We demonstrate efficient generation of collinearly propagating, highly nondegenerate photon pairs in a periodically-poled lithium niobate cw parametric downconverter with an inferred pair generation rate of 1.4*10^7/s/mW of pump power. Detection of an 800-nm signal photon triggers a thermoelectrically-cooled 20%-efficient InGaAs avalanche photodiode for the detection of the 1600-nm conjugate idler photon. Using single-mode fibers as spatial mode filters, we obtain a signal-conditioned idler-detection probability of about 3.1%.
@article{arxiv.quant-ph/0207156,
title = {Efficient generation of tunable photon pairs at 0.8 and 1.6 micrometer},
author = {Elliott J. Mason and Marius A. Albota and Friedrich Koenig and Franco N. C. Wong},
journal= {arXiv preprint arXiv:quant-ph/0207156},
year = {2009}
}