Excitation of higher spatial harmonics by a moving light pattern in sillenites

McClelland, T.E.; Webb, David J.; Sturman, B.I.; Shamonina, E.; Mann, M. and Ringhofer, K.H. (1996). Excitation of higher spatial harmonics by a moving light pattern in sillenites. Optics communications, 131 (4-6), pp. 115-321.

Abstract

We investigate numerically the dependence of higher harmonics of the space-charge field on the detuning frequency between the pump waves, which form a running interference pattern. Bistability and hysteresis of harmonics are predicted for a contrast of the interference pattern m =(0.25-0.3). For contrasts m˜1 and small detuning frequencies we show the existence of a narrow resonance, connected with the nonlinear excitation of a slowly decreasing sequence of spatial harmonics. For experiments we use a BSO crystal in the optical configuration which avoids nonlinear optical distortions. The experimental data show good qualitative agreement with theory.

Uncontrolled Keywords: dependence, higher harmonics, space-charge field, detuning frequency, pump waves, interference pattern, bistability, hysteresis, narrow resonance, nonlinear excitation
Published Date: 1996-11-01

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