NDLI: Control of Material Transport Through Pulse Shape Manipulation

Content Provider	IEEE Xplore Digital Library
Author	Pangovski, K. Sparkes, M. Cockburn, A. O'Neill, W. Peh Siong Teh Dejiao Lin Richardson, D.
Copyright Year	1995
Abstract	The variety of laser systems available to industrial laser users is growing and the choice of the correct laser for a material target application is often based on an empirical assessment. Industrial master oscillator power amplifier systems with tuneable temporal pulse shapes have now entered the market, providing enormous pulse parameter flexibility in an already crowded parameter space. In this paper, an approach is developed to design interaction parameters based on observations of material responses. Energy and material transport mechanisms are studied using pulsed digital holography, post process analysis techniques and finite-difference modelling to understand the key response mechanisms for a variety of temporal pulse envelopes incident on a silicon 〈1\|1\|1〉 substrate. The temporal envelope is shown to be the primary control parameter of the source term that determines the subsequent material response and the resulting surface morphology. A double peak energy-bridged temporal pulse shape designed through direct application of holographic imaging data is shown to substantially improve surface quality.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	51
Ending Page	63
Page Count	13
File Size	1216977
File Format	PDF
ISSN	1077260X
Volume Number	20
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Materials Laser beams Optical surface waves Surface treatment Heating Imaging Laser ablation pulsed lasers Holographic interferometry holographic recording silicon laser ablation laser materials-processing applications
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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