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Harmonic generation from non-cumulative fundamental symmetric (S0) and antisymmetric (A0) modes in plate is studied from a numerical standpoint. The contribution to harmonic generation from material nonlinearity is shown to be larger than that from geometric nonlinearity. Also, increasing the magnitude of the higher order elastic constants increases the amplitude of second harmonics. Second harmonic generation from non-phase-matched modes illustrates that group velocity matching is not a necessary condition for harmonic generation. Additionally, harmonic generation from primary mode is continuous and once generated, higher harmonics propagate independently. Lastly, the phenomenon of mode-interaction to generate sum and difference frequencies is demonstrated.
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http://dx.doi.org/10.1016/j.ultras.2014.04.009 | DOI Listing |
We demonstrate significant second harmonic generation (SHG) and sum frequency generation (SFG) on a thin-film lithium niobate (TFLN) platform by loading a silicon nitride (SiN) microring resonator, which avoids the dry etching of lithium niobate. By optimizing SiN-loaded TFLN waveguide geometry, the phase-matching conditions between the fundamental pump laser and the SHG/SFG signals are designed. Combining with enhancement by the microring resonator, remarkable SHG and SFG signals with conversion efficiencies of 16.
View Article and Find Full Text PDFNonlinear frequency upconversion of random fiber lasers can generate wavelength flexible visible light with low temporal coherence. In this work, we demonstrate wavelength-tunable blue light generation based on frequency tripling of a random Raman fiber laser (RRFL) in two cascaded periodically poled lithium niobate (PPLN) crystals. The RRFL can deliver watt-level and narrowband lasing in the spectral range of 1412-1435.
View Article and Find Full Text PDFWe study the dynamics and stability of soliton optical frequency comb generation in a dissipative, coherently pumped cavity with both second- and third-order nonlinearity. Cavity sweep simulations and linear stability analysis based on path continuation reveal the existence of bistable solitons. These families of solitons represent a continuous transition between a purely quadratic and a Kerr cavity soliton frequency comb.
View Article and Find Full Text PDFWe present a novel, to the best of our knowledge, fiber-optic radio frequency (RF) phase synchronization scheme utilizing frequency division multiplexing, eliminating the need for a time reference. The method begins by generating two homologous RF signals with an integer multiple frequency relationship. These signals are then modulated onto the same laser carrier through intensity modulation.
View Article and Find Full Text PDFOptical coating, an integral part of many optical systems, is prone to damage from environmental exposure and laser irradiation. This underscores the need for reliable and sensitive coating diagnostics. We introduce second harmonic generation (SHG) as a method for the sensitive detection of defects and inhomogeneities within optical thin films.
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