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Non-thermal melting in semiconductors measured at femtosecond resolution
Ultrafast time-resolved optical spectroscopy has revealed new classes of physical, chemical and biological reactions, in which directed, deterministic motions of atoms have a key role. This contrastsExpand
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Grain size effect on the semiconductor-metal phase transition characteristics of magnetron-sputtered VO2 thin films
Single-phase vanadium dioxide (VO2) thin films have been grown on Si3N4∕Si substrates by means of a well-controlled magnetron sputtering process. The deposited VO2 films were found to exhibit aExpand
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Single shot phase contrast imaging using laser-produced Betatron x-ray beams.
Development of x-ray phase contrast imaging applications with a laboratory scale source have been limited by the long exposure time needed to obtain one image. We demonstrate, using the BetatronExpand
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Picosecond soft X-ray absorption measurement of the photo-inducedinsulator-to-metal transition in VO2.
We directly measure the photoinduced insulator-to-metal transition in VO2 using time-resolved near-edge x-ray absorption. Picosecond pulses of synchrotron radiation are used to detect the redshift inExpand
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K-alpha x-ray source using high energy and high repetition rate laser system for phase contrast imaging
K-alpha x-ray sources from laser produced plasmas provide completely new possibilities for x-ray phase-contrast imaging applications. By tightly focusing intense femtosecond laser pulses onto a solidExpand
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Band-selective measurements of electron dynamics in VO2 using femtosecond near-edge x-ray absorption.
We report on the first demonstration of femtosecond x-ray absorption spectroscopy, made uniquely possible by the use of broadly tunable bending-magnet radiation from "laser-sliced" electron bunchesExpand
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Enhanced photosusceptibility near Tc for the light-induced insulator-to-metal phase transition in vanadium dioxide.
We use optical-pump terahertz-probe spectroscopy to investigate the near-threshold behavior of the photoinduced insulator-to-metal (IM) transition in vanadium dioxide thin films. Upon approaching TcExpand
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Laser beam wavefront correction for ultra high intensities with the 200 TW laser system at the advanced laser light source.
We successfully implemented laser beam wavefront correction on the 200 TW laser system at the Advanced Laser Light Source. Ultra high intensities in excess of 10(20) W/cm(2) have been demonstrated.Expand
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Study of hard x-ray emission from intense femtosecond Ti:sapphire laser–solid target interactions
Interaction of intense Ti:sapphire laser with solid targets has been studied experimentally by measuring hard x-ray and hot electron generation. Hard x-ray (8–100 keV) emission spectrum and Kα x-rayExpand
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