Our polymer achromatic half waveplates consist of a polymer film stack laminated between two high-precision AR coated N-BK7 windows and are designed to operate with a high degree of retardation accuracy over a broad wavelength range. Achromatic polymer waveplates have better angular acceptance and less sensitivity to wavelength change than achromatic quartz-MgF2 waveplates.
Retardation accuracy of ±λ/100 over entire wavelength range
Less sensitive to wavelength than achromatic quartz-MgF2 waveplates
Better angular acceptance than achromatic quartz-MgF2 waveplates
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achromatic-zero-order-waveplates - Drawings
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Specifications
Retardation
λ/2
Retardation Accuracy
±λ/100
Material
Grade A N-BK7
Diameter
25.4 mm
Housing
Black Anodized Aluminum
Clear Aperture
10.2 mm
Antireflection Coating
Broadband, multilayer coating
Average Reflectance
<0.5%
Damage Threshold
500 W/cm2 CW
Pulse Damage Threshold
0.3 J/cm2 with 10 nsec pulses, visible 0.5 J/cm2 with 10 nsec pulses at 1064 nm
Surface Quality
40-20 scratch-dig
Acceptance Angle
± 7°
Transmitted Beam Deviation
≤1 arc min
Wavefront Distortion
≤λ/4 at 632.8 nm over the full aperture
Diameter Tolerance
±0.13 mm
Thickness
6.0 mm
Operating Temperature Range
-20 to 50°C
Features
High Retardation Accuracy
Our polymer achromatic waveplates are designed to operate with a high degree of retardation accuracy over a broad wavelength range. These true zero-order wave plates are constructed using a stack of birefringent polymer films laminated between two high-precision N-BK7 optical windows, each with a high efficiency, broadband antireflection coating. This construction ensures excellent transmitted wavefront quality, while minimizing beam deviation and surface reflection losses.
Low Sensitivity to Wavelength Change
Achromatic Zero-Order Waveplates have low sensitivity to incidence angle and wavelength. Retardation changes by less than 1% over a ±7° incidence angle and is maintained to better than ±λ/100 over the entire bandwidth. This is a significant improvement in angular acceptance and less sensitivity to wavelength change than achromatic quartz–MgF2 wave plates. One drawback however is that the achromatic waveplates have some variation in transmittance vs wavelength due to several polymer layers that are used in each achromatic wave plate. Quartz-MgF2 offer a higher and more uniform transmittance.
Black Anodized Aluminum Housing
The achromatic waveplate assembly is mounted in a black anodized aluminum housing for protection and ease of mounting, with the retarder fast axis marked for alignment reference. The standard 25.4 mm outer diameter housing has a 10.2 mm diameter clear aperture and is convenient for mounting into Newport rotation mounts.
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