Abstract
Flow of magnetic flux, initiated by visible light, has been observed in a ceramic YBa 2Cu 3O x rf SQUID operated at 77 K in the nonhysteretic mode. The response of the SQUID to the applied optical power density is linear and has a coefficient of conversion ∼90 φ 0/mW Oe, in units of the flux quantum φ 0. Experiments made with illuminating a piece of the SQUID material inserted into its coupling hole show that the induced flux motion has exponential time dependence, especially at small time values. No influence of light on the 1/ f noise figure of the SQUID was observed.
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