High power waveplate
Low order waveplate
Zero order waveplate
True zero order waveplate
Dual wavelength waveplate
Fresnal Rhomb Retarder
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(neno)/λ, where α is phase difference; d is thickness of waveplate; ne,no are refractive 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.
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.
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°, the emergent beam is circularly polarized. When a quarter waveplate is double passed, i.e. by mirror reflection, it acts as a half waveplates and rotates the plane of polarization to a certain angle. Quarter waveplate are used in creating circular polarization from linear or linear polarization from circular, ellipsometry, optical pumping, suppressing unwanted reflection and optical isolation.
The zero order waveplate is designed to give a retardance of zero full waves, plus the desired fraction.Zero order waveplate shows better performance than multiple order wavepalte.It has broad bandwidth and a lower sensitivity to temperature and wavelength changes.It should be considered for more critical applications。
|<1 arc second
|1inch ring Holders for Waveplate or customer request
Note:wavelengths within the range of 240-2300nm are also available upon request.
Zero Order Waveplates Optically Contacted
High Damage Threshold
Better Temperature Bandwidth
Wide Wavelength Bandwidth
True Zero Order Waveplate
This type of waveplate is constructed of a true zero order waveplate and a BK7 substrate.As the waveplate is very thin and easy to be damaged,the BK7 plates function is to strengthen the wavepalte.
- Cemented by Epoxy
- Wide Angle Acceptance
- Better Temperature Bandwidth
- AR Coated,R<0.2%
True Zero Order Waveplate Single Waveplte
This type of waveplate is made of a very thin quartz waveplate which function as true zero order.In some cases ,the thickness required for single true zero order waveplates is too thin,they have to be provided as first order waveplate.
λ/4: 1310nm, 1480nm, 1550nm
λ/2: 980nm, 1064nm, 1310nm,1480nm, 1550nm
Low order waveplate
The low order waveplate which can be replaced by mulit-order waveplate is designed to give a retardace of several full waves,plus the desired fraction.This results in a single,physically robust component with desired performance.However,even small varitation in wavelength or temperature will result in significant changes in the desired fraction retardance.
|<1 arc second
|1inch ring holder for waveplate or customer request
|632.8nm, 780nm, 808nm, 980nm, 1064nm, 1310nm, 1550nm