Femtosecond Laser Synthesis of Polymorphic Diamond from Highly Oriented Pyrolytic Graphite
We synthesized polymorphic diamond directly from highly oriented pyrolytic graphite (HOPG) using femtosecond laser driven shock wave without catalyst. A femtosecond laser pulse (wavelength: 800 nm, pulse width: 120 fs, intensity: 2×1015 W/cm2) was irradiated onto the HOPG surface in air. Crystalline structures of HOPG after the laser irradiation were analyzed using the synchrotron X-ray at the BL13XU in the SPring-8. We found that the hexagonal diamond exists in the HOPG which was irradiated by the femtosecond laser normal to the basal plane.
Young Won Chang, Nack J. Kim and Chong Soo Lee
T. Sano et al., "Femtosecond Laser Synthesis of Polymorphic Diamond from Highly Oriented Pyrolytic Graphite", Materials Science Forum, Vols. 561-565, pp. 2349-2352, 2007