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We experimentally investigate a double-pass parametric down-conversion schemefor producing pulsed, polarization-entangled photon pairs with high visibility.The amplitudes for creating photon pairs on each pass interfere to compensatefor distinguishing characteristics that normally degrade two-photon visibility.The result is a high-flux source of polarization-entangled photon pulses thatdoes not require spectral filtering. We observe quantum interference visibilityof over 95% without the use of spectral filters for 200 femtosecond pulses, andup to 98.1% with 5 nm bandwidth filters.Comment: 8 pages, 6 figure

Optimal generation of pulsed entangled photon pairs