X-ray Diffraction Study of Laser-Material Interactions with an Ultrafast Table-Top X-ray Source

1997 ◽  
Vol 502 ◽  
Author(s):  
T. Guo ◽  
C. Rose-Petruck ◽  
R. X. Jimenez ◽  
J. A. Squier ◽  
B. C. Walker ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Laser System ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Ray Diffraction ◽  
Diffraction Intensity ◽  
Laser Material ◽  
X Ray ◽  
Laser Illumination ◽  
Terawatt Laser

ABSTRACTX-ray diffraction, employing a table-top, laser-driven x-ray source, has been used to investigate laser-material interactions with simultaneous picosecond and subatomic range distance resolution. The x-ray source, consisting of a table-top terawatt laser system and a moving Cu wire target apparatus, generates ˜ 5 × 1010 photons (4π steradians s)−1 of Cu Kα radiation. The lattice dynamics of the (111) planes of GaAs single crystals has been studied after the crystal is exposed to intense femtosecond laser pulses. The diffraction results have yielded information about the timescale of the lattice dynamics in the picosecond range and an upper limit for the width of the xray pulses. Initial strain, defined as the percentage of lattice distortion resulted from the laser illumination, is as high as 0.25% and is followed by an exponential decay with a time constant of ˜ 150 ps. Increases in the diffraction intensity after the laser irradiation have also been observed, likely due to a transition from dynamic to kinematic diffraction associated with degradation of the crystal.

scholarly journals The time-resolved hard X-ray diffraction endstation KMC-3 XPP at BESSY II

2021 ◽  
Vol 28 (3) ◽  
Author(s):  
Matthias Rössle ◽  
Wolfram Leitenberger ◽  
Matthias Reinhardt ◽  
Azize Koç ◽  
Jan Pudell ◽  
...  
Keyword(s):  
Storage Ring ◽  
Single Photon ◽  
Laser System ◽  
High Vacuum ◽  
Laser Pulses ◽  
Pixel Detector ◽  
X Ray Diffraction ◽  
Optical Pump ◽  
Time Resolved ◽  
X Ray

The time-resolved hard X-ray diffraction endstation KMC-3 XPP for optical pump/X-ray probe experiments at the electron storage ring BESSY II is dedicated to investigating the structural response of thin film samples and heterostructures after their excitation with ultrashort laser pulses and/or electric field pulses. It enables experiments with access to symmetric and asymmetric Bragg reflections via a four-circle diffractometer and it is possible to keep the sample in high vacuum and vary the sample temperature between ∼15 K and 350 K. The femtosecond laser system permanently installed at the beamline allows for optical excitation of the sample at 1028 nm. A non-linear optical setup enables the sample excitation also at 514 nm and 343 nm. A time-resolution of 17 ps is achieved with the `low-α' operation mode of the storage ring and an electronic variation of the delay between optical pump and hard X-ray probe pulse conveniently accesses picosecond to microsecond timescales. Direct time-resolved detection of the diffracted hard X-ray synchrotron pulses use a gated area pixel detector or a fast point detector in single photon counting mode. The range of experiments that are reliably conducted at the endstation and that detect structural dynamics of samples excited by laser pulses or electric fields are presented.

X-ray diffraction from the ripple structures created by femtosecond laser pulses

2010 ◽  
Vol 100 (1) ◽  
pp. 105-112 ◽  
Author(s):  
A. Jurgilaitis ◽  
R. Nüske ◽  
H. Enquist ◽  
H. Navirian ◽  
P. Sondhauss ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Ray Diffraction ◽  
X Ray

Subpicosecond X-ray diffraction study of laser-induced disorder dynamics above the damage threshold of organic solids

1999 ◽  
Vol 32 (5) ◽  
pp. 977-981 ◽  
Author(s):  
A. Rousse ◽  
C. Rischel ◽  
I. Uschmann ◽  
E. Förster ◽  
P. A. Albouy ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Ray Diffraction ◽  
Optical Pump ◽  
Time Resolved ◽  
Lb Films ◽  
X Ray ◽  
Langmuir Blodgett ◽  
Acid Phthalate

Ultrafast disordering in Langmuir–Blodgett (LB) films and TlAP (thallium acid phthalate) crystals has been investigated by optical-pump–X-ray-probe experiments using intense femtosecond laser pulses. A laser-produced plasma X-ray source at 7.12 Å wavelength is used to study atomic dynamics by subpicosecond time-resolved X-ray diffraction. It is found that a drop of the X-ray diffracted intensity appears with time constants from below 600 fs up to a few tens of picoseconds in LB films optically excited at laser fluxes from 1.8 to 27 J cm−2. This loss in the diffracted intensity is understood as a displacement of the diffracting atoms by ∼8 Å from their equilibrium position. The response of the TlAP crystal was significantly slower. The relation to the atomic structure of the materials is discussed.

scholarly journals Generation, characterization, and medical utilization of laser-produced emission continua

2000 ◽  
Vol 18 (3) ◽  
pp. 563-570 ◽  
Author(s):  
S. SVANBERG ◽  
S. ANDERSSON-ENGELS ◽  
R. CUBEDDU ◽  
E. FÖRSTER ◽  
M. GRÄTZ ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Biomedical Applications ◽  
Laser System ◽  
Laser Pulses ◽  
Medical Utilization ◽  
X Rays ◽  
Visible Radiation ◽  
X Ray ◽  
Optical Mammography ◽  
Terawatt Laser

Intense continua of electromagnetic radiation of very brief duration are formed in the interaction of focused ultra-short terawatt laser pulses with matter. Two different kinds of experiments, which have been performed utilizing the Lund 10 Hz titanium-doped sapphire terawatt laser system are being described, where visible radiation and X-rays, respectively, have been generated. Focusing into water leads to the generation of a light continuum through self-phase modulation. The propagation of the light through tissue was studied addressing questions related to optical mammography and specific chromophore absorption. When terawatt laser pulses are focused onto a solid target with high nuclear charge Z, intense X-ray radiation of few ps duration and with energies exceeding hundreds of keV is emitted. Biomedical applications of this radiation are described, including differential absorption and gated-viewing imaging.

scholarly journals Characterization of X-ray radiation from solid Sn target irradiated by femtosecond laser pulses in the presence of air plasma sparks

2016 ◽  
Vol 34 (3) ◽  
pp. 533-538 ◽  
Author(s):  
A. Curcio ◽  
M. Anania ◽  
F.G. Bisesto ◽  
A. Faenov ◽  
M. Ferrario ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Near Infrared ◽  
Laser Energy ◽  
Laser System ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Rays ◽  
Air Plasma ◽  
X Ray ◽  
Near Infrared Spectra

AbstractThe emission of X-rays from solid tin targets irradiated by low-energy (few mJ) femtosecond laser pulses propagated through air plasma sparks is investigated. The aim is that to better understand the X-ray emission mechanism and to show the possibility to produce proper radiation for spectroscopic and imaging applications with a table-top laser system. The utilization of a controlled ultrashort prepulse is found necessary to optimize the conversion efficiency of laser energy into Lα radiation. The optimum contrast between the main pulse and the controlled prepulse is found about 102. A correlation between the laser contrast value and the laser near-infrared spectra at the exit of the plasma spark is observed.

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