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Waveplates

 

Waveplates (retardation plates or phase shifters) are made from materials which exhibit birefringence. The velocities of the extraordinary and ordinary rays through the birefringent material vary inversely with their refractive indices. This difference in velocities gives rise to a phase difference when the two beams recombine. In the case of an incident linearly polarized beam this is given by α=2πd(ne-no)/λ, where is α phase difference; d is thickness of waveplate; ne, no are refractive indices of extraordinary and ordinary rays respectively; λ is wavelength. At any specific wavelength the phase difference is governed by the thickness of the retarder.

Casix waveplates, including octadic-wave (λ/8), quarter-wave (λ/4), half-wave (λ/2) and full-wave (λ) plates, are widely used in synthesis and analysis of light in various states of polarization. The wavelengths within the range of 240nm~2100nm are all available at CASIX.


Waveplates.jpg


Low Order Waveplates

    •     Thickness: 0.2-0.5mm

    •     High Damage Threshold

    •     Better Temperature Bandwidth

    •     Low Cost

waveplate

Capability:

AttributeCommercialHigh Precision
MaterialCrystal Quartz, MgF2Crystal Quartz, MgF2
Dimension Tolerance+0, -0.13mm±0.02mm
Wavefront Distortionλ/8@632.8nmλ/20@632.8nm
Retardation Toleranceλ/120λ/500
Wavelength Range240~2100nm240~2100nm
Parallelism3 arc seconds0.5 arc seconds
Surface Quality20-10 scratch and dig10-5 scratch and dig
AR/AR CoatingR<0.2% at central wavelengthR<0.1% at central wavelength


Theoretical Retardance Curve

waveplate2

Air-spaced Zero Order Waveplates

    •     Double Retardation Plates

    •     Wide Temperature Bandwidth

    •     Broad Spectral Bandwidth

    •     High Damage Threshold

    •     AR Coated and Mounted

waveplate

Capability:

AttributeCommercialHigh Precision
MaterialCrystal QuartzCrystal Quartz
Dimension Tolerance+0, -0.2mm±0.05mm
Wavefront Distortionλ/4@632.8nmλ/10@632.8nm
Retardation Toleranceλ/120λ/300
Wavelength Range240~2100nm240~2100nm
Parallelism (Single Quartz Plate)3 arc seconds0.5 arc seconds
Surface Quality20-10 scratch and dig10-5 scratch and dig
AR/AR CoatingR<0.2% at central wavelengthR<0.1% at central wavelength


True Zero-Order Waveplates

Capability:

AttributeCommercialHigh Precision
MaterialCrystal Quartz,N-BK7Crystal Quartz,N-BK7
Dimension Tolerance+0, -0.13mm±0.02mm
Wavefront Distortionλ/8@632.8nmλ/20@632.8nm
Retardation Toleranceλ/240λ/500
Wavelength Range400~2100nm240~2100nm
Parallelism 3 arc seconds1 arc seconds
Surface Quality20-10 scratch and dig10-5 scratch and dig
AR/AR CoatingR<0.2% at central wavelengthR<0.1% at central wavelength


Cemented True Zero-Order Waveplates

    •     Broad Spectral Bandwidth

    •     Wide Temperature Bandwidth

    •     Wide Angle Bandwidth

    •     Cemented by Epoxy

waveplate

Single Plate True Zero-Order Waveplates

    •     Broad Spectral Bandwidth

    •     Wide Temperature Bandwidth

    •     Wide Angle Bandwidth

    •     High Damage Threshold

    •     Standard Wavelength: 1310nm, 1550nm

    •     λ/2 Waveplate

    •     Thickness Down to 0.028mm

waveplate

Zero-Order Waveplates

Cemented & Optically Contacted Zero-Order Waveplates

    •     Double Plates

    •     Broad Spectral Bandwidth

    •     Wide Temperature Bandwidth

    •     AR Coated

waveplate

Capability:

AttributeCommercialHigh Precision
MaterialCrystal QuartzCrystal Quartz
Dimension Tolerance+0, -0.2mm±0.05mm
Wavefront Distortionλ/4@632.8nmλ/10@632.8nm
Retardation Toleranceλ/120λ/300
Wavelength Range400~2100nm240~2100nm
Parallelism (Single Plate)3 arc seconds0.5 arc seconds
Surface Quality20-10 scratch and dig10-5 scratch and dig
AR/AR CoatingR<0.2% at central wavelengthR<0.1% at central wavelength


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