Generation and Propagation of a Picosecond Acoustic Pulse at a Buried Interface: Time-Resolved X-Ray Diffraction Measurements

Lee, S. H.; Cavalieri, Adrian L.; Fritz, David; Swan, M.; Hegde, Ravi S.; Reason, M.; Goldman, R. S.; Reis, David A.

doi:10.1103/physrevlett.95.246104

Cited by 41 publications

(24 citation statements)

References 24 publications

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“…[2][3][4][5][6] For instance, an optical laser pulse with an energy of μJ−mJ can excite a semiconductor material via either a direct heating or an intraband excitation and induce transient non-equilibrium states. These processes begin with initial carrier plasma generation and proceed via electron-lattice coupling until finally the system reaches thermal equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Synchronizing femtosecond laser with x-ray synchrotron operating at arbitrarily different frequencies

Lee

Eom

et al. 2014

Review of Scientific Instruments

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The ability to synchronize a femtosecond laser to x-ray pulses is crucial for performing ultrafast time-resolved x-ray scattering experiments at synchrotrons. Conventionally, the task has been achieved by locking a harmonic frequency of the laser oscillator to the storage ring master radio-frequency (RF). However, when the frequency mismatch between the two sources cannot be compensated by small adjustments to the laser cavity length, synchronization to a harmonic frequency requires modifying the optical components of the laser system. We demonstrate a novel synchronization scheme, which is a flexible alternative for synchronizing these two sources operating at arbitrarily different frequencies. First, we find the greatest common divisor (GCD) of the two frequencies that is still within the limited tuning range of the laser cavity length. The GCD is generated by dividing down from the storage ring RF, and is separately multiplied up to provide a feedback signal for synchronizing the laser cavity. Unique to our scheme, the GCD also serves as a harmonic RF source for the laser amplifier such that only laser oscillator pulses at fixed integer multiples of the storage ring RF are selected for amplification and delivery to experiments. Our method is implemented at the Photon Test Facility beamline of Pohang Light Source where timing-jitter less than 4 ps (r.m.s.) is measured using a new shot-to-shot method.

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Section: Introductionmentioning

confidence: 99%

Synchronizing femtosecond laser with x-ray synchrotron operating at arbitrarily different frequencies

Lee

Eom

et al. 2014

Review of Scientific Instruments

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“…Some examples of these processes include impulsive strain generation, 4,5 ballistic phonon heat conduction, 6 and the production of transverse strain. 7 These optically induced reversible processes usually modify lattice spacings by parts per ten thousand or less.…”

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confidence: 99%

Measuring femtometer lattice displacements driven by free carrier diffusion in a polycrystalline semiconductor using time-resolved x-ray scattering

Landahl

DiChiara

et al. 2018

Applied Physics Letters

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We show that time-resolved x-ray scattering can be applied to polycrystalline materials for the measurement of carrier diffusion. A polycrystalline indium antimonide sample is prepared by high-intensity ultrafast laser surface melting and re-solidification under vacuum to create randomly oriented grains with an average size of 13 nm. Two static diffraction rings are simultaneously observed on a gated pixel array detector. Their centroids move following lower-intensity laser excitation, and utilizing an in-situ angular calibration, the transient lattice spacing is determined with femtometer accuracy, thereby allowing the measurement of charge carrier dynamics. Compared to bulk calculations, we find that carrier diffusion slows by more than one order of magnitude. This result provides evidence for the formation of potential energy barriers at the grain boundaries and demonstrates the capability of time-resolved x-ray scattering to probe nanoscale charge transport in materials other than near-perfect crystals.

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“…In contrast, with the advance of X-ray synchrotron sources that can generate high-flux, ultrashort X-ray pulses, time-resolved X-ray diffraction (scattering) and absorption techniques have become general and powerful tools to explore structural dynamics of matters. Accordingly, the techniques have been successfully applied to studying various dynamics of chemical and biological systems (Coppens, 2003;Coppens et al, 2004;Ihee, 2009;Ihee et al, 2005b;Kim et al, 2002;Schotte et al, 2003;Srajer et al, 1996;Techert et al, 2001;Tomita et al, 2009) and of condensed matters Cavalleri et al, 2006;Collet et al, 2003;Fritz et al, 2007;Gaffney et al, 2005;Lee et al, 2005;Lindenberg et al, 2005). On one hand, time-resolved X-ray diffraction enables us to access to the mechanism of structural transformations at the atomic level in crystalline state (Collet et al, 2003;Schotte et al, 2003;Srajer et al, 1996;Techert et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Synchrotron-Based Time-Resolved X-ray Solution Scattering (Liquidography)

Adachi¹,

Kim²,

Ihee³

2010

Advances in Lasers and Electro Optics

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Generation and Propagation of a Picosecond Acoustic Pulse at a Buried Interface: Time-Resolved X-Ray Diffraction Measurements

Cited by 41 publications

References 24 publications

Synchronizing femtosecond laser with x-ray synchrotron operating at arbitrarily different frequencies

Synchronizing femtosecond laser with x-ray synchrotron operating at arbitrarily different frequencies

Measuring femtometer lattice displacements driven by free carrier diffusion in a polycrystalline semiconductor using time-resolved x-ray scattering

Synchrotron-Based Time-Resolved X-ray Solution Scattering (Liquidography)

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