Biphoton interference with a multimode pump
A. V. Burlakov, Maria V. Chekhova, O.A. Karabutova, S. P. Kulik · Physical Review A · 2001
We study the interference of biphotons generated via spontaneous parametric down-conversion from a pump with several longitudinal modes. It is shown that biphotons can interfere if the time difference between their birth moments is a multiple, to an accuracy of the pump coherence time, of $T\ensuremath{\equiv}2L/c,$ where L is the pump cavity length. This effect, although observed with a cw pump, is similar to a recently reported interference of biphotons generated from time-separated pump pulses.