15 February 2012 Comparison between two active media Nd: YAG and Nd: YVO4 rods inside a cavity for producing a high-power 808nm diode end-pumping laser system
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Abstract
Diode end-pumped solid-state lasers have the potential to yield high quality laser beams with high efficiency and reliability. This paper presents a comparison between high-efficiency Nd: YVO4 and Nd: YAG laser rods in the 20W diode end-pumped laser systems. Comparison done by using a special finite element analysis software program (professional LasCad version 3.6.1) for characterizing the all effective parameters inside the cavity like; optimized rod length, optimized rod diameter, beam waist spot size, optimized resonator length. Theoretical modeling of the absorbed power density for end pumped rods is studied. Stability and analyzed temperature distributions, temperature effects on the solid state crystal (thermal fracture) and thermal lensing effects in 3-D numerical model are investigated. It is important to simulate the temperature gradient on the front face and inside the pumped Nd: YAG and Nd: YVO4 crystal to avoid thermally induced fracture and evaluates the maximum pumped power. This paper shows that Nd: YVO4 laser system has higher optical efficiency of 40% than that of Nd: YAG laser system with optical efficiency of 25%, and the optimized output powers for Nd: YVO4 and Nd: YAG of 8.63 W and 5.4 W, respectively for same parametric study like; rod length of 6 mm, rod diameter of 2 mm, beam waist of 150 μm and resonator length of 56.16 mm.
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Ashraf F. El-Sherif, Ashraf F. El-Sherif, Khalid Hussein, Khalid Hussein, Mahmoud F. Hassan, Mahmoud F. Hassan, Mahmoud M. Talat, Mahmoud M. Talat, } "Comparison between two active media Nd: YAG and Nd: YVO4 rods inside a cavity for producing a high-power 808nm diode end-pumping laser system", Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 82351P (15 February 2012); doi: 10.1117/12.902906; https://doi.org/10.1117/12.902906
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