Waveplates
 

Principle of 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 materials vary inversely with their refractive indices. The 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 a=2pi*d(ne-no)/l (a-phase difference; d-thickness of waveplate; ne,no-refractive indices of extraordinary and ordinary rays respectively; l-wavelength). At any specific wavelength the phase difference is governed by the thickness of the retarder.

Transmission range:330nm-2100nm
Thermal Expansion Coefficient:7.5x10-6/K
Density:2.51g/cm3

 

 


Half Waveplate

 

The thickness of a half waveplate is such that the phase difference is 1/2lambda-wavelength (true-zero order) or some multiple of 1/2lambda-wavelength (multiple order).

A linearly polarized beam incident on a half waveplate emerges as a linearly polarized beam but rotates such that its angle to the optical axis is twice that of the incident beam. Therefore, half waveplates can be used as continuously adjustable polarization rotators. Half waveplates are used in rotating the plane of polarization, electro-optic modulation and as a variable ratio beamsplitter when used in conjunction with a polarization cube.

 

 

 

Quarter Waveplate

 

The thickness of the quarter waveplate is such that the phase difference is 1/4 lambda wavelength (true-zero order) or some multiple of 1/4 lambda wavelength (multiple order).

If the angle q (between the electric field vector of the incident linearly polarized beam and the retarder principal plane) of the quarter waveplate is 45, the emergent beam is circularly polarized. When a quarter waveplate is double passed, i.e. by mirror reflection, it acts as a half waveplate and rotates the plane of polarization to a certain angle. Quarter waveplates are used in creating circular polarization from linear or linear polarization from circular, ellipsometry, optical pumping, suppressing unwanted reflection and optical isolation.

 

Order Information: Part No.+Retardance+Wavlength 

Eg. WPL11+1/2lambda+1064nm

 

 

 

1. Cemented Achromatic waveplate

Achromatic waveplate is similar to Zero-order waveplate except that the two plates are made from different materials, such as crystal quartz and magnesium fluoride. Since the dispersion of the birefringence can be different for the two materials, it is possible to specify the retardation values at a wavelength range.
 
Material: Optical grade Crystal Quartz and MgF2
Dimension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/100 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: VIS :465-610nm, NIR:700-1000nm, IR:1200-1650nm

 

 

2. Low-order waveplate

 

Thickness: 0.2-0.5 mm
High Damage Threshold
Low Cost

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/300 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength:
266nm, 355nm, 532nm, 632.8nm, 800nm, 850nm, 980nm, 1064nm, 1310nm, 1550nm

 

 

3. Optically Contacted Zero-Order Waveplate   

 

• Optically Contacted
• Thickness 1.5~2mm
• Double Retardation Plates
• Broad Spectral Bandwidth
• Wide Temp. bandwidth

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/300 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: 532nm, 632.8nm, 800nm, 850nm, 980nm, 1064nm, 1310nm, 1550nm

 

 

4.Cemented Zero-Order Waveplate    

 

Cemented by Epoxy
Better Temperature Bandwidth
Wide Wavelength Bandwidth

AR Coated, R<0.2%

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/500 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: 266nm, 355nm, 532nm, 632.8nm, 800nm, 850nm, 980nm, 1064nm, 1310nm, 1550nm

 

 

5. Air Spaced Zero-Order Waveplate 

 

Double Retardation Plates
AR Coated,R<0.2% and Mounted
High Damage Threshold
Better Temperature Bandwidth
Wide Wavelength Bandwidth

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/300 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: 266nm, 355nm, 532nm, 632.8nm, 800nm, 850nm, 980nm, 1064nm, 1310nm, 1550nm

 

 

6.Single Plate Ture Zero-order Waveplate    

 

1.Broad Spectral Bandwidth
2.Wide Temperature .Bandwidth
3.Wide Angle Bandwidth
4.High Damage Threshold

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/500 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: 1310nm, 1550nm

 

 

7.Cemented Ture Zero-Order Waveplate   

 

Cemented by Epoxy
Wide Angle Acceptance
Better Temperature Bandwidth
Wide Wavelength Bandwidth

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/500 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: 532nm, 632.8nm, 800nm, 850nm, 980nm, 1064nm, 1310nm, 1550nm

 

 

8.Dual-Wavelength Waveplate   

 

• Single retardation plate
• DBAR Coating
• Unmounted

Material: Optical grade Crystal Quartz
imension Tolerance: +0.0, -0.2mm
Wavefront Distortion: <1/8lambda@633nm
Retardation Tolerance: <1/100 lambda
Surface Quality: 20/10 Scratch and Dig
AR Coating: R<0.2% at center wavelength
Standard wavelength: lambda @1064nm + 1/2lambda @532nm; 1/2lambda @1064nm + lambda@532nm 

 

 

9.Fresnel Rhomb Retarder   

 

 

Material: BK7, UVFS
Flatness: 1/10 lambda @632.8nm
Lambda Range: 400-2000nm for BK7
                           200-2000nm for UVFS

 

 

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