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DESCRIPTION:Margaret Murnane\, University of Colorado at Boulder\n\nEver si
nce the invention of the laser 50 years ago\, scientists have been strivin
g to extend coherent laser-like beams into the x-ray region of the spectru
m. Very recently\, the prospects for tabletop x-ray beams at wavelengths <
10Å have brightened considerably. This advance is the direct result of a
new ability to manipulate electrons on their natural\, attosecond (10^-18s
)\, time-scales using femtosecond lasers. In recent work we uncovered a ne
w regime of nonlinear optics\, where bright laser-like X-ray supercontinua
with photon energies >1.6keV (wavelengths < 8Å) can be produced from a t
abletop femtosecond laser [1]. This represents the most extreme >5001 orde
r nonlinear optical process known. X-rays are powerful probes of the nanow
orld. They penetrate thick samples and can image small objects. This talk
will also highlight how ultrafast x-rays can capture the coupled motions o
f charges\, spins\, phonons and photons that underlie function on the fast
est timescales. [2\,3]\n
\n1. Popmintchev et al\, Science 336\, 1287 (
2012).
\n2. Mathias\, et al\, PNAS 109\, 4792 (2012).
\n3. Rudolf
et al.\, Nature Commun 3\, 1037 (2012).
DTSTART:20121109T210000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Bright Coherent Ultrafast X-Ray Beams on a Tabletop and Application
s in Nano and Materials Science
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