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Principles of Waveplate

 

Waveplates (retardation plates or phase shifters) are made of 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.

 

Half Waveplate         

The thickness of a half waveplate is such that the phase difference is 1/2-wavelength (true-zero order) or some multiple of 1/2-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 wavelength (true-zero order) or some multiple of 1/4 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.

 

 

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.

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

 

Specifications:

Material:

Optical grade Crystal Quartz and Mg:F2

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/4@633nm

Retardation Tolerance:

<l/50

Surface Quality:

20/10 Scratch and Dig

AR Coating:

R<1% at center wavelength

Standard wavelength:

VIS:465-610nm, NIR:700-1000nm, IR:1200-1650nm


Low Order Waveplate

• Thickness: 0.2-0.5 mm

• High Damage Threshold

• Low Cost

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

 

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/300

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

 

 Zero Order Optically Contacted Waveplate

• Optically Contacted

• Thickness 1.5~2mm

• Double Retardation Plates

• Broad Spectral Bandwidth

• Wide Temp. bandwidth

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/300

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

 

Zero Order Cemented Waveplate 

Cemented by Epoxy 
Better Temperature Bandwidth 
Wide Wavelength Bandwidth 
AR Coated, R<0.2%

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

 

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/300

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

 

Zero Order Air-Spaced Waveplate 

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

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/300

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

 

True Zero Order Waveplate

Single Plate True Zero order Waveplate  

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

Diameter

2x2

f 10

f 12.7.0

f 15.0

f 20

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/300

Surface Quality:

20/10 Scratch and Dig

AR Coating:

R<0.2% at center wavelength

Standard wavelength:

1310nm, 1550nm

 

Cemented True Zero Order Waveplate

Cemented by Epoxy

Wide Angle Acceptance

Better Temperature Bandwidth

Wide Wavelength Bandwidth

             

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/300

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

 

Dual-Wavelength Waveplate

 

• Single retardation plate

• DBAR Coating

• Unmounted

              

Diameter

f 10.0

f 12.7

f 15.0

f 20.0

f 25.4

Specifications:

Material:

Optical grade Crystal Quartz

Dimension Tolerance:

+0.0,-0.2mm

Wavefront Distortion:

<l/8@633nm

Retardation Tolerance:

<l/100

Surface Quality:

20/10 Scratch and Dig

AR Coating:

R<0.2% at center wavelength

wavelength:

 l @ 1064nm + l/2 @ 532nm

 l/2 @ 1064nm + l @ 532nm

 

 

Mounts and Holders

Ring Mount

     

Material and finished: 

Dimension Tolerance:
 

Black anodized aluminum 

±0.1mm 

 

 

F (mm)

T(mm)

Aperture(mm)

CA(mm)

15.0

6.0

8.0

7.0

25.4

6.0

8.0

7.0

25.4

6.0

10.0

9.0

25.4

6.0

12.7

11.5

25.4

6.0

15.0

13.5

30.0

6.0

15.0

13.5

30.0

6.0

20.0

18.0

30.0

6.0

25.4

22.8

 

 

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