Demonstration of an optical polarization magnifier with low birefringence

Details Demonstration of an optical polarization magnifier with low birefringence Demonstration of an optical polarization magnifier with low birefringence

2004-10-07

arxiv.org/abs/physics/0410044v5

Review of Scientific Instruments 76 (2005) 043102

Physics

Optics

08 october 2004

Scientific paper

10.1063/1.1879292

In any polarimetric measurement technique, enhancing the laser polarization change of a laser beam before it reaches the analyzer can help in improving the sensitivity. This can be performed using an optical component having a large linear dichroism, the enhancement factor being equal to the square root of the ratio of the two transmission factors. A pile of parallel plates at Brewster incidence looks appropriate for realizing such a polarization magnifier. In this paper, we address the problem raised by the interference in the plates and between the plates, which affects the measurement by giving rise to birefringence. We demonstrate that wedged plates provide a convenient and efficient way to avoid this interference. We have implemented and characterized devices with 4 and 6 wedged plates at Brewster incidence which have led to a decisive improvement of the signal to noise ratio in our ongoing Parity Violation measurement.

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