Influence of magnification on extraction efficiency in laser resonators with non-overlapping beams

23rd Congress of the International Commission for Optics

González, M.G.^1,3 ; Peuriot, A.L.^2 ; Garea, M.T.^1 ; Santiago, G.D.^1

Grupo de Láser, Óptica de Materiales y Aplicaciones Electromagnéticas (GLOMAE), Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, Buenos Aires

(1063), Argentina^1

Centro de Investigaciones en Láseres y Aplicaciones, CITEDEF, Juan Bautista de Lasalle 4393, Buenos Aires

(1603), Argentina^2

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C.A.B.A., Av. Rivadavia 1917, Argentina^3

关键词: Beam pattern;    Counter propagation;    Extraction efficiencies;    Fresnel number;    Mode profiles;    Optimal operation;    TEA CO2 laser;    Unstable resonators;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/605/1/012019/pdf
DOI  :  10.1088/1742-6596/605/1/012019

来源: IOP

【 摘 要 】

The magnification and the Fresnel number determine the mode profile and losses in a bare unstable resonator. Upon inclusion of gain, both the beam pattern and the reflectivity are changed, more than in a stable cavity, because the counter-propagation intensities differ spatially and saturate the amplifier in a way that alters the mode profile, the reflectivity and the conditions of optimal operation. In this paper we present a numerical study of two types of cavities and compute the mode profile and losses in presence of an amplifier that saturates homogeneously. We compare these results with experimental data obtained on a TEA CO2laser.