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25 April 2012 Spatial control of second-harmonic light from a disordered structure
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The second harmonic light generated in crystals with a random distribution of nonlinear domains is usually emitted in a broad range of directions. When the fundamental light has good coherence, the intensity of the second harmonic shows a speckle pattern even when the crystal is transparent. We explain that with the interference at the detection point of the second harmonic generated by the different domains. Using a phase-only spatial light modulator in the fundamental beam, it is possible to concentrate the second harmonic intensity in one direction at the same time that the intensity is reduced in the other directions. In our experiments we measured enhancements in the selected direction up of 700 times over the average intensity in other directions.
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Francisco J. Rodríguez, Can Yao, Jorge Bravo-Abad, and Jordi Martorell "Spatial control of second-harmonic light from a disordered structure", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84251D (25 April 2012);

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