Bi-Crystalline Achromatic Retarder
KEY FEATURES
- High Damage Threshold
- Volume Pricing
- Superior IR performance
DESCRIPTION
Meadowlark Optics is pleased to offer a selection of quarter- and half-wave achromatic retarders that span the UV, visible, near IR and IR portions of the spectrum. Two multi-order crystalline retarders, one made of crystalline quartz and the other magnesium fluoride, are combined in a subtractive mode to give an effective zero-order waveplate. By a careful choice of waveplate thicknesses, retardance dispersion is balanced to give a nearly constant retardance (in waves) over a broad range of wavelengths. The useable wavelength range is defined to give a retardance value within λ/100 of the nominal value. Custom designs with larger achromatic ranges or deeper UV wavelengths are available on request.
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Meadowlark Optics is pleased to offer a selection of quarter- and half-wave achromatic retarders that span the UV, visible, near IR and IR portions of the spectrum. Two multi-order crystalline retarders, one made of crystalline quartz and the other magnesium fluoride, are combined in a subtractive mode to give an effective zero-order waveplate. By a careful choice of waveplate thicknesses, retardance dispersion is balanced to give a nearly constant retardance (in waves) over a broad range of wavelengths. The useable wavelength range is defined to give a retardance value within λ/100 of the nominal value. Custom designs with larger achromatic ranges or deeper UV wavelengths are available on request.
Bi-Crystalline Achromats are similar in achromatic performance to our polymer achromats in the visible, but they excel in the IR. They have higher power handling capability than our polymer achromats and can with stand higher storage temperatures. Their field of view is narrow compared to polymer achromats. Typically, they cannot be expected to meet their retardance accuracy for rays whose incidence angles exceed 1.5°. If you must have the performance of a Bi-Crystalline Achromat and a large field of view, call us. We have a proprietary design that can be your polarization solution.
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| Specifications - Bi-Crystalline Achromatic Retarder | |
| Retarder Material | Quartz & Magnesium Fluoride |
| Retardance Accuracy | λ/4 or λ/2 |
| Temp. Coefficient of Retardance | λ/500 per ˚C |
| Standard Wavelengths - Quarter Wave | |
|
Ultraviolet Visible Near Infrared Infrared |
395-465 nm 475-590 nm 600-900 nm 690-2050 nm |
| Standard Wavelengths - Half Wave | |
|
Ultraviolet Visible Near Infrared Infrared |
412-475 nm 500-650 nm 600-840 nm 1190-1660 nm |
| Transmitted Wavefront Distortion | ≤ λ/4 |
| Surface Quality (scratch-dig) | 40-20 |
| Beam Deviation | ≤ 1 arc-min |
| Reflectance (per surface) | ≤ 0.5% at normal incidence |
| Storage Temperature | -40˚C to +75˚C |
| Threshold | 2 J/cm2, 10 ns, 1064 nm |
| Ordering Information - Bi-Crystalline Achromatic Retarders | ||
| Mounted | ||
|
Clear Aperture in. [mm] |
Diameter in. [mm] |
Part Number |
| Half Wave | ||
|
0.40 [10.2] |
Ø1.00 [Ø25.4] |
CHM-050 |
| Quarter Wave | ||
|
0.40 [10.2] |
Ø1.00 [Ø25.4] |
CQM-050 |
| Unmounted | ||
|
Clear Aperture in. [mm] |
Diameter in. [mm] |
Part Number |
| Half Wave | ||
|
0.40 [10.2] |
Ø0.50 [Ø12.7] |
CH-050 |
| Quarter Wave | ||
|
0.40 [10.2] |
Ø0.50 [Ø12.7] |
CQ-050 |
|
We offer standard Bi-Crystalline Achromatic Retarders to cover 4 regions of the spectrum: UV, VIS, NIR, IR Please specify wavelength region when placing order. |
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