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Search Publications by: Lijun Ma (Fed)

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Displaying 76 - 100 of 156

Ultra Low Dark-count-rate Up-conversion Single Photon Detector

November 7, 2010
Author(s)
Xiao Tang, Lijun Ma, Oliver T. Slattery
We have demonstrated an ultra low noise up-conversion single photon detector using a periodically poled lithium niobate waveguide. The dark count rate of this detector is lower than 100 counts/second with 10% detection efficiency.

Study on Noise Reduction in Up-conversion Single Photon Detectors

September 9, 2010
Author(s)
Lijun Ma, Oliver T. Slattery, Xiao Tang
Up-conversion single photon detector technology has been established as efficient for photons in near infrared range. However, its dark count rate is a major concern for some applications in quantum optics. We have theoretically and experimentally studied

Ultra Sensitive NIR Spectrometer Based on Frequency Up-conversion Detector

April 7, 2010
Author(s)
Lijun Ma, Oliver T. Slattery, Xiao Tang
We developed a spectrometer for signals at single photon levels in the near infrared (NIR) region based on a tunable up-conversion detector. This detector uses a 5-cm periodically poled lithium niobate (PPLN) waveguide to convert NIR photons to a shorter

Grating-Enhanced Narrow-Band Spontaneous Parametric Down Conversion

March 10, 2010
Author(s)
Xiao Tang, Lijun Ma
We propose a new method to narrow the linewidth of entangled photons from spontaneous parametric down conversion incorporated with an internal Bragg grating. We study and show that it is a promising way to generate narrow-line entangled photons.