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We propose a nonlinear optical frequency conversion method based on cascaded difference frequency generation. Feasible designs are presented that enable the cascaded optical waves. They are initially generated by cascaded difference frequency generation with two pump waves, then transferred to high-order Stokes waves by optimized cascaded differenc...
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We investigate the generation of optical third-harmonic frequency in quadratic crystals with a nonlinear domain lattice optimized with the aid of a random number generator. In the developed Monte Carlo algorithm and numerical experiments, we consider domain thicknesses to be taking either the values d1 or d2, with d1 and d2 being the coherence leng...
We directly observed terahertz (THz) waves generated in a cascading manner under noncollinear phase-matching conditions in a THz parametric generator. Although cascading induced by collinear phase matching has been extensively studied, cascading featuring noncollinear phase matching, using devices such as our injection-seeded THz parametric generat...
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Nonlinear optical effects are used to generate coherent light at wavelengths difficult to reach with lasers. Materials periodically poled or nanostructured in the nonlinear susceptibility in three spatial directions are called 3D nonlinear photonic crystals (NPhCs). They enable enhanced nonlinear optical conversion efficiencies, emission control, and simultaneous generation of nonlinear wavelengths. The chemical inertness of efficient second‐order nonlinear materials (χ(2)$\left(\chi\right)^{\left(\right. 2 \left.\right)}$) prohibits their nanofabrication until 2018. The current methods are restricted to top‐down laser‐based techniques limiting the periodicity along the z‐axis to 10 μm$10 \text{ } \mu \text{m} $. The first bottom‐up fabricated 3D NPhC is demonstrated in sol–gel‐derived barium titanate by soft‐nanoimprint lithography: a woodpile with eight layers and periodicities of 1 μm$1 \text{ } \mu \text{m} $ (xy$x y$‐plane) and 300 nm$300 \textrm{ } \textrm{ } \textrm{ } \text{nm}$ (z‐plane). The surface areas exceed 5.3×104 μm2$5.3 \times \left(10\right)^{4} \mu \left(\text{m}\right)^{2} $, which is two orders of magnitude larger than the state‐of‐the‐art. This study is expected to initiate bottom‐up fabrication of 3D NPhCs with a supremely strong and versatile nonlinear response.
We introduce an infrared laser generation scheme by cascaded difference frequency generation (CDFG) combined with optical parametric oscillator (OPO). An inventive infrared laser generator is proposed that enable cascaded optical waves, initially generated by CDFG in an aperiodically poled lithium niobate crystal, then continuously and repeatedly transferred to high-order Stokes waves by oscillations of cascaded optical waves, and finally brought out infrared laser from the high-order Stokes waves with specially designed OPO. We explain the physical mechanism of the above infrared laser generation process and demonstrate wide frequency tuning characteristics and high conversion efficiency characteristics of the infrared laser generator by providing theoretical research. The frequency tuning from pump frequency to 60 THz with a high conversion efficiency are realized by numerical calculations. The infrared laser generator exhibits physics distinctly different from lasers by atomic transitions, optical parametric oscillation or difference frequency generation. We consider that the infrared laser generator based on CDFG combined with OPO is promising for achieving high-efficiency and high-power infrared laser.
