Font Size: a A A

Research On Mode-Locking Fiber Laser And Supercontinuum Sources

Posted on:2015-06-10Degree:DoctorType:Dissertation
Country:ChinaCandidate:W Y LiFull Text:PDF
GTID:1228330467464307Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
Development of high-energy ultra-short pulse fiber laser and the use of this kind of fiber laser for supercontinuum (SC) generation in the photonic crystal fiber (PCF) has been the frontier hot research topic in the field of nonlinear fiber optics. In recent years, a new type of dissipative soliton (DS) mode-locked fiber laser in all-normal-dispersion (ANDi) cavity has attracted a great deal of research enthusiasm. Especially in ytterbium doped fiber laser (YDFL), the DS can be wave-breaking-free transmitted in all-fiber ANDi cavity to achieve high energy. Therefore, based on the DS YDFL study will have broad prospect of application for SC generation.In this thesis, by researching the theory and experiment of the DS YDFL, analyzing its mechanism and the performance parameters, we improved some properties of laser to be suitable for SC generation in the PCF. The main research content is as follows:1. We establish an all-fiber ytterbium-doped mode-locked fiber laser simulation model.The YDFL has been proved by the simulation analysis of the DS molecules, and we first time prove sixth-DSs molecules in YDFL. By useing a bandwidth-tunable filter, YDFL can realize the DS molecules.2. By useing multi-wavelength-tunable filter, we first time realize the triple-wavelengths DS in YDFL based on the semiconductor saturable absorption mirror (SESAM). By tunning bandwidth of the filter, triple-wavelengths DS can easily switch to the dual-wavelengths and, and all can realize wavelength-tunable function. In single-wavelength DS mode-locked YDFL, the wavelength-tunable range is39.7nm.3. Based on broadband LiNbO3modulator, we first time realize the polarization-maintaining (PM) DS in actively mode-locked fiber lasers, the degree of polarization of polarized light as much as98.9%. In the no-PM actively mode-locked fiber laser cavity, the YDFL achieve vector dissipative soliton. By tunning the work frequency of the pulse patten generator (PPG), the wavelength of DS can be tuned from1029.352nm to1079.256nm. The wavelength-tunable range is49.9nm, and wavelength-tunable precision is9.4pm. In addition, we first time observe the dual-pulses DSs in actively mode-locked fiber laser. The mechanisms of this dual-pulses DSs are obviously different from the dual-DSs molecules in passively mode-locked fiber laser.4. We implement the DS actively harmonic mode-locked fiber laser. The harmonic mode-locked order is up to30th, and the repetition frequency is609.844MHz. By tuning the center of the optical pulse wavelength, the fiber laser can be flexibly switchable betwenn gaussian soliton and dissipative soliton mode-locking.5. We design and implement all-fiber, repetition frequency-tunable picosecond pulse SC source.When the repetition frequency is29.8MHz, the average power of SC source is11.8W, the spectrum range of SC is from440nm to1700nm, and the20dB bandwidth of spectrum is1200nm. The visible bands flatness is less than10dB. When the repetition frequency is328.1MHz, the average power of SC source is20.7W, the spectrum range of SC is from500nm to1700nm, and the20dB bandwidth of spectrum is1100nm.
Keywords/Search Tags:dissipative soliton, harmonic modelocking fiber laser, MOPA, supercontinuum
PDF Full Text Request
Related items