Wide Field Retarder

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Wide Field Retarder

Meadowlark Optics now offers Wide Field Retarders, the latest innovation in near zero-order polymer retarder technology. At their design wavelength, Wide Field Retarders provide a consistent retardance value over a wide acceptance angle, out to 30° or more.

Standard quarter- and half-wave designs are available for common wavelengths in the visible to near infrared region. The graphs show the Wide Field Retarder performance as a function of incidence angle for the both half-wave and quarter-wave designs. 

Multilayer broadband antireflection (BBAR) coatings are included as standard. Note that BBAR coating performance varies with incidence angle; these coatings perform best at (or near) normal incidence.

As with all Meadowlark Optics retarders, the fast axis is conveniently marked. Custom retardance values are available for wavelengths from 400-1800 nm. Please call for application assistance or to request a custom quotation.

  • Unmatched off-axis performance
  • Standard and custom wavelength retarders
  • Mounted and unmounted versions available
  • Off-axis performance ideal for uncollimated light applications

Specifications - Wide Field Retarder
Retarder Material Birefringent Polymer
Substrate Material N-BK7
Standard Wavelengths 532, 632.8, 670, 780, 850, 1064, and 1550 nm
Custom Wavelengths 400-1800nm (specify)
Retardance λ/2 and λ/4
Retardance Accuracy ≤ λ/250 at normal incidence at the center of the part
Retardance Change (at 30˚tilt)
Half-wave
Quarter-wave
≤ λ/100
≤ λ/200
Transmitted Wavefront Distortion ≤ λ/2
Surface Quality (scratch-dig) 60-40
Beam Deviation ≤ 1 arc-min
Reflectance (per surface)
At normal incidence
At 30˚ incidence
≤ 0.5%
≤ 1.0%
Operating Temperature 0˚C to 40˚C
 

 

 

 

 

 

Ordering Information - Wide Field Retarders
Mounted
Clear
Aperture>
in. [mm]
Dimensions
± 0.005 in.
[± 0.13 mm]
Thickness
in. [mm]
Part Number
 
Quarter Wave
0.40
[10.2]
Ø1.00
[Ø25.4]
0.25
[6.35]
WQM-050-λ
0.70
[17.8]
Ø1.00
[Ø25.4]
0.35
[8.9]
WQM-100-λ
Half Wave
0.40
[10.2]
Ø1.00
[Ø25.4]
0.25
[6.35]
WHM-050-λ
0.70
[17.8]
Ø1.00
[Ø25.4]
0.35
[8.9]
WHM-100-λ
Unmounted
Clear
Aperture
in. [mm]
Dimensions
+ 0/-0.010
[+0/-0.25mm]
Thickness
in. [mm]
Part Number
Quarter Wave
0.40
[10.2]
Ø0.50
[Ø12.7]
0.14
[3.6]
WFQ-050-λ
0.80
[20.3]
Ø1.00
[Ø25.4]
0.28
[7.1]
WFQ-100-λ
Half Wave
0.40
[10.2]
Ø0.50
[Ø12.7]
0.14
[3.6]
WFH-050-λ
0.80
[20.3]
Ø1.00
[Ø25.4]
0.28
[7.1]
WFH-100-λ
Custom sizes and retardance values are available.

Please contact your Meadowlark Optics sales engineer for a custom quote.