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Setup to measure the STOC efficiency and the state purity. Legend: QWP-quarter wave plate, PBS-polarizing beam-splitter. The fork hologram was inserted on the converted beam arm for verifying the degree of purity of the OAM mode generated on the output.
STOC power fraction (black squares) and no STOC power fraction (empty squares) as functions of the QP temperature. The curve is the best fit obtained as explained in the text.
Calculated far-field patterns of OAM modes and generated by the QP for input OAM [the input beam was assumed to (Ref. 18) mode]. The dashed circle shows the discriminating area used in the balanced mode sorter.
The QPs efficiency as a mode sorter.
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