Dynamics of fracture inside a single crystal induced by a focused femtosecond laser pulse

Masaaki Sakakura; Takaya Tochio; Yuki Ishiguro; Miki Nakabayashi; Yasuhiko Shimotsuma; Kazuyuki Hirao; Kiyotaka Miura

doi:10.1117/12.976339

4 December 2012 Dynamics of fracture inside a single crystal induced by a focused femtosecond laser pulse

Masaaki Sakakura, Takaya Tochio, Yuki Ishiguro, Miki Nakabayashi, Yasuhiko Shimotsuma, Kazuyuki Hirao, Kiyotaka Miura

Proceedings Volume 8530, Laser-Induced Damage in Optical Materials: 2012; 853003 (2012) https://doi.org/10.1117/12.976339
Event: SPIE Laser Damage, 2012, Boulder, Colorado, United States

Abstract

Laser-induced deformation depends on the atomic structure of the material. In amorphous materials, the deformation is random or isotropic. On the other hand, in single crystals, anisotropic deformations occur in the specific directions, which is because of their regularly-arranged atomic structures. For example, when a fs laser pulse is focused inside rock-salt type crystalline materials (MgO, LiF, etc.) normal to the (001) plane, a void is formed in the photoexcited region and highly concentrated dislocation bands and cleavages are formed in the <110> and <100> directions, respectively. The directions of the dislocation bands and cleavages are often explained by the slip and cleavage planes of the crystals, however, stresses that induce these modifications have not been elucidated. In this study, we observed the dynamics of transient stress distributions after photoexcitation inside various single crystals by a pump-probe polarization microscope. After a femtosecond laser pulse was focused inside a MgO single crystal normal to the (001) plane, a void appeared in the photoexcited region and two stress waves (primary and secondary stress waves) were generated. In the primary stress wave, which propagated faster than the secondary one, the direction of the strain was identical to the propagation direction and the stress direction depended on the direction from the photoexcited region. In the secondary stress wave, there were tensile stresses normal to the (100) planes, which were identical to the cleavage planes.

Citation Download Citation

Masaaki Sakakura, Takaya Tochio, Yuki Ishiguro, Miki Nakabayashi, Yasuhiko Shimotsuma, Kazuyuki Hirao, and Kiyotaka Miura "Dynamics of fracture inside a single crystal induced by a focused femtosecond laser pulse", Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 853003 (4 December 2012); https://doi.org/10.1117/12.976339

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