A periodically poled lithium niobate (PPLN) waveguide-based single-pixel up-conversion infrared spectrometer was demonstrated. Sum-frequency generation between a 1.5 micrometer band scanning pump laser and a 1.3 micrometer band signal generated visible radiation which was detected by a silicon single-photon detector. The noise equivalent power of the upconversion spectrometer was two-orders-of-magnitude lower than that of a commercial optical spectrum analyzer.
@article{arxiv.0810.4559,
title = {Waveguide-based single-pixel up-conversion infrared spectrometer},
author = {Qiang Zhang and Carsten Langrock and M. M. Fejer and Yoshihisa Yamamoto},
journal= {arXiv preprint arXiv:0810.4559},
year = {2009}
}