Spontaneous parametric down-conversion (SPDC) is the most common source in
quantum optics for generating correlated photon pairs. Yet, the low efficie
ncy reduces its applicability. By placing the crystal in a linear cavity fo
r the pump mode we achieved a factor of 7 enhancement of the pair productio
n rate, thus enabling improved experiments and bringing an all-solid state
source of NIR (C) 2000 Elsevier Science B.V. All rights reserved.