To create circularly polarized light, you require a circular polarizer. A linear polarizer by itself is not enough to create circularly polarized light. A circular polarizer is really just a linear polarizer followed by a quarter-wave plate (also known as a retarder) that is at 45° with respect to the axis of polarization.
In short, you can either use a circular polarizer, or combine a linear polarizer and retarder film to create circularly polarized light.
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