Andrea Cavalleri: Publications

Time-resolved x-ray diffraction study of ultrafast acoustic phonon dynamics in Ge/Si-heterostructures

Optics InfoBase Conference Papers (2000) 218-220

Authors:

K Sokolowski-Tinten, M Horn von Hoegen, D von der Linde, A Cavalleri, CW Siders, FLH Brown, C Toth, JA Squier, CPJ Barty, KR Wilson, M Kammler

Abstract:

Using time-resolved x-ray diffraction the ultafast strain dynamics in fs-laserexcited Ge/Si-heterostructures has been studied. A fluence dependent, anharmonic damping of the impulsively generated acoustic phonons and vibrational transport across the buried Ge/Si-interface are observed.

Ultrafast coherent and incoherent X-ray generation by inner-shell atomic processes induced by <25 fs, >1 J pulses of high power CPA lasers

LASER PHYSICS 10:2 (2000) 513-520

Authors:

C Tóth, D Kim, BC Walker, T Guo, SH Son, CW Siders, A Cavalleri, CPJ Barty

X-ray movies of ultrafast atomic motion

Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 1 (1999) 110

Authors:

CPJ Barty, CW Siders, A Cavalleri, K Sokolowski-Tinten, T Guo, C Toth, R Jimenez, C Rose-Petruck, D von der Linde, KR Wilson

Abstract:

Using ultrafast X-ray, line radiation generated with a 20-fs multi-terawatt laser system, femtosecond induced lattice dynamics was observed in bulk semiconductors with milliangstrom spatial and picosecond resolution via time resolved X-ray diffraction. Coherent phonon generation and propagation, ultrafast melting of thin films and buried interface lattice coupling were observed.

Detection of nonthermal melting by ultrafast X-ray diffraction.

Science 286:5443 (1999) 1340-1342

Authors:

CW Siders, A Cavalleri, K Sokolowski-Tinten, C Tóth, T Guo, M Kammler, M Horn von Hoegen, KR Wilson, D von der Linde, CP Barty

Abstract:

Using ultrafast, time-resolved, 1.54 angstrom x-ray diffraction, thermal and ultrafast nonthermal melting of germanium, involving passage through nonequilibrium extreme states of matter, was observed. Such ultrafast, optical-pump, x-ray diffraction probe measurements provide a way to study many other transient processes in physics, chemistry, and biology, including direct observation of the atomic motion by which many solid-state processes and chemical and biochemical reactions take place.

Bulk phase explosion and surface boiling during short pulse laser ablation of semiconductors

IQEC, International Quantum Electronics Conference Proceedings (1999) 231-232

Authors:

K Sokolowski-Tinten, J Bialkowski, M Boing, A Cavalleri, D von der Linde

Abstract:

Femtosecond laser ablation of semiconductors was studied with a number of techniques, including time resolved microscopy and time-of-flight mass spectroscopy. The laser pulse excites a very dense electron-hole plasma in the semiconductor, leading to nonthermal melting on a sub-picosecond timescale. The liquid is left in a state of high temperature and high pressure.

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