Keshavarz, Kazempour,
Volume 6, Issue 2 (10-2012)
Abstract
The ABCD matrix method is used to simplifying the theoretical coupling efficiency calculation of Elegant Hermite-Cosh-Gaussian (EHChG) laser beams to a Single Mode Fiber (SMF) with a quadric lens formed on the tip. The integrals of coupling efficiency relation are calculated numerically by Boole method. Meanwhile, the structure parameters of surface-lensed fiber are optimized in numerical simulation to achieve maximum coupling efficiency. Results can give some guidance suggestions for designing suitable micro lenses in order to coupling the EHChG laser beams to the SMF.
Dr. Mahdi Shayganmanesh, Dr. Davood Razzaghi, Ms. Maryam Goli Hasanlo, Ms. Arezou Jalilzadeh Heydarlou, Dr. Marzieh Akbari, Dr. Mohammad Reza Moghaddam,
Volume 18, Issue 1 (10-2024)
Abstract
In this paper, the thick thermal lens approximation is evaluated for a CTH:YAG laser with a standard telescopic resonator. An accurate relation between the thermal lensing parameter and lens-like media factor is proposed. Telescope adjustments were studied based on the practical values of the focal length of the thermal lens. The fundamental mode volume is determined regarding the Hermit-Gaussian theory, and the influence of the defocus parameter is examined. The study emphasizes the importance of considering both the fundamental mode volume and the distance to the stability boundary when selecting the optimal defocusing parameter. A merit factor was introduced that provides a comprehensive approach to selecting the most suitable defocus parameter for the system.
