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Fig. 1 | PhotoniX

Fig. 1

From: Underwater transmission of high-dimensional twisted photons over 55 meters

Fig. 1

Experimental implementation. a. Real field-test environment. b. Sketch of the experimental setup. The single-photon twisted light is generated using a modified Sagnac loop with a vortex phase plate (VPP) placed inside the loop. The Sagnac loop can operate in both single-directional and bidirectional circulation by preparing the polarization of incident photons with a half wave plate (HWP) and a quarter wave plate (QWP) before the loop. After superposition states or pure states going through the underwater channel, their modal structures are measured with an ICCD camera. The inset shows typical classes of OAM states adopted for experimental tests. OD: neutral-density filter; PBS: polarization beam splitter; f1-f3: lens; BF: band-pass filter (532nm ±10nm); ICCD: intensified charge coupled device camera

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