Extraordinary variation of pump light intensity inside a four-level solid-state laser medium |
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Authors: | Hua Qin Rulian Fu Zhaoqi Wang Juan Liu |
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Institution: | aDepartment of Physics and Photoelectricity Information Technology, Shandong University of Technology, 12 Zhangzhou Road, Zhangdian District, Zibo 255049, China;bInstitute of Modern Optics, Nankai University, Tianjin 300071, China |
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Abstract: | A theoretical investigation of the absorption of the pump light at different intensities through a four-level solid-state laser medium is presented. It is found that the variation of the pump intensity inside the laser medium cannot always simply be dominated by Beer's law. Transmission of the pump light through this laser medium is closely related to the pump intensity itself. In fact, when the pump intensity is relatively low, whose values depend on the characteristics of the medium, the variation of the pump light through the laser medium is consistent with Beer's law. However, while the pump intensity is high enough, the relationship between the transmission of the pump light and its propagation distance is demonstrated to be linear. These theoretical results have been confirmed by the experiment with a medium of YAG:Nd. |
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Keywords: | Laser medium Rate equations Photon transport equation Pump light variation |
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