Study of thermal lensing in a side diode pumped Nd:YAG laser by using boundary element method

Author

Sovizi, M. ; Massudi, R.

Author_Institution

Laser & Plasma Res. Inst., Shahid Beheshti Univ., Tehran

fYear

2005

fDate

15-17 Sept. 2005

Firstpage

147

Lastpage

151

Abstract

Boundary Element Method (BEM) is used to study transversely diode pumped Nd:YAG laser that is pumped by three laser diode arrays. At first, energy distribution of the pumping beams is calculated by propagating a Gaussian beam in radial direction inside the rod. Then, by using BEM, stationary heat transfer equation is solved numerically and temperature distribution and refractive index of the laser rod are calculated. Having refractive index of the rod, we solve equation of path of the ray along the laser rod and obtain phase of transmitted beam from the laser rod. The resulting wavefront is fitted with a sphere and equivalent focal distance of the laser rod is calculated by this method. The results are compared with those obtained by Finite Difference Method and good agreements between them are observed

Keywords

boundary-elements methods; finite difference methods; heat transfer; laser beams; neodymium; optical pumping; refractive index; solid lasers; temperature distribution; thermal lensing; BEM; Gaussian beam; YAG:Nd; YAl5O12:Nd; boundary element method; diode pumped Nd:YAG laser; energy distribution; equivalent focal distance; finite difference method; laser diode array; laser rod; pumping beams; refractive index; stationary heat transfer equation; temperature distribution; thermal lensing; Boundary element methods; Diode lasers; Equations; Laser beams; Laser excitation; Optical arrays; Pump lasers; Refractive index; Semiconductor laser arrays; Thermal lensing;

fLanguage

English

Publisher

ieee

Conference_Titel

Laser and Fiber-Optical Networks Modeling, 2005. Proceedings of LFNM 2005. 7th International Conference on

Conference_Location

Yalta, Crimea

Print_ISBN

0-7803-9147-0

Type

conf

DOI

10.1109/LFNM.2005.1553214

Filename

1553214