Analysis of temperature and thermal stress fields of K9 glass damaged by 1064nm nanosecond pulse laser

Yunxiang Pan; Zhonghua Shen; Jian Lu; Xiaowu Ni

doi:10.1117/12.2004151

22 February 2013 Analysis of temperature and thermal stress fields of K9 glass damaged by 1064nm nanosecond pulse laser

Yunxiang Pan, Zhonghua Shen, Jian Lu, Xiaowu Ni

Proceedings Volume 8603, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II; 860308 (2013) https://doi.org/10.1117/12.2004151
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

There are residual scratches, inclusions and other forms of defects at surfaces of optical materials after the processes of grinding and polishing, which could either enhance the local electric field or increase the absorption rate of the material. As a result, the laser-induced damage threshold at the surface of the material is reduced greatly. In order to study underlying mechanisms and process of short pulsed laser-induced damage to K9 glass, a spatial axisymmetric model where the K9 glass was irradiated by a laser whose wavelength and pulse width are respectively 1064nm and 10ns was established. Taking into account the fact that the surface of the K9 glass is more likely to be damaged, 2μm-thick layers whose absorption coefficients are larger than bulk were set at both the input and output surfaces in the model. In addition, the model assumed that once the calculated tensile/compressive stress was greater than the tensile/compressive strength of K9 glass, the local absorption coefficient increased. The finite element method(FEM) was applied to calculate the temperature and thermal stress fields in the K9 glass. Results show that only the temperature of a small part of interacted region exceeds the melting point, while most of the damage pit is generated by thermal stress. The simulated damage morphology and the size of the damage region are consistent with those reported in literatures, which indicates that the model built in our work is reasonable.

Citation Download Citation

Yunxiang Pan, Zhonghua Shen, Jian Lu, and Xiaowu Ni "Analysis of temperature and thermal stress fields of K9 glass damaged by 1064nm nanosecond pulse laser", Proc. SPIE 8603, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II, 860308 (22 February 2013); https://doi.org/10.1117/12.2004151

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