Cart (Loading....) | Create Account
Close category search window
 

Interaction of CO2 laser pulses of microsecond duration with Al2O3 ceramic substrates

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Beyer, H. ; Central Institute of Electron Physics, Hausvogteiplatz 5‐7, O‐1086 Berlin, Germany ; Ross, W. ; Rudolph, R. ; Michaelis, A.
more authors

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.350246 

The working efficiency and other properties of laser‐induced surface plasmas have been compared for the case where two kinds of CO2 laser pulse interact with alumina substrates. Pulses of several times 10‐μs duration are able to drill hole patterns while producing negligible mechanical stresses in the material. However, because of the formation of a laser‐induced plasma which shields the material against the incoming laser beam, the drilling efficiency is rather low. A simple vaporization model shows that 30%–100% of the laser‐pulse energy is used for material processing. There is in addition a threshold energy of about 50 mJ, below which no material processing occurs. Plasma diagnosis verifies characteristic times of absorptive modulation in the range of 5–10 μs. Therefore, laser pulses of high repetition rate (≳10 kHz) and of a pulse duration below 5 μs have been used in order to overcome the above‐mentioned disadvantages. An important role with respect to the shielding effect is played by the electron density inside the laser‐induced plasmas, because the absorption coefficient of the laser light in these surface plasmas is proportional to the square of the electron density. The spatial and temporal distribution of the electron density during material processing is therefore continuously monitored by a beam‐deflection technique.

Published in:

Journal of Applied Physics  (Volume:70 ,  Issue: 1 )

Date of Publication:

Jul 1991

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.