Abstract

The state-of-art technology of a quasi-phase matched (QPM) device has enabled the efficient generation of frequency-entangled photon pairs through parametric fluorescence [1, 2]. Harris [3] has proposed the generation of photon pairs which are correlated on a mono-cycle time scale of optical period. In that paper, the poling period of QPM device is linearly chirped (increased) from the entrance to the exit. Thus, each poling period is phase matched at different wavelengths of photon pairs, spanning ultra-broad spectrum. Recent experiment by Mohan et al as its application to quantum optical coherence tomography [4], has realized the parametric fluorescence from chirped-QPM device which is phase matched from 820nm to 1500nm using stoichiometric lithium tantalate (SLT) crystal as a nonlinear medium with 13% chirping (poling period: from 7.500µm to 8.500µm).

© 2011 IEEE