  It is known that photon pairs generated from pulse-pumped spontaneous
parametric processes can be described by independent temporal modes and form a
multi-temporal mode entangled state. However, the exact form of the temporal
modes is not known even though the joint spectral intensity of photon pairs can
be measured by the method of stimulated emission tomography. In this paper, we
describe a feedback-iteration method which, combined with the stimulated
emission method, can give rise to the exact forms of the independent temporal
modes for the temporally entangled photon pairs.
