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Er3+/yb3+ Codoped Double-clad Fiber Cavity Laser

Posted on:2011-09-25Degree:MasterType:Thesis
Country:ChinaCandidate:F RenFull Text:PDF
GTID:2198330338983535Subject:Photonics technology
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With the development of cladding pump technology, pulse peak power and single pulse energy in fiber lasers have been improved greatly. Not only double-clad fiber lasers can maintain the laser small size and compact structures, but also they can use inexpensive multi-mode high power LD as pump source. So achieving high power laser output through double-clad fiber laser becomes the best choice. In recent years, the study on double-clad fiber lasers using nonlinear polarization rotation theory has been increasingly and widely attracting lots of researchers and scientists'interests owing to their advantageous properties. Based on the experiment condition and research plan, this paper work was focused on experimental and theoretical study on Er3+/Yb3+ codoped double-clad fiber cavity laser. The contents of this thesis are as follows:1. The theoretical research of passively mode-locked Er3+/Yb3+ codoped double-clad fiber cavity laser based on nonlinear polarization rotation effectWe studied theoretically lasing of Er3+/Yb3+ codoped fiber laser through relevant equations. At the same time based on the nonlinear GinZburg-Landau equations, passively mode-locked mechanism exploiting nonlinear polarization rotation effect was demonstrated.2. The theoretical study of Er3+/Yb3+ codoped double-clad fiber cavity laser on the basis of Semiconductor Saturable Absorber effectWe demonstrated theoretically main two steps of passively mode-locked pulses Semiconductor Saturable Absorber Mirror achieves: self-start and stable mode-locking stages.3. The experimental research of Er3+/Yb3+ codoped double-clad fiber cavity laserAll fiber ring laser with a small segment of Er3+/Yb3+ codoped double-clad fiber as gain medium, pumped by a stable 976nm high power laser diode, was experimentally demonstrated. Using mode-locked mechanism by the nonlinear polarization rotation technique ,adjusting the polarization controllers orientations and pump, the stable operations of passive Q-switch ed,Q-switched-mode-locked,continual mode-locked and high-order harmonically mode-locked regime were obtained experimentally. The repetition rate of Q-switched pulses is from 7.583 to 32.86KHz, the repetition rate of continual mode-locked pulses is 8.843MHz, the repetition rate of the second harmonically mode-locked pulses is 17.49MHz and the repetition rate of the third harmonically mode-locked pulses is 24.22MHz.
Keywords/Search Tags:Fiber laser, Cavity, Er3+/Yb3+ codoped fiber, Double-cladding, Semiconductor Saturable Absorber Mirror, Passive mode-locking, Q–Switching, Harmonica mode-locking
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