Upconversion detection near 2  μm at the single photon level

Date: 2013-11-20
Authors Guo-Liang Shentu, Xiu-Xiu Xia, Qi-Chao Sun, Jason S. Pelc, M. M. Fejer, Qiang Zhang, and Jian-Wei Pan
Journal No. Optics Letters 38, 4985 (2013)
Abstract We have demonstrated upconversion detection at the single photon level in the 2 μm spectral window using a pump wavelength near 1550 nm, a periodically poled lithium niobate (PPLN) waveguide, and a volume Bragg grating (VBG) to reduce noise. We achieve a system photon detection efficiency of 10%, with a noise count rate of 24,500 counts per second, competitive with other 2 μm single photon detection technologies. This detector has potential applications in environmental gas monitoring, life science, and classical and quantum communication.