Figure 3 | SAAL-based multi-functional nonlinear light modulation (IMAGE)
Caption
Figure 3 | SAAL-based multi-functional nonlinear light modulation. a Schematic diagram of multi-functional nonlinear beam shaping using SAAL-produced photonic architectures. b Phase-matching principle for simultaneous generation of second-harmonic and third harmonic vortex light beams by constructing multi-layer fork-shaped gratings. kω, k2ω, and k3ω are the wavevectors of the fundamental, second-harmonic, and third harmonic waves, respectively. G1 and G2 are reciprocal vectors. Λ1 and Λ2 are periods of the multi-layer gratings. c second-harmonic generation power and efficiency as a function of fundamental power and layer number. Inset: spectrum of the second-harmonic beam. d Third-harmonic generation power and efficiency as a function of fundamental power at a layer number of 15 (detailed structure design see methods). Inset: spectrum of the third harmonic beam. e Schematic diagram of periodically inverted cascaded fork-shaped gratings that can make the second-harmonic and the third harmonic vortex beams with opposite topological charges interfere with each other, respectively. f Experimentally generated complex nonlinear light fields using the design presented in e. g Design (left) and fabrication (middle) of a compound nonlinear grating with more complex interior structures and the second-harmonic vortex arrays (right) generated by the fabricated structure. Scale bar: 50 μm.
Credit
Bo Zhang et al.
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CC BY