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**
1 Research and Development Center for Functional Crystals, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001902 Collaborative Innovation Center of Quantum Matter, Beijing 100190
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.
收稿日期: 2016-04-08
出版日期: 2016-10-27
:
42.65.Jx
(Beam trapping, self-focusing and defocusing; self-phase modulation)
42.70.Nq
(Other nonlinear optical materials; photorefractive and semiconductor materials)
78.20.Ci
(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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2016, Vol. 33 
