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.
Read More...Specifications - Bi-Crystalline Achromatic Retarder | |
Retarder Material | Quartz & Magnesium Fluoride |
Retardance | 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. |