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Title: Reversible ultrafast melting in bulk CdSe

In this work, transient reflectivity changes in bulk CdSe have been measured with two-color femtosecond pump-probe spectroscopy under a wide range of pump fluences. Three regions of reflectivity change with pump fluences have been consistently revealed for excited carrier density, coherent phonon amplitude, and lattice temperature. For laser fluences from 13 to 19.3 mJ/cm{sup 2}, ultrafast melting happens in first several picoseconds. This melting process is purely thermal and reversible. A complete phase transformation in bulk CdSe may be reached when the absorbed laser energy is localized long enough, as observed in nanocrystalline CdSe.
Authors:
 [1] ;  [2] ; ;  [3] ;  [2]
  1. School of Electronic Engineering, Heilongjiang University, Harbin 150080 (China)
  2. (United States)
  3. Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
22494990
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 5; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; CADMIUM SELENIDES; CARRIER DENSITY; COLOR; CRYSTALS; LASERS; MELTING; NANOSTRUCTURES; PHONONS; PROBES; REFLECTIVITY; SPECTROSCOPY; TRANSIENTS