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Low Order Retarders

Low Order Retarders

The retarders are made from a single plate. The path difference between the principal polarization axes is equal to the specified fraction of the design wavelength in addition to in integer multiple of it. The integer part is chosen in order to achieve a mechanical of thickness 0,15-0,25 mm.

The retarders are delivered in a cylindrical holder.

We manufacture low order retarders from crystalline quartz and from MgF2 Quartz is by far the most frequently used material. The quartz retarders are antireflection coated on both sides by default.

Low order plates made of MgF 2 are mainly chosen for wavelength in the mid infrared where quartz is not transparent. In contrast to quartz MgF2 does not show optical activity. This makes it suited for some applications with very high demands on the purity of the polarization. Retarders made of MgF2 are delivered without antireflection coating.

We offer low order retarders with a path difference of λ/2 or λ/4 for a large variety of standard wavelengths. Retarders designed for non-standard wavelengths are available at reasonable prices according to the price list.

Optical specifications

material quartz MgF2
spectral range 180-2700 nm 125-7000 nm
tolerance of the path difference ±3 nm ±3 nm
wavefront distortion < λ/10 < λ/10
marked direction fast axis fast axis
reflectivity <0,1% ca. 2,5%
temperature coefficient* a (typ.) -0,1 nm/K -0,1 nm/K
angular coefficient* b (typ.) 0,1 nm/deg² 0,2 nm/deg²

Standard dimensions

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. version aus quartzλ/2
RLQ 2.10 RLQ 2.15 RLQ 2.20 RLQ 2.25
Art. No. quartzλ/4
RLQ 4.10 RLQ 4.15 RLQ 4.20 RLQ 4.25
Art. No. version aus MgF 2 λ/2
RLM 2.10 RLM 2.15 RLM 2.20 RLM 2.25
Art. No. version aus MgF 2 λ/4
RLM 4.10 RLM 4.15 RLM 4.20 RLM 4.25

* Definition

standard wavelengths

The prices are valid for the following standard wavelengths.

355 nm 375 nm 390 nm 395 nm 400 nm 405 nm 425 nm 440 nm 488 nm
514 nm 532 nm 589 nm 633 nm 650 nm 670 nm 685 nm 780 nm 785 nm
790 nm 795 nm 800 nm 810 nm 830 nm 852 nm 946 nm 1030 nm 1047 nm
1053 nm 1064 nm 1083 nm 1300 nm 1320 nm 1540 nm 1550 nm 2023 nm

λ/2 prices quartz standardwavelengths

order no. 1 piece in € 2-5 piece in € 6-10 piece in €
RLQ 2.10 271.- 254.- 230.-
RLQ 2.15 479.- 446.- 401.-
RLQ 2.20 779.- 729.- 671.-
RLQ 2.25 1234.- 1018.- 875.-

λ/4 prices quartz standardwavelengths

order no. 1 piece in € 2-5 piece in € 6-10 piece in €
RLQ 4.10 271.- 254.- 230.-
RLQ 4.15 479.- 446.- 401.-
RLQ 4.20 779.- 729.- 671.-
RLQ 4.25 1234.- 1018.- 875.-

non- standard wavelengths

λ/2 prices quartz non-standard wavelengths

order no. 1 piece in € 2 piece in € 3-5 piece in € 6-10 piece in €
RLQ 2.10 460.- 416.- 350.- 295.-
RLQ 2.15 813.- 750.- 563.- 491.-
RLQ 2.20 1181.- 1062.- 839.- 741.-
RLQ 2.25 1790.- 1478.- 1166.- 988.-

λ/4 prices quartz non-standard wavelengths

order no. 1 piece in € 2 piece in € 3-5 piece in € 6-10 piece in €
RLQ 4.10 460.- 416.- 350.- 295.-
RLQ 4.15 813.- 750.- 563.- 491.-
RLQ 4.20 1181.- 1062.- 839.- 741.-
RLQ 4.25 1790.- 1478.- 1166.- 988.-

standard wavelengths

The prices are valid for the following standard wavelengths.

532 nm 633 nm 10 64nm 3500 nm 4750 nm 6000 nm

λ/2 prices MgF2 standardwavelengths

order no. 1 piece in € 2-5 piece in € 6-10 piece in €
RLM 2.10 404.- 347.- 294.-
RLM 2.15 586.- 528.- 451.-
RLM 2.20 891.- 797.- 690.-
RLM 2.25 1621.- 1325.- 1128.-

λ/2 prices MgF2 standardwavelengths

order no. 1 piece in € 2-5 piece in € 6-10 piece in €
RLM 4.10 404.- 347.- 294.-
RLM 4.15 586.- 528.- 451.-
RLM 4.20 891.- 797.- 690.-
RLM 4.25 1621.- 1325.- 1128.-

λ/2 prices MgF2 non-standard wavelengths

order no. 1 piece in € 2 piece in € 3-5 piece in € 6-10 piece in €
RLM 2.10 606.- 510.- 399.- 337.-
RLM 2.15 878.- 740.- 602.- 523.-
RLM 2.20 1219.- 1037.- 855.- 751.-
RLM 2.25 2115.- 1720.- 1325.- 1128.-

λ/2 prices MgF2 non-standard wavelengths

order no. 1 piece in € 2 piece in € 3-5 piece in € 6-10 piece in €
RLM 4.10 606.- 510.- 399.- 337.-
RLM 4.15 878.- 740.- 602.- 523.-
RLM 4.20 1219.- 1037.- 855.- 751.-
RLM 4.25 2115.- 1720.- 1325.- 1128.-

Price custom version

adaptor for mount diameters 30mm and 40 mm adaptor ring mount
connection with Thorlabs SM1 or SM2 thread on request
other sizes (up to 100 mm) on request
Aother path differences(e.g. l/8-Platten) on request
retarders for 2 wavelengths on request
unmounted plates auf Anfrage
antireflection coating for MgF2-Platten on request
higher accuracy of path difference on request