Gallium transformation under femtosecond laser excitation: Phase coexistence and incomplete melting
نویسندگان
چکیده
O. P. Uteza,1,2 E. G. Gamaly,1,* A. V. Rode,1 M. Samoc,1 and B. Luther-Davies1 1Laser Physics Centre, Research School of Physical Sciences and Engineering Australian National University, Canberra, ACT 0200 Australia 2LP3 Lasers, Plasmas and Photonic Processes Laboratory, FRE 2165 CNRS – Aix-Marseille II University, Case 917, 163, Avenue de Luminy, 13288 Marseille Cedex 9, France (Received 3 April 2003; revised manuscript received 12 September 2003; published 30 August 2004)
منابع مشابه
Phase transformations of an InSb surface induced by strong femtosecond laser pulses.
Phase transformations of InSb~211! induced by 130-fs laser pulses at 800 nm have been time resolved in a wide range of laser fluences. The pump-probe technique has been used, where both optical reflectivity and reflected second-harmonic generation ~SHG! from the probe pulses are monitored as functions of probe versus pump pulse delay. The results are indicative of InSb undergoing a phase transi...
متن کاملDynamics of Ultrafast Phase Changes in Amorphous GeSb Films
The existence of nonthermal, ultrafast phase transitions after strong femtosecond laser excitation has been demonstrated in several materials such as silicon [1–3], gallium arsenide [3–6], indium antimonide [7], and carbon [8]. It is accepted that such transitions are induced by a softening of the lattice structure due to the generation of a very high density electron-hole plasma, as first prop...
متن کاملInternal stress-induced melting below melting temperature at high-rate laser heating
Articles you may be interested in Phase field simulation of kinetic superheating and melting of aluminum nanolayer irradiated by pico-and femtosecond laser Appl. Highly localized heat generation by femtosecond laser induced plasmon excitation in Ag nanowires Appl. Origin of temperature plateaus in laser-heated diamond anvil cell experiments Ultrafast melting and resolidification of gold particl...
متن کاملThermal excitation of d band electrons in Au: implications for laser-induced phase transformations
The temperature dependences of the electron heat capacity and the electron-phonon coupling factor are investigated for Au based on the electron density of states obtained from ab initio electronic structure calculations. Thermal excitation of d band electrons leads to a significant (up to an order of magnitude) increase in the electronphonon coupling factor and makes a considerable contribution...
متن کاملLaser-Induced Shape Changes of Colloidal Gold Nanorods Using Femtosecond and Nanosecond Laser Pulses
Gold nanorods have been found to change their shape after excitation with intense pulsed laser irradiation. The final irradiation products strongly depend on the energy of the laser pulse as well as on its width. We performed a series of measurements in which the excitation power was varied over the range of the output power of an amplified femtosecond laser system producing pulses of 100 fs du...
متن کامل