Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage

Stavros G. Demos; Raluca A. Negres; Rajesh N. Raman; Michael D. Feit; Kenneth R. Manes; Alexander M. Rubenchik

doi:10.1117/12.2195501

23 November 2015 Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage

Stavros G. Demos, Raluca A. Negres, Rajesh N. Raman, Michael D. Feit, Kenneth R. Manes, Alexander M. Rubenchik

Author Affiliations +

Proceedings Volume 9632, Laser-Induced Damage in Optical Materials: 2015; 96320S (2015) https://doi.org/10.1117/12.2195501
Event: SPIE Laser Damage, 2015, Boulder, Colorado, United States

Abstract

Laser induced damage (breakdown) initiated on the exit surface of transparent dielectric materials using nanosecond pulses creates a volume of superheated material reaching localized temperatures on the order of 1 eV and pressures on the order of 10 GPa or larger. This leads to material ejection and the formation of a crater. The volume of this superheated material depends largely on the laser parameters such as fluence and pulse duration. To elucidate the material behaviors involved, we examined the morphologies of the ejected superheated material particles and found distinctive morphologies. We hypothesize that these morphologies arise from the difference in the structure and physical properties (such as the dynamic viscosity and presence of instabilities) of the superheated material at the time of ejection of each individual particle. Some of the ejected particles are on the order of 1 µm in diameter and appear as “droplets”. Another subgroup appears to have stretched, foam-like structure that can be described as material globules interconnected via smaller in diameter columns. Such particles often contain nanometer size fibers attached on their surface. In other cases, only the globules have been preserved suggesting that they may be associated with a collapsed foam structure under the dynamic pressure as it traverses in air. These distinct features originate in the structure of the superheated material during volume boiling just prior to the ejection of the particles.

Citation Download Citation

Stavros G. Demos, Raluca A. Negres, Rajesh N. Raman, Michael D. Feit, Kenneth R. Manes, and Alexander M. Rubenchik "Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage", Proc. SPIE 9632, Laser-Induced Damage in Optical Materials: 2015, 96320S (23 November 2015); https://doi.org/10.1117/12.2195501

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available