Dissertation > Excellent graduate degree dissertation topics show

Investigation of 2μm Tm3+-Doped Double-Clad Fiber Lasers

Author: LiYao
Tutor: YangZhenYu
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: Double-clad fiber laser Thulium-doped fiber Couple system Absorption coefficient Center wavelength FBG
CLC: TN248
Type: Master's thesis
Year: 2011
Downloads: 113
Quote: 0
Read: Download Dissertation

Abstract


Cladding-pumped Thulium-doped double-clad fiber lasers which use the technology of cladding-pump to pump gain fiber can obtain the laser transition between 3F4 and 3H6 at approximately 2μm.The laser near 2μm operates at eye-safe region, and the laser has a great use in industry, medicine and military, it even could be used as the pump source of 3~5μm OPO. Therefore it is valuable to research Tm3+-doped fiber laser operating at 2μm.The research of this paper starts from the energy level structure of Tm3+, then we analyzed the transition of 3H6→3H4 and the process of laser output including a detailed numerical analysis. The forward and backward distributions of pump power and signal power, the dependence of the fiber length and the transmission loss are also numerically modeled. After that we designed the couple system of the laser system.Based on all of these theories, we determine the program of our experiment. We purchased the equipments related to the experiment, including pump sources, aspheric lens, dichroic mirror, etc. We set up the fiber optic test platform and the fiber laser platform. We tested the absorption coefficient of the fiber and determined the best length of fiber through experiment. Finally we realized 7.4W CW output power with central wavelength of 1909nm,the threshold of the system is about 2.5W and the slope efficiency is 35.8%.At last we improved the experimental program that we wrote the FBG at the end of the gain fiber. It is used to increase the effect of the resonator and execute frequency selection.

Related Dissertations

  1. The Association between N-terminal Pro-brain Natriuretic Peptide (NT-proBNP), Fasting Blood Glucose (FBG), Highsensitive C-reactive Protein (HsCRP) and Leptin in Patient with Acute Coronary Syndorme (ACS),R541.4
  2. Study on the Laser Characteristic of Tm3+-doped Double-cladding Fiber,TN248
  3. FBG sensing structure, transfer characteristics and the contact force measurement,TP212.14
  4. FBG -based cable force sensors Development and Application,TU317
  5. Special multi-parameter sensing fiber grating and its application,TP212.14
  6. Blowers dynamic stress monitoring,TH44
  7. Fiber grating fence alarm system and experimental study,TN253
  8. Theoretical and Experimental Study of Pulse Pumped Ytterbium-doped Double-clad Fiber Laser,TN248
  9. The Study of Cable’s Temperature Monitoring Systm Using Distributed Fiber Bragg Grating Based on ARM,TM247
  10. Design of Digital Demodulation System for Fiber Bragg Grating Sensor,TP212.14
  11. Study of Low-frequency FBG Vibration Sensor System,TP212
  12. Research and Implemenlation of Embedded Demodulation System for Fiber Bragg Grating Sensors,TN253
  13. Fabricated of Titled Fiber Bragg Grating and Research on Its Spectrum Transmission Characteristics,TN253
  14. The Correlation between MTHFR, Fibrinogen Gene Polymorphism and Cerebral Infarction,R743.3
  15. Study on Intrinsic Fbg-based Smart Structures,TP212.6
  16. Study of Multiwavelength Fiber Laser and Light Transfer Characteristic Based on Stimulated Brillouin Scattering in Optical Fiber,O437.2
  17. Theoretical Analysis and Application of Special Fiber Bragg Gratings,TN253
  18. Technical Investigation on Preparing Aluminium Matrices Smart Composites by Ultrasonic Welding,TG453.9
  19. Investigation of Rail Axle-Counting Systems Based on Matched Fiber Bragg Gratings,U284.47
  20. The Research of Low-coherence Interferometer Based Distributed Optical Fiber Sensing System,TP212
  21. The Design and Implementation High-speed Fiber Grating Demodulation System Based on SOPC,TN253

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser
© 2012 www.DissertationTopic.Net  Mobile