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Research On Characteristic Of Fiber Amplifier At2μm Band

Posted on:2016-09-01Degree:MasterType:Thesis
Country:ChinaCandidate:Z YinFull Text:PDF
GTID:2298330467472477Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
The fiber laser have attracted much attention due to their many advantages, including high efficiency, excellent beam quality and good heat dissipation. The spectrum of thulium-doped fiber laser is tunable range, the2μm band can be widely used in laser medicine, remote sensing at close range in the security zone of the human eye, military and other fields. The fiber amplifiers due to their high transmission power and small core cross section, easily produced stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS) and other nonlinear effects. Some specific domains, such as the nonlinear frequency conversion needs single-frequency amplifier, the output characteristics of2μm band single-frequency Raman fiber amplifier (SF-RFA) can be affected such as pump power, fiber length and signal light seeds power, the output power of SF-RFA is limited by SBS effect.This paper studies the theory and output characteristics of2μm band SF-RFA, for which the numerical simulation of the SBS effect, and single wavelength linear cavity thulium-doped fiber lasers and amplifiers are studied experimentally, the main contents are as follows:(1) Research on basic theory of SF-RFA. Mainly from basic principles of the Raman fiber amplifier, the Raman fiber amplifier characteristics, the Raman fiber amplifier classification and the SBS effect of SF-RFA in theoretical research.(2) Quantitative analysis of the factors affecting the output characteristics of2μm band SF-RFA. The nonlinear model considering the SBS effect was established, using the Runge-Kutta method and the Newton iteration method for solving power and distribution characteristics of laser and Stokes in model. Use of Matlab in simulation, systematic analysis of the impact of pump power, fiber length, signal light seeds power and other factors on output characteristics of2μm band SF-RFA. Simulation results show that the higher pump power, the greater output power of amplifier and SBS power, to prevent excessive SBS power influence on the performance of amplifier, you should avoid using excessive pumping power. Within the pump power100W, the longer fiber corresponds to a higher output power, SBS power and conversion efficiency of amplifier. Appropriate to increase signal light seeds power can be effectively increased the output power and conversion efficiency of amplifier, while SBS power can be reduced.(3) Set up the experiment system of single wavelength linear cavity thulium-doped fiber lasers and amplifiers. Experiment measured center wavelength of all fiber thulium-doped laser seeds light is1941.4nm, the signal to noise ratio is54dB. And continuous detection of the laser over100minutes, the measured center wavelength shift of the laser is less than0.01nm, peak power jitter of the laser is less than0.7dB. As the pump power of thulium-doped amplifiers reached2.15W, the output power of the laser can be reached0.778W.
Keywords/Search Tags:2μm, RFA, SRS, SBS, Thulium-doped fiber laser
PDF Full Text Request
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