Three-dimensional characterization of the effective second-order nonlinearity in periodically poled crystals.
A novel technique for characterization of the second-order nonlinearity in nonlinear crystals is presented. It utilizes group-velocity walk-off between femtosecond pulses in type II SHG to achieve three-dimensional resolution of the nonlinearity. The longitudinal and transversal spatial resolution can be set independently. The technique is especially useful for characterizing quasi-phase-matched nonlinear crystals, and it is demonstrated in potassium titanyl phosphate.
Holmgren
Stefan J
SJ
Department of Physics, Royal Institute of Technology, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden. sh@laserphysics.kth.se
Pasiskevicius
Valdas
V
Wang
Shunhua
S
Laurell
Fredrik
F