Waveplates Optical Waveplate Windows - China
price: contact company for price
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 varies
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 α is phase difference; d is thickness of
waveplate; ne, no are refrective 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.
λ/ 2 Waveplates
The thickness of a half waveplate is such that the phase difference is 1/2-wavelength (λ/2, true zero
order) or certain multiple of 1/2-wavelength ((2n+1)λ/2, multiple order).
A linearly polarized beam incident on a half waveplate emerges as a linearly polarized beam but rotated
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 to rotate the plane of
polarization, electro-optic modulation and as a variable ratio beamsplitter when used in conjunction with
a polarization cube.
λ/ 4 Waveplates
The thickness of the quarter waveplate is such that the phase difference is 1/4-wavelength (λ/4, true zero
order) or certain multiple of 1/4-wavelength ((2n+1)λ/4, multiple order).
If the angle θ (between the electric field vector of the incident linearly polarized beam and the retarder
principal plane) of the quarter waveplate is 45 degree , the emergent beam is ircularly 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 certain angle.
Quarter waveplate are used in creating circular, ellipsometry, optical
pumping, suppressing unwanted reflcetion and optical isolation.
Company Contact:
- Posted By: paradise photonics,INC.
- Phone: 8659183852091
- Address: D/2F,NO.A6 Baihuazhou Road,Pushang Industry Park,C, Fuzhou , China
- Email:
Published date: August 18, 2012
- Business Description: involved in international trade import export of goods, products, and services
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