Precision Achromatic Retarder

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Precision Achromatic Retarder

Meadowlark Optics Precision Achromatic Retarders are designed to provide a nearly constant retardance over a broad wavelength region. Standard quarter- and half-wave devices are available for common wavelength regions in the visible and near infrared.

  • Broad spectral range
  • Superior field of view

Specifications - Precision Achromatic Retarder
Retarder Material Birefringent Polymer
Substrate Material N-BK7
Standard Wavelengths
545
630
720
840
1060
1400
(485-630 operating range)
(555-730 operating range)
(630-835 operating range)
(735-985 operating range)
(920-1240 operating range)
(1200-1650 operating range)
Custom Wavelengths 400-1800 nm (specify)
Retardance λ/4 and λ/2
Retardance Accuracy ≤ λ/100
Transmitted Wavefront Distortion ≤ λ/4
Surface Quality (scratch-dig) 40-20
Beam Deviation ≤ 1 arc-min
Reflectance (per surface) ≤ 0.5% at normal incidence
Threshold 500 W/cm2, CW
600 mJ/cm2, 20 ns, visible
4 J/cm2, 20 ns, 1064 nm
Operating Temperature -20˚C to +50˚C
 

 

Ordering Information - Precision Achromatic Retarders
Mounted
Clear
Aperture
in. [mm]
Dimensions
± 0.005 in.
[± 0.13 mm]
Thickness
± 0.020 in.

[±0.51 mm]
Part Number
Quarter Wave
0.40
[10.2]
Ø1.00
[Ø25.4]
0.25
[6.35]
AQM-050-λ
0.70
[17.8]
Ø1.00
[Ø25.4]
0.35
[8.9]
AQM-100-λ
1.20
[30.5]
Ø2.00
[Ø50.8]
0.50
[12.7]
AQM-200-λ
Half Wave
0.40
[10.2]
Ø1.00
[Ø25.4]
0.25
[6.4]
AHM-050-λ
0.70
[17.8]
Ø1.00
[Ø25.4]
0.35
[8.9]
AHM-100-λ
1.20
[30.5]
Ø2.00
[Ø50.8]
0.50
[12.7]
AHM-200-λ
Unmounted
Clear
Aperture
in. [mm]
Dimensions
+ 0/-0.010
[+0/-0.25mm]
Thickness
± 0.020 in.

[±0.51 mm]
Part Number
Quarter Wave
0.40
[10.2]
Ø0.50
[Ø12.7]
0.14
[3.6]
AQ-050-λ
0.80
[20.3]
Ø1.00
[Ø25.4]
0.28
[7.1]
AQ-100-λ
1.60
[40.6]
Ø2.00
[Ø50.5]
0.50
[12.7]
AQ-200-λ
Half Wave
0.40
[10.2]
Ø0.50
[Ø12.7]
0.14
[3.6]
AH-050-λ
0.80
[20.3]
Ø1.00
[Ø25.4]
0.28
[7.1]
AH-100-λ
1.60
[40.6]
Ø2.00
[Ø50.5]
0.50
[12.7]
AH-200-λ
Please specify your center wavelength λ in nanometers when ordering. Custom size retarders with improved transmitted wavefront distortion and/or beam deviation are available. Your requirements for custom shapes and sizes are also welcome. Please call for a quote.  Meadowlark Optics one and two-inch diameter retarders conveniently fit our Rotary Mounts.