Two common types of waveplates are the half-wave plate, which shifts the polarization direction of linearly polarized light, and the quarter-wave plate, which converts linearly polarized light into circularly polarized light and vice versa. A quarter-wave plate can be used to produce elliptical polarization as well.
Polarizers or also called waveplates are constructed out of a birefringent material (such as quartz), for which the index of refraction is different for light linearly polarized along one or the other of two certain perpendicular crystal axes.
Polarization components are used in imaging applications to reduce glare or hot spots, enhance contrast, or to perform stress evaluations. Polarization can also be used to measure changes in magnetic fields, temperature, molecular structures, chemical interactions, or acoustic vibrations. Polarizers are used to transmit a specific polarization state while blocking all others. Polarized light can have linear, circular, or elliptical polarization.
The behaviour of a waveplate (that is, whether it is a half-wave plate, a quarter-wave plate, etc.) depends on the thickness of the crystal, the wavelength of light, and the variation of the index of refraction. By appropriate choice of the relationship between these parameters, it is possible to introduce a controlled phase shift between the two polarization components of a light wave, thereby altering its polarization.
Lobre’s high performance Thin Film Polarizers are made with state-of-the-art thin film vapour depositing coating technology for optimal performance. The polarizers are available with polarizing coatings on both sides of the polarizers, or a polarizing coating on the input face and a high quality multilayer anti-reflection coating on the output face. Please contact Lobre for further information or requests for quotation.