Mr. Wei Tang Profile

Wei Tang

at Univ of Chinese Academy of Science

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Proceedings Article | 4 May 2015 Paper

Research on nonlinear optical limiting properties of organic liquid crystal materials

Tingfeng Wang, Jian Qiao, Junfeng Shao, Wei Tang

Proceedings Volume 9543, 95431O (2015) https://doi.org/10.1117/12.2181840

KEYWORDS: Absorption, Transmittance, Laser energy, Optical limiting, Nonlinear optics, Pulsed laser operation, Liquid crystals, Molecules, Sensors, Laser scattering

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Nonlinear materials for optical limiting applications have drawn great attention because of its special features such as high linear transmission, strong nonlinear absorption and ultrafast response time. Optical limiting properties of two organic liquid crystal materials ( ILC and L34 ) are tested and analyzed in this paper. Firstly, Optical limiting test platform of ILC and L34 materials is set up by Nd:YAG laser with a pulse width of 5ns and the wavelength of 532nm. Then the transmittance of ILC and L34 materials irradiated by different laser energy density is measured. Finally, optical limiting mechanism of ILC and L34 materials is analyzed basing on two photon absorption (TPA) properties. The research results show that ILC and L34 materials have good nonlinear optical limiting properties to the 5ns, 532nm laser. The transmittance of ILC and L34 materials gradually drop with the increase of laser energy density. When laser energy density is less than 0.2J/cm², the transmittance of ILC material is roughly 80%. While once laser energy density is more than 2 J/cm², the transmittance decreases to 40%. In addition, nonlinear optical limiting property of L34 material is better than ILC material owing to high TPA properties of L34 material, and Optical limiting threshold of ILC material is higher than L34 material. Optical limiting threshold of ILC and L34 materials are 3J/cm² and 1.4J/cm² respectively. The conclusions have a reference value for laser protection on ILC and L34 materials.

Proceedings Article | 17 September 2013 Paper

Morphology and chemical composition analysis on multi-pulsed CO2 laser ablation of HgCdTe crystals

Wei Tang, Jin Guo, Jun-feng Shao, Ting-feng Wang

Proceedings Volume 8904, 89040L (2013) https://doi.org/10.1117/12.2032884

KEYWORDS: Crystals, Laser crystals, Carbon dioxide lasers, Chemical elements, Laser ablation, Mercury, Chemical analysis, Tellurium, Mercury cadmium telluride, Cadmium

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In order to study deeply damage mechanism of HgCdTe crystal irradiated by multi-pulsed CO₂ laser and obtain the characteristics of surface morphological and chemical composition changes. Firstly, Irradiation effect experiment is conducted on the Hg_0.826Cd_0.174Te crystal by pulsed CO₂ laser, which has a pulse width of 200ns and repetition frequency ranges from 1 Hz to 100 kHz. Then morphological and chemical composition changes of Hg_0.826Cd_0.174Te crystal is measured by field emission scanning electron microscope (FESEM) and damage threshold is obtained by morphology method. Finally, the impact of laser power density on morphological and chemical composition changes is analyzed. The research results show that: damage threshold of Hg_0.826Cd_0.174Te crystal which is irradiated by multi-pulsed CO₂ laser is 950 W/cm². The crystal surface melting phenomenon is very obvious, the obvious crack which is caused by thermal stress is not found in the surface, and a large number of bulges and pits are taken shape in the laser ablation zone. Chemical composition changes of the crystal are obvious, and a lot of O element is found in the laser ablation zone. With the increase of laser irradiation power, the content of Hg element decrease rapidly, the content of Cd, Te and O element raise by degrees, and chemical composition changes of the crystal are more and more obvious. When the irradiation power density is 1.8kW/cm², the surface becomes smooth in the ablation zone due to the impact of laser impulse force, and the content of the chemical compositions is that Hg accounts for 0.23%, Cd accounts for 21.38%, Te accounts for 26.27%, and O accounts for 52.12%. The conclusions of the study have a reference value for the Hg_0.826Cd_0.174Tecrystal in the application of making infrared detector and pulsed CO₂ laser in the aspect of laser processing.

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