Analytical model for thermal lensing and spherical aberration in diode side-pumped Nd：YAG laser rod having Gaussian pump profile

• Published in: Chinese physics B Vol. 24; no. 12; pp. 334 - 341
• Main Authors: Moghtader Dindarlu, M H, Kavosh Tehrani, M, Saghafifar, H, Maleki, A
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.12.2015
• Subjects: Aberration; Diodes; Gaussian; Gaussian pump profile; Lasers; Mathematical analysis; Mathematical models; Physical properties; Pumps; side-pumped laser rod; spherical aberration; thermal effects; thermal lens; YAG激光棒; 二极管侧面泵浦; 像差分析; 模型; 热透镜; 球面像差; 高斯
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/24/12/124205

In this paper, according to the temperature and strain distribution obtained by considering the Gaussian pump profile and dependence of physical properties on temperature, we derive an analytical model for refractive index variations of the diode side-pumped Nd：YAG laser rod. Then we evaluate this model by numerical solution and our maximum relative errors are 5% and 10% for variations caused by thermo–optical and thermo–mechanical effects; respectively. Finally, we present an analytical model for calculating the focal length of the thermal lens and spherical aberration. This model is evaluated by experimental results.