Abstract
We numerically and experimentally investigated the nonlinear Raman-Nath second harmonic generation of hybrid structured fundamental wave whose phase modulation combined periodic and random structure. The second harmonic generation of both one- and two-dimensional hybrid structured fundamental wave were investigated in this paper. The results show that more diffraction spots can be obtained in these hybrid structures than the pure periodic modulation cases. Besides, the total intensity of the second harmonic not only can be dramatically enhanced without altering the diffraction angles, but also is increasing with the degree of randomness of the structure. This study enriches the family of second harmonic generation of structured fundamental wave and has potential application in dynamically controlling second harmonic wave in arbitrary directions.
Highlights
The structural property of the matter always play an important role in many physics processes, in other words, many physics phenomena can be realized and controlled by this kind of structure
In the field of nonlinear optics, lots of studies have introduced these structures into nonlinear photonic crystals (NPCs) [4,5], in which the second-order susceptibility χ (2) is spatially modulated while the linear susceptibility remains constant for the second harmonic generation (SHG) processes
The phase of the fundamental wave (FW) was modulated by a XY Phase Series spatial light modulator (SLM) which produced by the BNS Company of America
Summary
The structural property of the matter always play an important role in many physics processes, in other words, many physics phenomena can be realized and controlled by this kind of structure. In the processes of shaping the SH, most attention paid on the structures of nonlinear medium The disadvantages of this method are complex fabrication and unchangeable SH pattern. We have proposed and experimentally demonstrated that nonlinear Raman-Nath SH [18] and scattering-assisted SH [19] can be achieved when a structured FW incident in a homogeneous nonlinear medium. These papers only discussed the SHG of periodically modulated FW. We numerically and experimentally investigated the nonlinear Raman-Nath SHG of hybrid structured FW whose phase modulation combined periodic and random structure. We characterize the intensity dependence of nonlinear Raman-Nath diffraction on the degree of randomness of the structure, which shows that the randomness only affects the intensity of the diffraction signal, but have no effect on the emission angles
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