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Conversion of out-of-phase to in-phase order in coupled laser arrays with second harmonics 被引量:1
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作者 Chene Tradonsky Micha Nixon +4 位作者 Eitan Ronen Vishwa Pal Ronen Chriki Asher A.Friesem Nir Davidson 《Photonics Research》 SCIE EI 2015年第3期77-81,共5页
A novel method for converting an array of out-of-phase lasers into one of in-phase lasers that can be tightly focused is presented.The method exploits second-harmonic generation and can be adapted for different laser ... A novel method for converting an array of out-of-phase lasers into one of in-phase lasers that can be tightly focused is presented.The method exploits second-harmonic generation and can be adapted for different laser arrays geometries.Experimental and calculated results,presented for negatively coupled lasers formed in a square,honeycomb,and triangular geometries are in good agreement. 展开更多
关键词 Conversion of out-of-phase to in-phase order in coupled laser arrays with second harmonics
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Relationship between Dislocation Density in P91 Steel and Its Nonlinear Ultrasonic Parameter 被引量:3
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作者 Ye-qing CAI Jin-zhong SUN +2 位作者 Cheng-jie LIU Shi-wei MA Xi-cheng WEI 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第11期1024-1030,共7页
P91 steel is an important bearing material used in nuclear power plants. The study of its mechanical degradation behavior is important for ensuring safe operation. The relationship between the dislocation density of P... P91 steel is an important bearing material used in nuclear power plants. The study of its mechanical degradation behavior is important for ensuring safe operation. The relationship between the dislocation density of P91 steel under different strains and the corresponding nonlinear ultrasonic parameter β was studied. The dislocation density of strained samples was estimated by X-ray diffraction. Nonlinear ultrasonic testing was conducted to evaluate β, showing that this value increased with increasing dislocation density induced by different tensile elongations. It was shown that the ultrasonic secondharmonic generation technique can effectively evaluate the degradation behavior of metallic materials, and the prediction of the residual life of bearing parts in service can be made based on β and the dislocation density. 展开更多
关键词 dislocation density P91 steel nonlinear ultrasonic second order harmonic
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