Waveplates
Waveplates change the state of polarisation. They resolve an incident beam of light into orthogonally polarised components and retard the phase of one component relative to the other. The emergent usually has a different polarisation state from the incident beam.
The most common type of retarder is a slice of birefringent material in which the o-ray travels at different velocities. Two rays that start in phase develop a phase difference with respect to each other. For light of wavelength ^ the phase difference 0 is given by:
0 = +- 2 (pie) d (ne-no)/^
Where:
d= thickness of waveplate
ne= refractive index for extraordinary ray
no= refractive index for the ordinary ray
We can offer multiple order and zero order wavelengths. Zero order wavelengths have higher acceptance angles, wide bandwidth and lower temperature coefficients than multiple order waveplates. Wavelenghts are within the range of 200 to 2300 nm
1/2 Wave Plate
A 1/2 waveplate is used in rotating the plane of linear polarisation
1/4 Wave Plate
A 1/4 wave plate is used in changing linear polarised light to circularly polarised or creating linear polarisation from circular.
Specifications
| Material: | Crystal Quartz |
| Dimension Tolerance: | +0.0, -0.2mm |
| Wavefront Distortion: | <^/8 @ 632.8mm |
| Retardation Tolerance: | <^/300 |
| Parallelism: | < 10 arc seconds |
| Surface Quality: | 20-10 scratch and dig |
| AR-Coating: | R < 0.2% at centre wavelength |
| Retardation: | <^/2, <^/4 |
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