محاكاة الحل التحليلي لقدرة خرج ليزر ليف زجاج السليكا المطعم باليتاربيوم
Author name:
كنار نبيل جليل
Supervisor name:
مظهر شهاب احمد
General topic:
Physics
Specific topic:
Laser Physics and Electro-optics
Degree:
Master
University:
University of Baghdad - Ibn Al-Haytham College Of Education For Pure Sciences - Physics Department
Language:
English
University location:
Baghdad
First pages:
26T1910 - p.pdf
Abstract:
The current study included treating a theory of general derivation equation coefficients output laser's power ( ) by using the analytical solution of the rate equations that included the transition factor ( ), in which the losses scattering be neglected for a laser system when the active material is an optical fiber, its core is silica glass and Yb3+ - doped.While its resonant cavity it resonator Fabry - Perot, and it is pumping through one end of the optical fiber, while the Continuous Wave (CW) laser emission from the other end.In this study, it has been selected pumping wavelength ( 920*10 - 9m) and lasing wavelength ( 1090*10 - 9m) for this middle effective as an example of a typical plan to pump quasi four levels to find a numerical solution of the equation of the output laser which have been derived by programmable coefficients of this equation matlab language (version 8.1) this happened, after the coefficient ( ) has been calculated for all these laser transitions of this middle effective when it has been pumped ( ) as mention above.The simulation results for this laser system have presented that since the optical fiber is Single Clad Fiber (SCF) and a design of (Lycom ) type, it has been found that the concentration of the type (CorActive) is the highest value for obtaining high efficiency.The laser output power ( ) has been drops linearly by the increasing of core optical fiber radius, while it increases linearly with the increasing of the length of optical fiber, the laser output mirror reflectivity, pumping power, it is the highest values when using the optical fiber Single Mode (SM).In case of the optical fiber is Double Clad Fiber (DCF) and the design of type Large Mode Area (LMA), the ( ) decreases with increasing radius of the core of the optical fiber, while increases with each of the length of optical fiber and pumping power.In addition to that it has been found that ( ) increases linearly with the increasing pumping power whether the inner clad fiber shape is a Rectangle or Square or Circular, and that, the value of laser output power and efficiency are higher in the case of a Rectangular shape.
