We developed a device to measure the
Stokes parameters which represent the polarization state
of the light by using a material called PLZT which is
controllable from the computer.
The polarizaiton state of the light is
represented by Stokes vector which is a 4D vector. PLZT
is transparent ceramics, and has a birefringency
depending on the voltage. First, we take an image with
the camera where ND filter and PLZT is in front of it.
Next, we set a linear polarizer in front of the camera,
and set a PLZT in front of the ND filter. Then, we take
an image with no voltage to the PLZT. When we set a
certain voltage to PLZT, PLZT acts as a quarter
waveplate. Here, we take an image. If we set another
value of voltage to PLZT, PLZT acts as a half waveplae.
We also take an image. From these four images, we
calculate the parameters of Stokes vector.
Almost all of this research is performed by
Furuuchi Chemical Corporation. |
