Monday, February 20, 2006

Week of 2-6-06

The following project tasks were completed this week:

LC device ordered from Colorlink. After speaking with Dr. Blair upon his return from PW Conference, I found that the device John was describing was a variable liquid crystal retarder capable of varying polarization angles over a 90 degree range based on a linear input voltage. When placed in between a set of crossed polarizers (polarizers oriented at 90 degrees) at a 45 degree angle, and the control voltage of the LC device is driven by a function generator outputing a sinusoidal voltage signal of the desired frequency, the optical intensity transmission through the LC retarder/cross polarizer will also vary sinusoidally.

During the wait before the LC device was received, basic information was obtained regarding response times and transmission properties of LC retarders through web searches and a literature review of the subject.


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