A multiple layer reflective polarizer 12 is described. This element is placed between and optical cavity 24 and an LCD module 16 to form an optical display. The reflective polarizer reflects some light into the optical cavity 24 where it is randomized and may ultimately emerge with the correct polarization to be transmitted out of the display.

 
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> Angle-of-rotation measuring device and angle-of-rotation measuring method

> Method and apparatus for detecting ultrasonic surface displacements using post-collection optical amplification
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