Different photoluminescence （PL） spectra are observed for rf magnetron sputtered polycrystalline Mg0.25Zn0.75O and Mg0.37Zn0.63O films on silicon substrates when excited by different wavelengths. When the excitation...Different photoluminescence （PL） spectra are observed for rf magnetron sputtered polycrystalline Mg0.25Zn0.75O and Mg0.37Zn0.63O films on silicon substrates when excited by different wavelengths. When the excitation wavelength is 280nm, a UV emission peak at 370nm and a blue peak at 462nm are generated for the Mg0.25Zn0.75O film, and those two peaks for the Mg0.37Zn0.63O film shift to 366nm and 466nm, respectively. The wavelengths of the PL peaks are related to the excitation wavelength. The stronger peak is obtained in the blue band due to a large number of oxygen vacancies caused by excess Zn and Mg atoms, while the weaker peak is obtained in the ultraviolet band.展开更多
Nonlinear optical properties of an organo-metallic compound[(C_(4)H_(9))_(4)N][Ni(dmit)_(2)](dmit=2−thioxo-1,3-dithiole-4,5-dithiolate),abbreviated as BuNi,dissolved in acetone,are investigated using the Z-scan techni...Nonlinear optical properties of an organo-metallic compound[(C_(4)H_(9))_(4)N][Ni(dmit)_(2)](dmit=2−thioxo-1,3-dithiole-4,5-dithiolate),abbreviated as BuNi,dissolved in acetone,are investigated using the Z-scan technique with a 40 ps pulse width at 1064 nm and a 1 ns and 15 ns pulse width at 1053 nm.Strong saturable absorption is found when the sample solution is irradiated by 40 ps and 1 ns laser pulses.When irradiated with a 15 ns laser pulse,a stronger reverse saturable absorption is found.The nonlinear optical absorption coefficients are-1.06×10^(-11),−2.02×10^(-11) and 2.73×10^(−10) m/W,respectively.All the results suggest that BuNi may be a promising candidate in the application of laser pulse compression in the near-infrared waveband.展开更多
文摘Different photoluminescence （PL） spectra are observed for rf magnetron sputtered polycrystalline Mg0.25Zn0.75O and Mg0.37Zn0.63O films on silicon substrates when excited by different wavelengths. When the excitation wavelength is 280nm, a UV emission peak at 370nm and a blue peak at 462nm are generated for the Mg0.25Zn0.75O film, and those two peaks for the Mg0.37Zn0.63O film shift to 366nm and 466nm, respectively. The wavelengths of the PL peaks are related to the excitation wavelength. The stronger peak is obtained in the blue band due to a large number of oxygen vacancies caused by excess Zn and Mg atoms, while the weaker peak is obtained in the ultraviolet band.
基金Supported by the National Natural Science Foundation of China under Grant Nos.60778037,50772059 and 60608010the Foundation for the Author of National Excellent Doctoral Dissertation of China(No.200539)the Youth Scientist Fund of Shandong Province(BS2011CL025).
文摘Nonlinear optical properties of an organo-metallic compound[(C_(4)H_(9))_(4)N][Ni(dmit)_(2)](dmit=2−thioxo-1,3-dithiole-4,5-dithiolate),abbreviated as BuNi,dissolved in acetone,are investigated using the Z-scan technique with a 40 ps pulse width at 1064 nm and a 1 ns and 15 ns pulse width at 1053 nm.Strong saturable absorption is found when the sample solution is irradiated by 40 ps and 1 ns laser pulses.When irradiated with a 15 ns laser pulse,a stronger reverse saturable absorption is found.The nonlinear optical absorption coefficients are-1.06×10^(-11),−2.02×10^(-11) and 2.73×10^(−10) m/W,respectively.All the results suggest that BuNi may be a promising candidate in the application of laser pulse compression in the near-infrared waveband.
