Laser-induced structural modification in bulk of single-crystal sapphire

Z. U. Rehman; K. Kyeong; W. G. Jung; N. T. Le; K. A. Tran; V. H. Nguyen; B. J. Kim; K. A. Janulewicz

doi:10.1117/12.2185784

14 July 2015 Laser-induced structural modification in bulk of single-crystal sapphire

Z. U. Rehman, K. Kyeong, W. G. Jung, N. T. Le, K. A. Tran, V. H. Nguyen, B. J. Kim, K. A. Janulewicz

Proceedings Volume 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers; 953215 (2015) https://doi.org/10.1117/12.2185784
Event: Pacific Rim Laser Damage, 2015, Jiading, Shanghai, China

Abstract

We present characterization of structural modification triggered by tightly focused single pulses of a nanosecond laser inside single-crystal sapphire. Structural changes induced in the shock compressed region were investigated using high resolution transmission electron microscopy (HRTEM). Analysis of the zone around cavity in the bulk of sapphire reveals loss of crystalline order and formation of a mixture of amorphous/poly-crystalline structure. The properties of the laser-affected solid and possible routes of material transformation to the final state long after the pulse end is discussed. The results suggest that transformations to amorphous/poly-crystalline state occur as a result of sufficient heating of the shell region. This creates a localized molten zone which solidifies so rapidly that crystallization is by-passed.

Citation Download Citation

Z. U. Rehman, K. Kyeong, W. G. Jung, N. T. Le, K. A. Tran, V. H. Nguyen, B. J. Kim, and K. A. Janulewicz "Laser-induced structural modification in bulk of single-crystal sapphire", Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 953215 (14 July 2015); https://doi.org/10.1117/12.2185784

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