The Generation And The Application Of High Energy Ultra-short Pulse Sources

Pulse width generated by ultra-short pulse laser can be achieved to femtosecond order of magnitude, which are widely used in various fields:optical information processing, laser printing, industrial processing and so on. Recently, along with the better performance of the fiber structure, high energy storage applications, ultrashort pulse fiber laser attracted widespread attention. Supercontinuum is generated due to self phase modulation, cross-phase modulation, four wave mixing effect. Supercontinuum has many practical applications: reduce the measurement time, widen the spectral measurement range. The research of supercontinuum generated has important theoretical and practical significance. SC spectrum with low cost, easy coupling with fiber, wide bandwidth optical frequency stability is widely used in the time-division multiplexing system. Fiber laser equipment is more compatible with other optical equipment. Erbium-doped fiber lasers in optical communication window wavelength 1550nm band cause people more and more extensive attention.1. Based the Maxwell equations, we calculated the nonlinear Schrodinger equation which governs the optical pulse transmission; And introduced the split-step Fourier method for solving the nonlinear Schrodinger equation.2. To further study the physical mechanism of the soliton pulse, we solved the extended coupled complex nonlinear Schrodinger equations. The input noise pulse gradually evolved into a stable pulse with the interaction between the dispersion and the nonlinear, we theoretically studied the soliton chaotic dynamics mechanics in the passive mode-locked fiber laser by solving the coupled Schrodinger equation; The self-similar pulse was also studied in this way.3. The generation of high energy, wavelength-tuned supercontinuum sources has been investigated numerically. A stable wavelength-tunable soliton source was first obtained by compressing pulse with a parabolic, shape in a dispersion decreasing fiber (DDF). Subsequently, a widely tunable supercontinuum was generated by propagating the resulting soliton in a highly nonlinear silica fiber (HNSF). In order to understand the underlying mechanisms of the SC generation process, we have also investigated the influence of the width, the initial chirps and the pulse shape of the compressed pulse on the generation of the supercontinuum.4. We simulated the generation of the bound soliton and its spectrum was obtained. The bound state of self-similar pulse was obtained in the experiments. Keyword:Fiber Laser High energy ultra-short pulse Dispersion Decreasing Fiber Supercontinuum...