Accession Number : ADA299595

Title :   Low-Frequency Noise Reduction in SQUID Measurements Using Laser Switching.

Descriptive Note : Final technical rept. 15 Jan 90-15 Jan 92,

Corporate Author : STANFORD UNIV CA DEPT OF PHYSICS

Personal Author(s) : Cabrera, Blas

PDF Url : ADA299595

Report Date : JUN 1992

Pagination or Media Count : 28

Abstract : Reduce SQUID noise in measurements which are intrinsically low frequency or dc. Such low frequency measurements fall below the 1/f knee of the noise energy spectrum and the SQUID performance is degraded substantially below the often quoted white noise levels. We intend to improve the low frequency noise using input circuit modulation at a frequency above the 1/f knee, up-converting the signal in frequency. In our scheme the noise should approach the SQUID white noise floor and the slew rates should approach the original SQUID system slew rate.

Descriptors :   *SUPERCONDUCTORS, *QUANTUM ELECTRONICS, *NOISE REDUCTION, LASER PUMPING, INTEGRATED SYSTEMS, FREQUENCY MODULATION, THIN FILMS, WHITE NOISE, SEMICONDUCTOR LASERS, SEMICONDUCTOR DIODES, MAGNETIC INDUCTION, MICROELECTRONICS, NIOBIUM, QUANTUM EFFICIENCY, OPTICAL SWITCHING, LOW FREQUENCY, ELECTRIC BRIDGES.

Subject Categories : Electrical and Electronic Equipment
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE