Spotlight summary: The concept of quasi-phase-matching (QPM) was introduced at the very beginning of the era of lasers and nonlinear optics as a generic method to increase the efficiency of second order nonlinear interactions. However, it was not until the early 90’s, with the introduction of periodically poled ferroelectrics obtained by electric field poling that the technique began to blossom as an engineering tool to tailor nonlinear interactions.
Last modified Wed, 3 Apr, 2013 at 9:23
From the Stanford News service:
"Stanford researchers demonstrate the first step in a scalable quantum cryptography system that could lead to uncrackable telecommunications."
Last modified Thu, 15 Nov, 2012 at 19:02
By John Wallace
Long-wavelength pumped, periodically poled lithium niobate waveguides upconvert single photons, allowing efficient, low-noise silicon avalanche photodiodes to detect the signal.
Last modified Fri, 25 May, 2012 at 11:23