Abstract
The polarization state is modulated by tilting birefringence component placed
in the feedback external cavity. The variation of the polarization state in one
period of modulation is found to be similar to sine wave. The periods become
increasingly smaller. The maximum of variation in one period decreases against the
rotated angle. The experimental phenomenon is subjected to the change of optical
path and secondary reflection. The phenomenon is analyzed theoretically based on
geometrical optics and crystal optics. High-accuracy measurements of absolute and
relative angles can be realized based on the experimental phenomenon. The angle
resolution is 0.1 arcsec in theory.
© 2012 Chinese Optics Letters
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