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Polarization Control with Optics

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Polarization Control with Optics

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Precise control of polarization behavior is necessary to obtain optimal performance from optical components and systems. Characteristics such as reflectivity, insertion loss, and beamsplitter ratios will be different for different polarizations. Polarization is also important because it can be used to transmit signals and make sensitive measurements. Even though the light intensity may be constant, valuable information can be conveyed in the polarization state of an optical beam. Deciphering its polarization can reveal how the beam has been modified by numerous material interactions (magnetic, chemical, mechanical, etc.). Sensors and measurement equipment can be designed to operate on such polarization changes. For these reasons, optical components capable of filtering, modifying, and characterizing a light source's polarization are valuable. Such polarization control can be accomplished by exploiting the reflection, absorption, and transmission properties of materials used in these components.

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