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NUMERICAL SIMULATION OF THE TEMPERATURE FIELD IN A SOLDER BALL UNDER PULSED LASER AND ITS EFFECT ON THE VIBRATION OF THE SOLDER 被引量:3
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作者 C. Q. Wang M. Y. Li and L. Fang (National Key Laboratory of Advanced Welding Production Technology, H. I. T., Harbin 150001, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第1期168-172,共5页
The research presented here is focused on the vibration condition of a small volume solder solder ball,which is placed on the surface of a soldering pad and is exerted a pulse modulated continuous wave laser heat sour... The research presented here is focused on the vibration condition of a small volume solder solder ball,which is placed on the surface of a soldering pad and is exerted a pulse modulated continuous wave laser heat source. Finite element method is applied to analyzed the temperature field in the solder ball, and experi- ment is conducted to test the vibration. the results show that,that, the temperature field flucturates with the same frequency as that of the laser pulse, which in turn causes a forced vibration of the same frequency in the liquid solder ball. 展开更多
关键词 pulse modulated continuous wave laser finite element analysis forced vibration
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Effect of ballistic electrons on ultrafast thermomechanical responses of a thin metal film
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作者 熊启林 田昕 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期365-370,共6页
The ultrafast thermomechanical coupling problem in a thin gold film irradiated by ultrashort laser pulses with different electron ballistic depths is investigated via the ultrafast thermoelasticity model. The solution... The ultrafast thermomechanical coupling problem in a thin gold film irradiated by ultrashort laser pulses with different electron ballistic depths is investigated via the ultrafast thermoelasticity model. The solution of the problem is obtained by solving finite element governing equations. The comparison between the results of ultrafast thermomechanical coupling responses with different electron ballistic depths is made to show the ballistic electron effect. It is found that the ballistic electrons have a significant influence on the ultrafast thermomechanical coupling behaviors of the gold thin film and the best laser micromachining results can be achieved by choosing the specific laser technology(large or small ballistic range).In addition, the influence of simplification of the ultrashort laser pulse source on the results is studied, and it is found that the simplification has a great influence on the thermomechanical responses, which implies that care should be taken when the simplified form of the laser source term is applied as the Gaussian heat source. 展开更多
关键词 ultrafast thermomechanical coupling ballistic electrons ultrashort laser pulse finite element method
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Correction of dispersion distortion of femtosecond pulses by using the non-planar surface of diffractive optical elements
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作者 I.V.Minin O.V.Minin 《Chinese Optics Letters》 SCIE EI CAS CSCD 2004年第8期435-437,共3页
Peculiarities of propagation of femtosecond pulses through a focusing diffractive optical element (DOE) are considered. It is shown that the time delay between the pulse and phase wavefronts can be decreased by fabric... Peculiarities of propagation of femtosecond pulses through a focusing diffractive optical element (DOE) are considered. It is shown that the time delay between the pulse and phase wavefronts can be decreased by fabricating the DOE on the optimal curvilinear surface. 展开更多
关键词 Correction of dispersion distortion of femtosecond pulses by using the non-planar surface of diffractive optical elements DOE
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