Laser
beam polarization state including linear polarization,
elliptical polarization, circular polarization, or arbitrary
polarization, which use polarization degree present polarization
characteristics. Polarization purity reflected by unwanted
polarization contained in the polarization, it is usually
referred to extinction ratio which is expressed as a percentage
of possession. Both polarization degree and extinction ratio are
the constraint quality to describe polarization state.
Test method, laser beam vertically incident into
power meter through Glan prism. Firstly record Glan prism
original position, and then record each rotation angle value and
power output value, The rotation angle interval can be decided
according to required measurement curve accuracy, until rotating
360 degree to complete measurement. Link the points in
coordinate system which with angle value as abscissa, energy
value as ordinate, the curve characteristics reflect the
polarization state. |
