High-speed optical detectors in YBCO films with non-granular and fine-grain morphologies

Q. Tang, A. Driessen, L.H. Hilderink, R.P.J. IJsselsteijn, J. Flokstra, Th.J.A. Popma

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Abstract

Optical detectors based on YBa2Cu3O7-δ thin films have been fabricated, which show a response time of a few ns. Typical dimensions of the active area are 10×10 μm2. No preamplifier is needed during operation. The authors report on the optical response of detectors having nongranular and fine-grain morphologies to different sources of pulsed laser radiation (e.g., mode-locked Nd:YLF laser at 1.3 μm and a GaAs diode laser at 0.9 μm). Emphasis in the study is placed on detection sensitivity for measuring short optical pulses. It is found that the best noise obtained with a fine-grain detector is on the order of 10-10 W/Hz1/2, when irradiated by the 65ns-pulse-width diode laser.
Original languageEnglish
Pages (from-to)2864-2868
Number of pages5
JournalIEEE transactions on applied superconductivity
Volume3
Issue number1
DOIs
Publication statusPublished - 1993
Event1992 Applied Superconductivity Conference, ASC 1992 - Chicago, United States
Duration: 23 Aug 199228 Aug 1992

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