Analyses of mode filling factor of a laser end-pumped by a LD with high-order transverse modes

Juhong Han; You Wang; Guofei An; Kepeng Rong; Hang Yu; Shunyan Wang; Wei Zhang; He Cai; Liangping Xue; Hongyuan Wang; Jie Zhou

doi:10.1117/12.2268121

12 May 2017 Analyses of mode filling factor of a laser end-pumped by a LD with high-order transverse modes

Juhong Han, You Wang, Guofei An, Kepeng Rong, Hang Yu, Shunyan Wang, Wei Zhang, He Cai, Liangping Xue, Hongyuan Wang, Jie Zhou

Author Affiliations +

Proceedings Volume 10173, Fourth International Symposium on Laser Interaction with Matter; 101731I (2017) https://doi.org/10.1117/12.2268121
Event: 4th International Symposium on Laser Interaction with Matter, 2016, Chengdu, China

Abstract

Although the concept of the mode filling factor (also named as “mode-matching efficiency”) has been well discussed decades before, the concept of so-called overlap coefficient is often confused by the laser technicians because there are several different formulae for various engineering purposes. Furthermore, the LD-pumped configurations have become the mainstream of solid-state lasers since their compact size, high optical-to-optical efficiency, low heat generation, etc. As the beam quality of LDs are usually very unsatisfactory, it is necessary to investigate how the mode filling factor of a laser system is affected by a high-powered LD pump source. In this paper, theoretical analyses of an end-pumped laser are carried out based on the normalized overlap coefficient formalism. The study provides a convenient tool to describe the intrinsically complex issue of mode interaction corresponding to a laser and an end-pumped source. The mode filling factor has been studied for many cases in which the pump mode and the laser mode have been considered together in the calculation based on analyses of the rate equations. The results should be applied for analyses of any other types of lasers with the similar optical geometry.

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Juhong Han, You Wang, Guofei An, Kepeng Rong, Hang Yu, Shunyan Wang, Wei Zhang, He Cai, Liangping Xue, Hongyuan Wang, and Jie Zhou "Analyses of mode filling factor of a laser end-pumped by a LD with high-order transverse modes", Proc. SPIE 10173, Fourth International Symposium on Laser Interaction with Matter, 101731I (12 May 2017); https://doi.org/10.1117/12.2268121

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KEYWORDS

Transmission electron microscopy

Laser systems engineering

Solid state lasers

Diode pumped solid state lasers

Analytical research

Laser optics

Modes of laser operation

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