Laser activated superconducting switch

Details Laser activated superconducting switch Laser activated superconducting switch

1974-12-16

1976-05-11

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

174 15CA, 307245, 307306, 335216, 357 18, H01C 716

Patent

active

039567273

ABSTRACT:
A superconducting switch or bistable device comprising a superconductor in a cryogen maintaining a temperature just below the transition temperature, having a window of the proper optical frequency band for passing a laser beam which may impinge on the superconductor when desired. The frequency of the laser is equal to or greater than the optical absorption frequency of the superconducting material and is consistent with the ratio of the gap energy of the switch material to Planck's constant, to cause depairing of electrons, and thereby normalize the superconductor. Some embodiments comprise first and second superconducting metals. Other embodiments feature the two superconducting metals separated by a thin film insulator through which the superconducting electrons tunnel during superconductivity.

REFERENCES:
L. R. Testardi, Destruction of Superconductivity by Laser Light, "Physical eview," B, Vol. 4, No. 7, pp. 2189-2196, Oct. 1, 1971.
Chang and Scalapino, New Instability in Superconductors under External Dynamic Pair Breaking, "Physical Review," B, Vol. 10, No. 9, Nov. 1, 1974, pp. 4047-4049.

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