Planar second-harmonic generation with noncollinear pumps in disordered media

Vito Roppo, David Dumay, Jose Trull, Crina Cojocaru, Solomon M. Saltiel, Kestutis Staliunas, Ramon Vilaseca, Dragomir N. Neshev, Wieslaw Krolikowski, Yuri S. Kivshar
2008 Optics Express  
We study experimentally the process of the second harmonic generation by two noncollinear beams in quadratic nonlinear crystals with a disordered structure of ferroelectric domains. We show that the second-harmonic radiation is emitted in the form of two cones as well as in a plane representing the cross-correlation of the two fundamental pulses. We demonstrate the implementation of this parametric process for characterisation of femtosecond pulses, enabling the estimation of pulse width,
more » ... pulse width, chirp, and front tilt. This is achieved through monitoring the evolution of the autocorrelation trace inside the nonlinear crystal.
doi:10.1364/oe.16.014192 pmid:18773029 fatcat:p3xsx2rebvad3ibv2chlf6xwrm