Dynamics of interference of femtosecond laser-induced stress waves and crack formation inside a LiF single crystal

Masaaki Sakakura; Naoaki Fukuda; Yasuhiko Shimotsuma; Kiyotaka Miura

doi:10.1117/12.2036866

6 March 2014 Dynamics of interference of femtosecond laser-induced stress waves and crack formation inside a LiF single crystal

Masaaki Sakakura, Naoaki Fukuda, Yasuhiko Shimotsuma, Kiyotaka Miura

Author Affiliations +

Proceedings Volume 8967, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX; 89670C (2014) https://doi.org/10.1117/12.2036866
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

When a femtosecond laser pulse is focused tightly inside a LiF single crystal, cracks are generated in the <100< directions from the photoexcited region. Previously, we found that cracks of different lengths are formed by simultaneous fs laser irradiation at multiple spots. To elucidate the mechanism of modulation in crack lengths, we observed the transient stress distributions after simultaneous fs laser irradiation at multiple spots inside a LiF single crystal. First, we found that stress amplitude can be doubled by the interference of fs laser induced stress waves. Next, we observed the dynamics of crack formation as well as the transient birefringence distribution. In the case in which one crack became shorter than other cracks, the observation of the crack dynamics showed that the compressive stress by a constrictive interference of stress waves at a crack tip prevented the crack from propagating further. However, In the case in which the elongation of one crack occurred, we could not find any relationship between the elongation of a crack and the interference of stress waves by the observed stress distribution. Based on the time-resolved observation, we discussed the mechanism of the modulation of the laser induced cracks by interference of stress waves.

Citation Download Citation

Masaaki Sakakura, Naoaki Fukuda, Yasuhiko Shimotsuma, and Kiyotaka Miura "Dynamics of interference of femtosecond laser-induced stress waves and crack formation inside a LiF single crystal", Proc. SPIE 8967, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX, 89670C (6 March 2014); https://doi.org/10.1117/12.2036866

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