Abstract
Abstract : The intensity of the second harmonic light in total reflection and in transmission from uniaxial KDP crystals immersed in an optically denser liquid l-bromonaphthalene have been measured as a function of angle of incidence of the fundamental beam from a mode locked Nd:glass laser. The results agreed well with the theoretical predictions of theory given by Bloembergen and Pershan. In particular, the existence of a Nonlinear Brewster's angle of a transparent medium (KDP), with nonlinear polarization in the plane of reflection, has been first demonstrated. The transmitted second harmonic intensity under noncollinear phase matched condition by means of two beam spatial mixing (TBSM) in the KDP crystal, using Q-switched Nd:glass laser pulses, was observed as a function of the angle of incidence. The result was in good agreement with the theory of Bloembergen and Pershan. As a consequence, this result was used to measure the second order intensity auto-correlation function of Nd:glass laser radiation.
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