Dissertation > Excellent graduate degree dissertation topics show

Double Cladding Ytterbium-doped Fiber Pulse Amplifier

Author: ShenYing
Tutor: WeiHuai
School: Beijing Jiaotong University
Course: Communication and Information System
Keywords: Ytterbium-doped Large Mode Area Fiber Bend Loss Nonlinear Effect Pulse Amplifier
CLC: TN253
Type: Master's thesis
Year: 2012
Downloads: 94
Quote: 0
Read: Download Dissertation


Fiber lasers and amplifiers have become the development focus of laser field because of their advantages of absolutely ideal beam quality, high conversion efficiency, completely exempting the maintenance, high stability, small size and so on. Pulse lasers can achieve the aims which the general laser techniques or tools can not complete. A number of significant discoveries and important research achievements have been produced in the information, energy, environment, medical science, defense and basic science research fields. The major duty of this thesis is high power pulse fiber laser amplifier made of large mode area ytterbium-doped fibers. Devote to construct an all-fiber pulse power amplified system which could generate pulses with high peak power and high energy.This paper analyzes the mechanism of ytterbium doped fiber amplifiers, including the absorption and emission characteristics of ytterbium ions, the transmission equation of pulses in optical fibers, the nonlinear effects in fibers, and the stimulated Raman scattering effects are discussed especially.Pulse lasers need to support higher peak power, so in order to improve the power margin of fibers, some large mode area fibers used in high power fiber amplifiers are studied. The signal quality in fiber core depends on the details of fiber structure with the refractive index profile, doped concentration and shape of cladding. By simulation to bending loss to various kinds of modes with several common refractive index profile, the result shows that compared with the fundamental mode, the bending loss of high order modes can be much larger by bending the fibers at a suitable bend radius, thereby the single-mode transmission can be achieved.The concrete structure of a multistage ytterbium-doped fiber pulse amplifier is designed. Mid-amplifier and post-amplifier are composed with large mode area fibers to decrease the optical power density in the core effectively, so that nonlinear effects can be avoided. Causes of nonlinear effects and methods of how to overcome them are researched. And system performance is simulated with the pulse width of1ns-10ns and pulse repetition frequency of10kHz-100kHz.

Related Dissertations

  1. Theoretical and Experimental Study of Ytterbium-doped Double-clad Fiber Laser,TN248
  2. High-power all-fiber doped with Yb ~ (3) transmission amplification characteristics of optical fiber amplifier,TN253
  3. Yb~(3+)-doped Figure-of-eight Fiber Ultrashort Laser,TN248
  4. Theoretical and experimental study of Yb-doped double-clad fiber lasers,TN248
  5. Yb: YAG crystal growth and laser performance,TN244
  6. Two-photon autocorrelation picosecond pulse detection,TN249
  7. Research on Light Intensity-Modulated Fiber Optic Hydroacoustic Detector,TN256
  8. Experimental Research on Ytterbium-Doped Double-Cladding Fiber Laser and Design for Disc Fiber Laser,TN248
  9. Doped Yb ~ (3) \,TN248
  10. Researches on the Technique of Pulse Fiber Laser and Amplifier,TN248
  11. Theoretical and Experimental Study on the Key Techniques of Main Amplifier in High Power Master-Oscillator Power-Amplifier Fiber Laser Source,TN248
  12. Optical parametric chirped pulse amplification system key technology research,TN24
  13. Design and Implementation of New Laser Materials for Large-mode-area Fiber,TN244
  14. Research on Dispersion Properties and Ultrashort Laser Pulses Propagating in Microstructure Fibers,TN25
  15. Study on the Properties of the Harmonic Generation and the Propagation of High Power Laser in the Final Optical System,TN241
  16. Key issues in high power fiber lasers and amplifiers,TN248
  17. Fabrication and Analysis of the Ytterbium-doped Double-clad Micro-structured Optical Fiber,TN253
  18. The Interaction of Electro-optic and Nonlinear Optic Effects in Dielectric Superlattice,O437
  19. Study on Ultra-short Pulse Yb-doped Fiber Laser and Amplifier,TN722
  20. Theory and Control of High Directivity Audio Sound Wave,O422

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
© 2012 www.DissertationTopic.Net  Mobile