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Study On Thulium-doped Fiber Amplifier For Dual Single-frequency Laser Amplification Characteristics Based On Stimulated Brillouin Scattering

Posted on:2017-01-06Degree:MasterType:Thesis
Country:ChinaCandidate:D ZhaoFull Text:PDF
GTID:2308330482479402Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
2 μm laser is widely used in laser medicine, biology, laser LIDAR, remote sensing and military because it can operate in the eye-safe spectrum range and wide tunable range. In order to improve the beam quality of the laser output light, high-power fiber lasers are used in the structure of the master oscillator power amplifier (MOPA). However, in the ordinary narrow linewidth fiber amplifier, since the high power transmission, small sectional area of the core, and long interaction distance, leading to various nonlinear effects are prone, especially stimulated brillouin scattering (SBS) Effects, the SBS leads to the laser output power reduced. In this paper, the characteristics of thulium-doped fiber amplifier (TDFA) for dual single-frequency and dual single-frequency amplification is studied. This paper provides theoretical references for designing high power MOPA laser system. The main work and innovations of this paper include:1. The theoretical model of TDFA for dual single-frequency amplification based on the SBS effect is established. Using the Runge-Kutta method combined with Newton iterative method to solve the theoretical model.2. The above modelis simulated by Matlab software. Pump power, signal power, stokes power and temperature of energy distribution along the length of the fiber are obtained by TDFA model. And the performance between dual single-frequency amplification and single-frequency amplification are compared. Under the same conditions, when the two signal seeds power ratio of 1:1, the signal output power of dual single-frequency amplification is about twice the single-frequency amplification, the SBS threshold power of dual single-frequency amplification is twice the single frequency amplification.3. When the two seeds center wavelength of 1941 nm and 1940 nm, respectively, the signal power of 1 W, the pump power for 60 W, the signal output power can be obtained which is 25.75 W with the fiber length of 28 m. By appropriately increasing the fiber length, increasing the Tm3+ ion concentration, increasing the pump power and the effective area of gain fiber core, can effectively improve the output power of the TDFA and suppress the SBS effect of the dual single-frequency amplification.
Keywords/Search Tags:Fiber amplifier, thulium-doped fiber amplifier, dual single-frequency amplification, Stimulated Brillouin Scattering
PDF Full Text Request
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