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Research On High Peak Power Ultrashort Pulse Generation And Amplification System

Posted on:2019-07-03Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y WangFull Text:PDF
GTID:2348330542487547Subject:Communication and Information System
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With the application of ultrashort pulse in various fields,people have higher and higher requirements on the peak power and pulse width of ultrashort pulse,so the study on the generation and amplification technology of ultrashort pulse has far-reaching scientific significance and practical value,also has attracted much attention at home and abroad.At the same time,self-similar pulse has attracted more and more attention with its unique transmission characteristics.This parabolic-shaped pulse can resist the splitting of light waves well,and its strict linear chirp makes it easy to compress and obtain ultra-short pulse with higher peak power.In addition,the evolution of the self-similar pulse only depends on the energy of the initial pulse and the parameters of the optical fiber.There is no loss of energy during the transmission,and the energy of the initial pulse will all be transformed into the self-similar pulse.In this thesis,we mainly focus on the study of self-similar mode-locked fiber laser and self-similar pulse amplification,the specific contents are as follows.(1)By using the theory of dispersion and nonlinearity of optical fiber,the nonlinear Schrodinger equation was numerically solved by the step-by-step Fourier method.The mathematical models of self-similar mode-locked fiber laser and self-similar pulse amplification were established and analyzed theoretically.It provides a theoretical basis for further research.(2)The characteristics of soliton mode-locked fiber laser and dispersion-managed soliton mode-locked fiber laser were compared.The self-similar mode-locked fiber laser was simulated and a stable laser pulse output was obtained by using the saturable absorber(SA)to achieve mode-locking,using the dispersion compensating fiber(DCF)and single mode fiber(SMF)to provide normal dispersion,using Erbium-doped fiber(EDF)as the gain fiber.(3)The theoretical model of self-similar pulse amplification was established,and the peak power,pulse width,the shape of initial pulse,Raman gain and fiber length were simulated by keeping the other parameters unchanged and adjusting only one parameter variation.The influence of these parameters on the evolution of self-similar pulse was also analyzed.(4)The self-similar pulse evolution was used in the pulse amplification and compression system.Four kinds of extra-cavity pulse amplification and compression schemes were designed by the combinations of different optical fiber,and each scheme separately carried out by two kinds of compression methods of non-optical fiber dispersion compensation and all-optical system compression.The final peak power and pulse width of the four schemes and their respective characteristics were analyzed.
Keywords/Search Tags:ultrashort pulse, optical fiber laser, optical fiber amplifier, self-similar amplification, Raman amplification
PDF Full Text Request
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