FRESNEL RHOMB RETARDERS
Standard quarter and half wave Fresnel rhomb retarders are optimized for 272 nm ( Fused Quartz ), 380 nm ( FK5 ), 580 nm ( BK7 ) and 1080 nm ( BK7 ). The design of these is based on the principle that total internal reflection produces a phase delay between -p ( parallel to plane of incidence ) and -s ( perpendicular to plane of incidence ) vibration components. A quarter wave rhomb is a single parallelepiped and causes a beam displacement ( offset error ) which is approximately 1.3 times the aperture. Half wave rhombs are made of two quarter wave rhombs and are supplied cemented, optically contacted or air-spaced. Air-spaced rhombs are always mounted while others can be supplied unmounted as well. For various anti-reflection coating options, please refer to the Anti-Reflection Coating page on this web site.
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quarter wave Fresnel rhomb retarder |
half wave Fresnel rhomb retarder |
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retardation in waves vs wavelength in nanometers of four standard half wave rhomb retarders ( theoretical ) |
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Specifications:
surface flatness : at least quarter wave @ 633 nm over the clear aperture
surface quality : 40-20 scratch dig
reflectivity per surface : uncoated about 4%; BB coating 1.5% average; HEAR coated .7% average
please visit Anti Reflection Coatings page for reflectivity plots of available coatings
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ACHROMATIC QUARTER WAVE FRESNEL RHOMB RETARDERS |
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Catalog Number |
Clear Aperture Diameter (mm) |
Offset mm |
Substrate |
+/- 2% Retardation Error Range nm |
Mount Dimensions ( Inches) |
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Outside Diameter +/- .002 |
Length +/- .005 |
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| MFRS4-10-272 | 10 | 17.36 | Fused Qtz | 237-307 | 1.750 | 1.035 |
| MFRS4-10-380 | 10 | 17.51 | FK5 | 310-550 | 1.750 | 1.035 |
| MFRS4-10-580 | 10 | 18.34 | BK7 | 330-1000 | 1.750 | 1.160 |
| MFRS4-10-1080 | 10 | 17.85 | BK7 | 500-2000 | 1.750 | 1.080 |
| MFRS4-15-580 | 15 | 27.17 | BK7 | 330-1000 | 2.500 | 1.715 |
| MFRS4-20-380 | 20 | 34.06 | FK5 | 310-550 | 3.250 | 2.010 |
| MFRS4-20-580 | 20 | 35.66 | BK7 | 330-1000 | 3.250 | 2.000 |
| MFRS4-20-1080 | 20 | 34.71 | BK7 | 500-2000 | 3.250 | 2.100 |
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ACHROMATIC HALF WAVE FRESNEL RHOMB RETARDERS ( CEMENTED ) |
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Catalog Number |
Clear Aperture Diameter (mm) |
Substrate |
+/- 2% Retardation Error Range nm |
Mount Dimensions ( Inches) |
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Outside Diameter +/- .002 |
Length +/- .005 |
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| MFRC2-10-272 | 10 | Fused Qtz | 237-307 | 2.250 | 2.000 |
| MFRC2-10-380 | 10 | FK5 | 310-550 | 1.750 | 2.000 |
| MFRC2-10-580 | 10 | BK7 | 330-1000 | 2.250 | 2.250 |
| MFRC2-10-1080 | 10 | BK7 | 500-2000 | 2.250 | 2.125 |
| MFRC2-15-580 | 15 | BK7 | 330-1000 | 3.375 | 3.250 |
| MFRC2-20-380 | 20 | FK5 | 310-550 | 4.375 | 3.750 |
| MFRC2-20-580 | 20 | BK7 | 330-1000 | 4.375 | 4.250 |
| MFRC2-20-1080 | 20 | BK7 | 500-2000 | 4.375 | 4.000 |
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ACHROMATIC HALF WAVE FRESNEL RHOMB RETARDERS ( OPTICALLY CONTACTED ) |
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Catalog Number |
Clear Aperture Diameter (mm) |
Substrate |
+/- 2% Retardation Error Range nm |
Mount Dimensions ( Inches) |
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Outside Diameter +/- .002 |
Length +/- .005 |
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| MFRO2-10-272 | 10 | Fused Qtz | 237-307 | 2.250 | 2.000 |
| MFRO2-10-380 | 10 | FK5 | 310-550 | 1.750 | 2.000 |
| MFRO2-10-580 | 10 | BK7 | 330-1000 | 2.250 | 2.250 |
| MFRO2-10-1080 | 10 | BK7 | 500-2000 | 2.250 | 2.125 |
| MFRO2-15-580 | 15 | BK7 | 330-1000 | 3.375 | 3.250 |
| MFRO2-20-380 | 20 | FK5 | 310-550 | 4.375 | 3.750 |
| MFRO2-20-580 | 20 | BK7 | 330-1000 | 4.375 | 4.250 |
| MFRO2-20-1080 | 20 | BK7 | 500-2000 | 4.375 | 4.000 |
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ACHROMATIC HALF WAVE FRESNEL RHOMB RETARDERS ( AIR SPACED ) |
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Catalog Number |
Clear Aperture Diameter (mm) |
Substrate |
+/- 2% Retardation Error Range nm |
Mount Dimensions ( Inches) |
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Outside Diameter +/- .002 |
Length +/- .005 |
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| MFRA2-10-272 | 10 | Fused Qtz | 237-307 | 2.250 | 2.000 |
| MFRA2-10-380 | 10 | FK5 | 310-550 | 1.750 | 2.000 |
| MFRA2-10-580 | 10 | BK7 | 330-1000 | 2.250 | 2.250 |
| MFRA2-10-1080 | 10 | BK7 | 500-2000 | 2.250 | 2.125 |
| MFRA2-15-580 | 15 | BK7 | 330-1000 | 3.375 | 3.250 |
| MFRA2-20-380 | 20 | FK5 | 310-550 | 4.375 | 3.750 |
| MFRA2-20-580 | 20 | BK7 | 330-1000 | 4.375 | 4.250 |
| MFRA2-20-1080 | 20 | BK7 | 500-2000 | 4.375 | 4.000 |