Abstract
We investigated the dependence of the birefringence of polystyrene (PS) film with a negative optical birefringence on the stretching conditions. We varied the stretching ratio (SR), stretching speed (SS), and stretching temperature (ST), and measured the inplane birefringence and the coefficient of the PS film. The inplane birefringence was increased with greater SR and SS but decreased with greater ST. The coefficient of the stretched PS film was around zero and showed similar dependence on the stretching conditions like inplane birefringence.
© 2018 Optical Society of America
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