Optical diode effect induced by two laser beams in a Mn-doped KNSBN crystal

Two laser beams at 632.8 nm meet in a Mn-doped KNSBN crystal and induce an optical diode. A maximum ratio of 202 for equivalent transmissivity in the two opposite directions of the optical diode is obtained at input powers of 0.876 mW and 0.091 mW, respectively and the ratio shows a tendency to increase further