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    Achromatic Zero-Order Waveplates

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    Achromatic Zero-Order Waveplates

    Achromatic Zero-Order waveplate is made from two different substrate Material such as crystal quartz and magnesium fluoride. For the single material waveplates the working wavelength is very limited because of the dispersion of the material. While Achromatic Zero-Order Waveplate use two different kinds of material, the dispersions of the birefringence are also different. Hence such waveplate is not sensitive to the wavelength change.
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       CASTECH design Achromatic Zero-Order Quartz-MgF2 waveplates with working wavelength range larger than 300nm and retardation accuracy better than λ/50 for λ/2 waveplate and better than λ/100 for λ/4 waveplate.

    Main advantages:

             ?   Extremely broad wavelength ranges

             ?   High damage threshold for Air-spaced Achromatic Zero-Order waveplate

             ?   Low sensitivity within the designed wavelength

             ?   Retardation tolerance up to λ /100 over the wavelength range

     

    CASTECH can offer two kinds of Achromatic Zero-Order Waveplates:Air Spaced and Optically Contacted Achromatic Zero-Order Waveplates.

     

     

     

    Specifications:

    Material Crystal Quartz and Magnesium Fluoride
    Diameter Tolerance +0/-0.2mm
    Retardance Accuracy

    better than λ/50 for λ/2 achromatic waveplates

    better than λ/100 for λ/4 achromatic waveplates

    Clear Aperture    ≥ central 90%  of  diameter
    Surface Quality 40/20
    Wavefront  Distortion λ/4 @ 632.8nmover the clear aperture      
    Parallelism ≤10″
    Coating AR coating at design wavelength
    Damage Threshold 500W/cm2,4J/cm2,20ns

     

     

     

     

    Order Information:

     

     

    WPAO ---- 127 ---- 1/4 ---- W400-700
         
    Product Code   Φ=12.7mm   Retardation=λ/4   Design Wavelength "λ"=400-700nm

     

    Achromatic Zero-Order  Waveplates:

    Optically Contacted Achromatic Zero-Order Waveplate Air-Spaced Achromatic Zero-Order Waveplate
    Half Achromatic Waveplate Quarter Achromatic Waveplate Half Achromatic Waveplate Quarter Achromatic Waveplate
       WPAO-127-1/2-λ       WPAO-127-1/4-λ       WPAA-127-1/2-λ       WPAA-127-1/4-λ   
    WPAO-150-1/2-λ WPAO-150-1/4-λ WPAA-150-1/2-λ WPAA-150-1/4-λ
    WPAO-200-1/2-λ WPAO-200-1/4-λ WPAA-200-1/2-λ WPAA-200-1/4-λ
    WPAO-254-1/2-λ WPAO-254-1/4-λ WPAA-254-1/2-λ WPAA-254-1/4-λ

     

    Standard Wavelength Ranges(λ):

       400-700nm       700-1000nm       1200-1650nm   

     

    Note:

       ?  Custom designs for other sizes and coatings are also available upon request.

       ?  CASTECH’s standard coatings are available.

       ?  Other waveplates with different wavelength range (between 400-2100nm) are also available upon request, please contact CAETECH for more information. 

        

     

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