Fuzhou Siaon Optoelectronic Technology Co., Ltd. provide Achromatic waveplate

Achromatic waveplate is similar to zero order waveplate except that the two plates are made from different birefringent crystals. Since the dispersion of the birefringence of two materials is different, it is possible to specify the retardation values at a broad wavelength range. So the retardation will be less sensitive to wavelength change. In other words, it can be used at a broadband wavelength range.  

Material: Quartz+MgF2

Dimension Tolerance:+0.0, -0.1mm

Clear Aperture: >90%

Wavefront Distortion: λ/4 632.8nm 

Surface Quality: 40-20 

Parallelism:< 10 arc sec

Retardation Tolerance: λ/100

Coating: AR Coating

Mount:Black Anodized Aluminum