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By adding periodic signal into two-mode laser, we take the first-order approximation to the multiplication noise of the laser intensity equation, and use a linear approximation to calculate the correlated function and power spectrum.
The analysis of shock wave propagation and the calculation of energy dissipation property in the density-grade thin-plate show that higher peak shock pressure is produced in it, and it has longer pressure duration time.In this paper, 1 1 dimensional nonlocal fundamental and second-order surface dark solitons have been found numerically at the interface between thermal nonlinear medium and linear medium.The relation between the wave shape of nonlocal surface dark soliton and propagation constant and nonlocality degree is investigated.On this basis we study the temperatures and bending characteristics of the two stopbands and one passband.The results show that the temperature sensitivities of the two stopbands and one passband are all approximately 0.05 nm/℃; the bending sensitivity of the passband (2.61 nm/m In this pager, we theoretically propose a model for low-frequency multi-channel filtering of phononic crystal composed of locally resonant units By introducing the resonance units with different filling rates into two-dimensional three-component locally resonant phononic crystal, a waveguide is built Its band structure transmission curve and transmitted sound pressure field map are calculated by the finite element method This design results in a low frequency range of the band gap emergence of new discrete mode around the different resonant frequencies of the scatterer These discrete modes enable the corresponding sound wave to propagate along the waveguide direction in phononic crystal waveguide The discrete model is only associated with the respective resonant unit, so it has a strong anti-jamming capability It provides a new theoretical basis for the multi-channel low-frequency filter.A novel type of slow-wave structure for Smith-Purcell device called dielectric loaded metal grating, is proposed in this article.
The “hot” dispersion align of the structure is obtained by using the eigen-function method and single-mode approximation.
And 5 m long fiber can reach 8.12 W continuous laser output, in which the slope efficiency is 55.9% and performs good amplification effect.
Besides, the extinction ratio is about 10 d B, which indicates good polarization performance of the fiber.
The first-and second-order growth rate of beam-wave interaction are obtained at the synchronization point.
The effects of grating groove width and depth on dispersion characteristic are analyzed, and the influences of electron beam parameters and distance between electron beam and grating surface on growth rate characteristic are also studied.
Through simulated calculation, the mode area of the double clad polarization maintaining photonic crystal fiber reaches about 232 μm.