Generation of second harmonic of light in crystals with resonant impurities
Zel'dovich B. Ya., Kuz'michev S. D.
A light wave induces an oscillating dipole moment in a resonant impurity; its field in the near zone exceeds the macroscopic field and a second harmonic can be efficiently excited on the quadratic nonlinearity of the matrix. A calculation and estimates of the effect are given for the case in which the exciting wave propagates in the self-induced transparency regime.