An ultra-fast laser with central wavelength at 1064？nm and 10？ps pulse duration？was used to tightly focus laser radiation？with a microscope objective inside the volume of nucleated Lithium Aluminosilicate (LAS) glass-ceramic. The nonlinear absorption？of the LAS glass-ceramic was measured？for different laser parameters and a thermal simulation was performed to determine the temperature field inside the laser-modified area. After laser processing,？the samples were crystallized in a furnace and the effect of the laser-induced modifications on the microstructure was analyzed with SEM. The SEM analysis shows an increase in the length and size of whisker-shaped？β-spodumene crystals in the laser-modified area. By increasing the dimension of these whisker-shaped crystals, the flexural strength of LAS can be improved locally.？First？four-point bending flexural tests were performed to examine the influence on the mechanical properties.
References
[1]
Cam, P., et al. (2015) A Novel Laser-Based Method for Controlled Crystallization in Dental Prosthesis Materials. Proceedings SPIE, 9306, 930607.
https://doi.org/10.1117/12.2076567
[2]
Schaffer, C.B. (2001) Interaction of Femtosecond Laser Pulses with Transparent Materials. Ph.D. Thesis, Harvard University Cambridge, Massachusetts.
[3]
Mauclair, C., Memillod-Bolndin, A., Huot, N., Audouard, E. and Stoian, R. (2008) Ultrafast Laser Writing of Homogenous Longitudinal Waveguides in Glasses Using Dynamic Wavefront Correction. Optics Express, 16, 5481-5492.
https://doi.org/10.1364/OE.16.005481
[4]
Qiu, J., Miura, K. and Hirao, K. (1998) Three-Dimensional Optical Memory Using Glasses as a Recording Medium through a Multi-Photon Absorption Process. Japanese Journal of Applied Physics, 37, 2263-2266.
https://doi.org/10.1143/JJAP.37.2263
[5]
Masuda, M., Sugioka, K., Cheng, Y., Aoki, N., Kawachi, M., Shihoyama K., Toyoda, K., Helvajian, H. and Midorikawa, K. (2003) 3-D Microstructuring inside Photosensitive Glass by Femtosecond Laser Excitation. Applied Physics A, 76, 857-860.
https://doi.org/10.1007/s00339-002-1937-z
[6]
Miyamoto, I., Cvecek, K. and Schmidt, M. (2013) Crack-Free Conditions in Welding of Glass by Ultrashort Laser Pulse. Optics Express, 21, 14291-14302.
https://doi.org/10.1364/OE.21.014291
[7]
Johnston, T.F. (1998) Beam Propagation (M2) Measurement Made as Easy as It Gets: The Four-Cuts Method. Applied Optics, 37, 4840-4850.
https://doi.org/10.1364/AO.37.004840
[8]
Laczka, M., Laczka, K., Cholewa-Kowalska, K., Kounga, A.B. and Appert, C. (2013) Mechanical Properties of a Lithium Disilicate Strengthened Lithium Aluminosilicate Glass-Ceramic. Journal of the American Ceramic Society, 97, 1-4.
[9]
Blombergen, N. (1974) Laser-Induced Electric Breakdown in Solids. IEEE Journal of Quantum Electronics, 10, 375-386. https://doi.org/10.1109/JQE.1974.1068132
[10]
Calmano, T. (2013) Femtosekundenlasergeschriebene Kristalline Wellenleiterlaser im Sichtbaren und Nahen Infraroten Spektralbereich. Ph.D. Thesis, Universitat Hamburg, Germany.
[11]
Siebenmorgen, J. (2010) Herstellung von Wellenleiterlasern Mittels Femtosekunden-Laserstrukturierung in Nd- und Yb-Dotierten YAG-Kristallen. Ph.D. Thesis, Universitat Hamburg, Germany.
[12]
Miyamoto, I., Cvecek, K. and Schmidt, M. (2011) Evaluation of Nonlinear Absorptivity in Internal Modification of Bulk Glass by Ultrashort Laser Pulses. Optics Express, 19, 10714-10727. https://doi.org/10.1364/OE.19.010714
[13]
Carslaw, H.S. and Jaeger, J.C. (2005) Conduction of Heat in Solids. 2nd Edition, Clarendon Press, Oxford.
[14]
Miyamoto, I., Cvecek, K., Okamoto, Y., Schmidt, M. and Helvajian, H. (2011) Characteristics of Laser Absorption and Welding in FOTURAN Glass by Ultrashort Laser Pulses. Optics Express, 19, 22961-22973. https://doi.org/10.1364/OE.19.022961
[15]
Sakaue, K., Yoneyama, S., Kikuta, H. and Takashi, M. (2008) Evaluating Crack Tip Stress Field in a Thin Glass Plate under Thermal Load. Engineering Fracture Mechanics, 75, 1015-1026. https://doi.org/10.1016/j.engfracmech.2007.04.025
[16]
Shand, E.B. (1968) Engineering Glass, Modern Materials. Vol. 6, Academic Press, New York.
[17]
Anmin, H., Ming, L. and Dali, M. (2006) Preparation of Whisker β-Spodumene Glass-Ceramics. Journal of the American Ceramic Society, 89, 358-360.
https://doi.org/10.1111/j.1551-2916.2005.00681.x
