in € 687,- 1135,- 1812,- 2578,-
2-5 pieces in € 638,- 1042,- 1651,- 2323,-
6-10 pieces in € 582,- 936,- 1467,- 2032,-
spectral range 5 600-1200 nm
deviation of retardation ± 5%
number of plates 2
reflectivity <0,8%
temperature coefficient* α(typ.) λ/2: 0,5 nm/K  λ/4: 0,25nm/K
angular coefficient* ß (typ.) λ/2: 1,6 nm/deg²  λ/4:0,8 nm/deg²
GDD (λ=266 nm) λ/2: 75 fs²  λ/4: 37 fs²
Bereich 5

version cemented with cover plates

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 15 15
Art. No.:, λ/2
RAC 5.2.10 RAC 5.2.15 RAC 5.2.20 RAC 5.2.25
Art. No.:, λ/4
RAC 5.4.10 RAC 5.4.15 RAC 5.5.20 RAC 5.5.25
1 pieces in € 577,- 918,- 1487,- 2274,-
2-5 pieces in € 536,- 843,- 1355,- 2049,-
6-10 pieces in € 489,- 757,- 1204,- 1793,-

version with air gap

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/2
RAC 5.2.10 L RAC 5.2.15 L RAC 5.2.20 L RAC 5.2.25 L
Art. No.:, λ/4
RAC 5.4.10 L RAC 5.4.15 L RAC 5.4.20 L RAC 5.4.25 L
1 pieces in € 687,- 1135,- 1812,- 2578,-
2-5 pieces in € 638,- 1042,- 1651,- 2323,-
6-10 pieces in € 582,- 936,- 1467,- 2032,-
spectral range 6 700-2500 nm
deviation of retardation ± 4%
number of plates 2
reflectivity <2%
temperature coefficient* α(typ.) λ/2: 0,6 nm/K  λ/4: 0,3nm/K
angular coefficient* ß (typ.) λ/2: 1,9 nm/deg²  λ/4:0,9 nm/deg²
GDD (λ=266 nm) λ/2: -59 fs²  λ/4: -29 fs²
Bereich 6

version cemented with cover plates

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 15 15
Art. No.:, λ/2
RAC 6.2.10 RAC 6.2.15 RAC 6.2.20 RAC 6.2.25
Art. No.:, λ/4
RAC 6.4.10 RAC 6.4.15 RAC 6.4.20 RAC 6.4.25
1 pieces in € 577,- 918,- 1487,- 2274,-
2-5 pieces in € 536,- 843,- 1355,- 2049,-
6-10 pieces in € 489,- 757,- 1204,- 1793,-

version with air gap

format
10 mm 15 mm 20 mm 25 mm
free aperture [mm] 9,5 14,5 19,5 24,5
mount diameter [mm] 25 25 30 40
mount length [mm] 10 10 10 15
Art. No.:, λ/2
RAC 6.2.10 L RAC 6.2.15 L RAC 6.2.20 L RAC 6.2.25 L
Art. No.:, λ/4
RAC 6.4.10 L RAC 6.4.15 L RAC 6.4.20 L RAC 6.4.25 L
1 pieces in € 687,- 1135,- 1812,- 2578,-
2-5 pieces in € 638,- 1042,- 1651,- 2323,-
6-10 pieces in € 582,- 936,- 1467,- 2032,-
Anthee Größen (bis 100 mm) auf Anfrage


Anthee spectral rangee auf Anfrage


Adapter for mount diameter 30 mm und 40 mm Seite 59


Unmounte Platten auf Anfrage