| ATOMIC AND MOLECULAR PHYSICS |
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Simulation of Intermediate State Absorption Enhancement in Rare-Earth Ions by Polarization Modulated Femtosecond Laser Field |
| Wen-Jing Cheng**, Shi-Hua Zhao |
School of Electrical & Electronic Information, Shangqiu Normal University, Shangqiu 476000
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| Cite this article: |
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Wen-Jing Cheng, Shi-Hua Zhao 2018 Chin. Phys. Lett. 35 113201 |
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Abstract We extend the third perturbation theory to study the polarization control behavior of the intermediate state absorption in Nd$^{3+}$ ions. The results show that coherent interference can occur between the single-photon and three-photon excitation pathways, and depends on the central frequency of the femtosecond laser field. Moreover, single-photon and three-photon absorptions have different polarization control efficiencies, and the relative weight of three-photon absorption in the whole excitation processes can increase with increasing the laser intensity. Therefore, the enhancement or suppression of the intermediate state absorption can be realized and manipulated by properly designing the intensity and central frequency of the polarization modulated femtosecond laser field. This research can not only enrich theoretical research methods for the up-conversion luminescence manipulation of rare-earth ions, but also can provide a clear physical picture for understanding and controlling multi-photon absorption in a multiple energy level system.
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Received: 14 August 2018
Published: 23 October 2018
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| PACS: |
32.80.Qk
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(Coherent control of atomic interactions with photons)
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32.80.Wr
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(Other multiphoton processes)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51132004, 11474096, 11604199, U1704145 and 11747101, the Science and Technology Commission of Shanghai Municipality under Grant No 14JC1401500, the Henan Provincial Natural Science Foundation of China under Grant No 182102210117, and the Higher Education Key Program of He'nan Province of China under Grant Nos 17A140025 and 16A140030. |
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