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The effect of cladding geometry on the absorption efficiency of double-clad fiber lasers

Javadimanesh M., Ghavami S. S., Khorsandi A.

Optica Applicata

2016

Vol. 46, nr 2

277--289

In the present work, the inner cladding geometries of a typical double-clad fiber laser are studied and numerically simulated for different cladding shapes to obtain the maximum absorption efficiency for the pump beam. This is performed by using the ray tracing approach and dislocating the fiber core from the center to impose the asymmetry on the investigated geometries. The high absorption efficiency of ~94.5% was obtained for the optimized offset D-shaped double-clad fiber. The hexagonal shape is proposed as a new geometry for the inner cladding to attain higher absorption efficiency. It was found that the absorption efficiency of ~68% for a symmetrical hexagonal can be improved to ~95% for an asymmetrized hexagonal-shaped double-clad fiber laser. Eventually the genetic algorithm was used to enhance the performance of the investigated geometries. This resulted in the further increasing of pump beam absorption efficiency of 99.5% in the genetic algorithm optimized asymmetrized hexagonal shape.

Description of a ray trace algorithm for the evaluation of pump power absorption in double-clad fibers

Narro-Garcia R., Rodriguez E., Ponce L., De Posada E., Flores T., Arronte M.

Optica Applicata

2012

Vol. 42, nr 3

571-585

An algorithm for the analysis of the double-clad fiber design is presented. The algorithm developed in the MATLAB computing language, is based on ray tracing method applied to three-dimensional graphics figures which are composed of a set of planes. The algorithm can evaluate an arbitrarily large number of ray paths calculating the corresponding pump absorption in each of the fiber elements according to the Lambert-Beer law. The beam path is evaluated in three dimensions considering the losses by reflection and refraction both at the fiber faces and within the fiber. Due to its flexibility, the algorithm can be used to study the ray propagation in double-clad fiber with: i) variable geometries of the inner clad and the core; ii) different position of the core inside the inner clad; and iii) bending and tapper effects.

Rare-earth-doped high-power fiber lasers generating in near infrared range

Świderski J., Zając A., Skórczakowski M., Jankiewicz Z., Konieczny P.

Opto-Electronics Review

2004

Vol. 12, No. 2

169-173

n this paper, high power double-clad fibre lasers are presented. We have built twoexperimental laser set-ups based on neodymium- and ytterbium-doped active media. A Yb³⁺-silica fiber laser has been cladding pumped at 937 nm by a InGaAs semiconductor laser diode and generated 4 W cw output power with slope efficiency of 73 ± 3%. However, Nd³⁺-doped fiber laser generated over 10 W cw output power with a slope efficiency of 63%. As a result of the experiment, we have elaborated very efficient coherent sources of laser radiation that can be used in many industrial applications.