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Researcn On All-fiber Uitrasnort Pulse Chirped Amplification System

Posted on:2018-11-19Degree:MasterType:Thesis
Country:ChinaCandidate:S WangFull Text:PDF
GTID:2348330512482143Subject:Electronic and communication engineering
Abstract/Summary:PDF Full Text Request
The first process of CPA,stretchs the femtosecond pulse,and then the widened laser pulse into the amplifier to amplify,and finally compresss the amplified laser pulse,the pulse power and quality of the ultra-short pulse amplification process can be guaranteed.Since 1985,D.Striclland and G Mourou proposed the concept of chirped pulse amplification(CPA),the ultra-short pulse laser technology has made rapid development,and chirped pulse amplification(CPA)becomes the key technology to obtain high power femtosecond laser pulse.All-fiber CPA system has the advantages of good reliability,no need to adjust the light path,small size,light-weight,convenient maintenance and use,and high coupling efficiency,has become a research hotspot in the field of ultra-short pulse laser.This paper focuses on the research of CPA ultra-short pulse amplification system of all-fiber structure,the main work of this paper is as follows:(1)Based on the theory of dispersion and nonlinearity of optical fibers,the model is established from the nonlinear transmission equations,and the propagation evolution of optical pulses in the CPA system is simulated and analyzed by using the distribution of Fourier method.(2)The general EDF and large mode field EDF,DCF+EDF+SMF,CFBG+EDF+CFBQ CFBG+EDF+large mode field EDF+CFBG,several all-fiber chirped amplification system is theoretically analyzed,and comparing to the latter two all-fiber system the study shows that using DCF full-fiber CPA system does not produce better effect,using CFBG system has more obvious advantages of carrying high power pulses to prevent pulse deterioration,while the general EDF and large mode field EDF system uses the dispersion of the gain fiber to realize the CPA,with simple structure and advantages of carrying high power pulses.(3)According to the above research,a new all-fiber CPA system design scheme of CFBG+EDF+large mode field EDF+CFBG is proposed.The simulation results show that the system can obtain more desirable result.
Keywords/Search Tags:Ultra-short pulse, Chirped pulse amplification, Erbium doped fiber amplifier, Dispersion compensation, Chirped volume Bragg grating
PDF Full Text Request
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