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Photox Waveplates
Waveplates are made from materials which exhibit birefringence. The velocities of the extraordinary and ordinary rays passing throught the birefringent material vary inversely with their refractive indices.
Waveplates are used in Fiber Optical Isolators,
Circulators, Electro-optic modulation etc. Large quantities are available from
with high discounts for OEM customers.
Quarter Waveplate
A Quarter Waveplate is used to convert linearly polarized beams into
circularly polarized beams. This occurs when the thickness of the Quarter Waveplate is
such that the phase difference is (n+1/2)p . The construction
of a Quarter Waveplate is such that the fast axis lies in the surface at 45o
to the input polarization. The input beam is therefore resolved
into two components of equal amplitude but varying velocities.
Half Waveplate
The thickness of a Half Waveplate is such that the phase difference is np . A linearly polarized beam incident on a Half Waveplate emerges as a linearly polarized beam but rotated such that its angle to the optic axis is twice that of the incident beam.
Standard 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 |
Retardation: |
l/2, l/4, l |
AR Coating: |
R<0.2% at center wavelength |
Standard Wavelength: |
1310nm and 1550nm |
Standard Size: |
1.25x1.25mm,12.7x12.7mm, f 10mm, |
Waveplates of other dimensions and wavelengths are also available.