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Research On Performance Improvement Of High-Energy Dissipative Soliton Mode-Locked Fiber Laser

Posted on:2015-04-28Degree:MasterType:Thesis
Country:ChinaCandidate:H ChiFull Text:PDF
GTID:2348330485993837Subject:Optical engineering
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With the development of science and technology, the advantages of high pulse energy femtosecond pulses make mode-locked fiber lasers desirable for a variety of commercial and scientific applications. Although high pulse energy and high average power can be achieved by traditional large mode area micro-structured fiber lasers, compactness and stability is obviously the disadvantages of this kind of lasers. Therefore, this paper proposes a compact single-mode double-clad high-energy mode-locked fiber laser. Through the theoretical analysis of dissipative soliton pulse shaping mechanism, we propose an optimization method for improving performances of dissipative soliton mode-locked laser. The method is proved successfully both in simulation and experiment, achieving a dozens of nanojoule pulse energy mode-locked fiber laser. This thesis work can be summarized as the following sections.1. The first part shows a brief description of the development of mode-locked fiber lasers, describing a variety of physical processes in pulse mode-locked fiber lasers involved in the process of evolution and numerical methods.2. Details of the dissipative soliton pulse shaping mechanism and the mechanism of pulse evolution of equilibrium theory. Based on the balance between normal dispersion and nonlinear phase shift, we propose a method of analysis named AB-ratio, which is based on the distribution of the passive fiber to optimizing the accumulation of nonlinear phase shift. The method is proved in the numerical simulation and the result shows that the high pulse energy, high peak power pulses can be achieved.3. Based on the simulation results presented in Part 2, we sets up a dissipative soliton mode-locked fiber laser which successfully obtains a high average power, high pulse energy and peak power results, which are 3-W average power, 81-MHz of the repetition rate, and the pulse energy is 37 n J with 66-fs dechirped pulse duration. The experiment results highly consistent with the simulation results.4. In part 3, due to the dechirped pulse having a larger pedestal, a vector dispersion compensation device using an adjustable ratio between second-order dispersion and third-order dispersion is introduced. The high compression efficiency device guarantees the compensation of pulse pedestal and high peak power of 350 k W.5. Finally, the impact of different length of passive fiber while maintaining the AB-ratio to laser performances and the impact of different filter bandwidth to laser performances are discussed. The numerical simulation results predict that the laser cavity which has the 1-m SMF-B, 1.8-m gain fiber length and 25-nm spectral filter can get 133-n J pulse energy of, less than 50-fs dechirped pulse duration high energy ultrafast pulses.
Keywords/Search Tags:fiber laser, mode-locked, femtosecond pulses, high energy, dissipative soliton
PDF Full Text Request
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