Modeling the pulse shape of Q-switched lasers to account for terminal-level relaxation |
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| Authors: | Zeng Qin-Yong Wan Yong Xiong Ji-Chuan and Zhu Da-Yong |
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| Affiliation: | School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China; Southwest Institute of Technical Physics, Chengdu 610041, China |
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| Abstract: | To account for the effect of lower-level relaxation, we have derived a characteristic equation for describing the laser pulse from the modified rate equations for Q-switched lasers. The pulse temporal profile is related to the ratio of the lower-level lifetime to the cavity lifetime and the number of times the population inversion density is above the threshold. By solving the coupled rate equations numerically, the effect of terminal-level lifetime on pulse temporal behaviour is analysed. The mode is applied to the case of a diode-pumped Nd:YAG laser that is passively Q-switched by a Cr4+:YAG absorber. Theoretical results show good agreement with the experiments. |
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| Keywords: | solid state laser passive Q-switch Cr4+:YAG absorber |
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