Three-Photon Absorption in Zno Film Using Ultra Short Pulse Laser

• 作者: Abdulla M. Suhail Mohammed T. Hussein Raied K. Jamal
• 来源期刊: 现代物理(英文)
• 学科: 物理学
• 关键词: MULTIPHOTON PROCESSES ZnO NANOCRYSTALLINE NONLINEAR OPTICS
• 年，卷（期）: 2012,（8）
• 页码范围: 856-864
• 页数: 9页
• 分类号: O43

摘要

The three-photon absorption (3PA) in nanostructure wide-band gap ZnO semiconductor material is observed under high intensity femtosecond Titanium-Sapphire laser of 800 nm wavelength excitation. The ZnO film was prepared by chemical spray pyrolysis technique with substrate temperature of 400℃. The optical properties concerning the absorp-tion, transmission, reflection, Raman and the photoluminescence spectra are studied for the prepared film. The structure of the ZnO film was tested with the X-Ray diffraction and it was found to be a polycrystalline with recognized peaks oriented in (002), and (102). The measured of three photon absorption coefficient was found to be about 0.0166 cm3/Gwatt2, which is about five times higher than the bulk value. The fully computerized z-scan system was used to measure the nonlinear coefficients from the Gaussian fit of the transmitted laser incident.