Measuring device and method of influences of transflective medium on orbital angular momentum (OAM) of photons

The invention discloses a measuring device and method of influences of a transflective medium on orbital angular momentum (OAM) of photons. The device comprises a driving power source (1), a laser head (2), a beam expander (3), a spiral phase plate (4), a reflective range increasing cavity (5), a double slit baffle (6), a light screen (7), a measuring head (8), a CCD camera (9) and a computer (10). A Laguerre Gaussian laser is emitted by the laser head (2), then is given spiral phase distribution through the spiral phase plate (4) after beam expanding of the beam expander (3), passes through the reflective range increasing cavity (5) to be continuously reflected, and then passes through the double slit baffle (6) to generate two coherent light beams; and the light screen (7) carries out imaging on a double slit interference result, converted signals are measured through the measuring head (8) and the CCD camera (9), and a measuring result is displayed on the computer (10). According tothe device and the metho