Search

Your search keyword '"Zhai, Guang"' showing total 12 results
Start Over Author "Zhai, Guang" Publisher iop publishing
12 results on '"Zhai, Guang"'

11. Single-Photon Detection at Telecom Wavelengths.

Author

Sun Zhi, Ma Hai, Lei Ming, Wang Di, Liu Zhao, Yang Han, Wu Ling, Zhai Guang, Jie and, and Feng Ji

Subjects
PHOTON detectors, NUCLEAR counters, AVALANCHE photodiodes, AVALANCHE diodes
Abstract

A single-photon detector based on an InGaAs avalanche photodiode has been developed for use at telecom wavelengths. A suitable delay and sampling gate modulation circuit are used to prevent positive and negative transient pulses from influencing the detection of true photon induced avalanches. A monostable trigger circuit eliminates the influence of avalanche peak jitter, and a dead time modulation feedback control circuit decreases the afterpulsing. From performance tests we find that at the optimum operation point, the quantum efficiency is 12% and the dark count rate 1.5×10?6ns?1, with a detection rate of 500 kHz. [ABSTRACT FROM AUTHOR]

Published
2007
Full Text
View/download PDF

12. A Simple System to Measure Superconducting Transition Temperature at High Pressure.

Author

Yu Yong, Zhai Guang, Jie and, and Jin Chang

Subjects
*SUPERCONDUCTIVITY, *TRANSITION temperature, *TEMPERATURE measurements, *HIGH pressure (Science), *DIAMOND anvil cell, *MAGNETIC fields, *ELECTRIC properties of crystals
Abstract

A simple hydride system is fabricated to measure the superconducting transition temperature Tc under high pressure using a diamond anvil cell (DAC). The system is designed with centrosymetric coils around the diamond that makes it easy to keep balance between the pick-up coil and the inductance coil, while the superconducting states can be modulated with a low-frequency small external magnetic field. Using the device we successfully obtain the Tc evolution as a function of applied pressure up to 10 GPa for YBa2Cu3O6+d superconductor single crystal. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results