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STANDA in Lithuania
STANDA  P.Box.2684, LT-03001 Vilnius 9 P.O., Lithuania
Phone +370 5 2651474, Fax +370 5 2651483
E-mail: sales@standa.LT
   
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Home > Polarizing Optics > Waveplates - Brief Overview
Waveplate
 
Waveplates for any wavelength in 240-9000 nm range
 
Air-spaced ZO waveplates for high energy applications
 
Waveplates for many wavelengths are available from STOCK!!
 
Custom design waveplate asseblies are available on request!

Zero Order (ZO) waveplates are generally preferred since they are least sensitive to variations in wavelength, angle of incidence and temperature. To suit different applications, air spaced or optically contacted (see drawings on next page) Zero Order compensated phase retardation plates are available from Standa. The air-spaced construction enables to use the waveplate for the high power laser applications. The damage threshold is more than 500 MW/cm2.

Standa is offering wide range of Zero Order (ZO), Low order (LO) half (λ/2) or quarter (λ/4) waveplates for UV, VIS, NIR and IR (for any wavelength in 240-9000 nm range) Waveplates are made from materials which exhibit birefringence. The velocity of the extraordinary and ordinary rays through the birefringent material varies inversely with their refractive indices. This difference in velocities gives a rise to phase difference when two beams recombine. At any specific wavelength the phase difference is governed by the thickness of the retarder - waveplate. Half (λ/2) Waveplate. A linearly polarized beam incident on a half wave crystal quartz 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. Halfwaveplates are used to rotate the plane of polarization, electrooptic modulation and as a variable ratio beamsplitter when used in conjunction with a polarization cube. Quarter (λ/4) Waveplate - thin-film compensator. If the angle 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.

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