Abstract
Mode purity is a vital quality reference of an optical vortex. This work proposes a self-interference method to directly measure the mode purity of a single component in known superposed optical vortices, based on the modified phase-shifting technology we proposed. This method has excellent flexibility, rapidity, and robustness, which can be applied to various occasions and harsh conditions. Careful alignment and optimized error analysis allow us to generate and measure optical vortices with mode purity as high as 99.997%.
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