| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Observation of Two-Photon Absorption and Nonlinear Refraction in AlN |
| Meng Zhao1, Chun-Hua Xu1, Wei-Jie Hu1, Wen-Jun Wang1**, Li-Wei Guo1**, Xiao-Long Chen1,2** |
1Research and Development Center for Functional Crystals, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Collaborative Innovation Center of Quantum Matter, Beijing 100190
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| Cite this article: |
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Meng Zhao, Chun-Hua Xu, Wei-Jie Hu et al 2016 Chin. Phys. Lett. 33 104201 |
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Abstract Two-photon absorption (TPA) and nonlinear refraction in AlN single crystals are revealed with the single beam $Z$-scan technique. A large TPA coefficient of 13$\pm$3 cm/GW at 355 nm and third-order nonlinear refractive indices of $-$1.91$\pm$0.38 $\times$ 10$^{-13}$ cm$^{2}$/W at 355 nm, 1.79$\pm$0.36 $\times$ 10$^{-13}$ cm$^{2}$/W at 532 nm and 1.61$\pm$0.32 $\times$ 10$^{-12}$ cm$^{2}$/W at 1064 nm are derived. It is inferred that the TPA-generated free carriers are responsible for the large negative nonlinear refractive index at 355 nm, while the oxygen impurity induced bandgap narrowing may account for the large third-order nonlinear refractive indices at 532 nm and 1064 nm. The large nonlinear optical responses of AlN promise wide applications in the deep ultraviolet nonlinear optical devices.
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Received: 08 April 2016
Published: 27 October 2016
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| PACS: |
42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51372267, 51210105026 and 51172270, and the National Basic Research Program of China under Grant No 2013CB932901. |
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