Advanced Manufacturing Laboratory    

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Welcome to the Advanced Manufacturing Laboratory

Here we focus on the scientific investigation of advanced manufacturing processes to improve quality and productivity in industry, as well as advanced robotic techniques for industrial and health care applications.  Much of our work accomplishes this via laser technologies.

Recent Publications

Beneficial Interface Geometry for Laser Joining of NiTi to Stainless Steel Wires (2013).  G. Brandal, G. Satoh, Y.L. Yao, S. Naveed

By using a cup and cone geometry at the interface, the tensile strength of laser joined nickel titanium and stainless steel wires can be increased.  Precise heat input is necessary in order to prevent the formation of brittle intermetallic phases.

 

 

 

 

 

Laser Joining of Continuous Glass Fiber Composite Preforms (2013).  H. Tan, Y.L. Yao

A two step laser process is developed to form fusion bonds between fibers within a single bundle and between adjacent fiber bundles. Coupled heat transfer and viscous flow modeling is carried out to investigate the temperature and dynamics of the joining process under three experimentally observed conditions.

 

 

 

 

Effect of hydrogen on surface texturing and crystallization of a-S:H thin film irradiated by excimer laser (2012).  H. Wang, F. Lusquinos, Y.L. Yao

Excimer laser processing of amorphous silicon thin films produces micron size spikes formation on its surface, and simultaneous crystallization occurs in a one-step process. Optical absorption is enhanced by light trapping via multiple reflections through the surface geometry changes, and partial crystallization may increase the overall stability.

 

 

 

 

Recent News

 

Grant Brandal gave a guest lecture to an introductory mechanical engineering class.  The talk was aimed at exposing the students to various manufacturing methods, and the fundamental science behind these processes.  (11/20/2013)

Professor Yao was invited to visit and give a seminar at The Institute of Optics, University of Rochester, on November 4, 2013.  The topic of the presentation was "Laser Surface Texturing, Crystallization and Scribing of Thin Films in Solar Cell Applications."  (11/4/2013)

Master's student Jenny Ardelean recently traveled to Baltimore, Maryland to attend the Society of Women Engineers National Conference. As a representative of Columbia University, Jenny was able to talk with both undergraduate women and professional engineers in an effort to recruit graduate students to the university. (10/25/13)

Dr. Damir Kolich and Jesús del Val García have recently joined our lab as Visiting Scholars.  Damir received his PhD from University of Rijeka, Croatia.  His doctoral thesis is on lean manufacturing and Monte Carlo simulation.  He in fact was born near New York and has now returned to the US.  Jesus is with the laser materials processing group within the Applied Physics at University of Vigo, Spain.  His areas of research include laser micro-cladding.  Welcome to both (9/9/13)

 

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[This site was last updated on 12/11/2013]                                                                              | Department of Mechanical Engineering | SEAS | Columbia University |