Phase matching in<i>β</i>-barium borate crystals for spontaneous parametric down-conversion
Phase matching in<i>β</i>-barium borate crystals for spontaneous parametric down-conversion
Spontaneous parametric down-conversion (SPDC) is the most widely used process for generating photon pairs entangled in various degrees of freedom such as polarization, time-energy, position-transverse momentum, and angle-orbital angular momentum (OAM). In SPDC, a pump photon interacts with a non-linear optical crystal and splits into two entangled photons called the …