Abstract
The intensity of a second-harmonic light beam generated in potassium dihydrogen phosphate (KDP) crystals immersed in the optically dense fluid 1-bromonaphthalene has been observed as a function of the incident angle of the fundamental beam of a mode-locked neodymium glass laser. The laser pulses have polarization in the [11\ifmmode\bar\else\textasciimacron\fi{}0] direction with respect to the KDP crystallographic axes. The phase-matchable second-harmonic generation at total reflection and in the vicinity of the critical angle were performed. The existence of a nonlinear Brewster angle has been demonstrated and its utilization may include using a null method for a precise measurement of the relative magnitude of nonlinear optical susceptibility components of materials. The results agree well with the theory of Bloembergen and Pershan [Phys. Rev. 128, 606 (1962)].
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