Related Experiment Video
Updated: May 10, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
Published on: May 11, 2014
Ultralow noise up-conversion detector and spectrometer for the telecom band
Guo-Liang Shentu1, Jason S Pelc, Xiao-Dong Wang
1Shanghai Branch, National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai, 201315, China.
Abstract:
We demonstrate up-conversion single-photon detection for the 1550-nm telecommunications band using a PPLN waveguide, long-wavelength pump, and narrowband filtering using a volume Bragg grating. We achieve total-system detection efficiency of around 30% with noise at the dark-count level of a Silicon APD. Based on the new detector, a single-pixel up-conversion infrared spectrometer with a noise equivalent power of -142 dBm Hz(-1/2) was demonstrated, which was as good as a liquid nitrogen cooled CCD camera.
Related Concept Videos
UV–Vis Spectrometers
Upsampling
IR Spectrometers
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
UV–Vis Spectroscopy: Molecular Electronic Transitions
IR Frequency Region: Fingerprint Region
The...

