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Coherent Vibrational Dynamics
Guglielmo Lanzani, Giulio Cerullo, Sandro De Silvestri, Guglielmo Lanzani, Giulio Cerullo, Sandro De Silvestri
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eBook - PDF
Coherent Vibrational Dynamics
Guglielmo Lanzani, Giulio Cerullo, Sandro De Silvestri, Guglielmo Lanzani, Giulio Cerullo, Sandro De Silvestri
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Remarkable developments in the spectroscopy field regarding ultrashort pulse generation have led to the possibility of producing light pulses ranging from 50 to5 fs and frequency tunable from the near infrared to the ultraviolet range. Such pulses enable us to follow the coupling of vibrational motion to the electronic transitions in molecules and
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34
Coherent
Vibrational
Dynamics
SampleĀ
Lock-inĀ
Ampliļ¬erĀ
PDĀ
ComputerĀ
ControlledĀ
DelayĀ
LineĀ
(Ļ)Ā
OpticalĀ
ModulatorĀ
PumpĀ
BS1Ā
BS2Ā
ProbeĀ
SHGĀ
12.3Ā
M1Ā
AFĀ
MCĀ
PDĀ
DelayĀ
LineĀ
NOPA1Ā
M2Ā
NOPA2Ā
FIGURE
1.20
Scheme
of
the
two-color
pump-probe
system
based
on
NOPAs.
BS,
beam
splitters;
AF,
attenuating
ļ¬lter;
M1,
M2,
metal
mirrors;
MC,
monochromator;
PD,
photode-
tector;
SHG,
second-harmonic
generation
crystal
for
auto-/cross-correlation.
Figure
1.20
shows
the
schematic
of
a
two-color
pump-probe
system
based
on
NOPAs,
providing
sub-20-fs
temporal
resolution
[98,
106]
over
a
broad
spectral
range.
The
laser
source
is
a
CPA
Ti:sapphire.
The
system
is
used
to
pump
two
independent
NOPAs,
each
of
which
can
be
conļ¬gured
to
deliver
ultrashort
pulses
from
the
visible
(500ā720
nm)
to
the
near-IR
(900ā1500
nm).
The
pump-probe
setup
is
designed
to
accommodate
a
broad
range
of
pump
and
probe
wavelengths,
maintaining
a
very
high
temporal
resolution.
It
is
based
on
a
balanced
Michelson
interferometer:
beam
splitters
BS1
and
BS2
consist
of
120-
Ī¼
m-thick
glass
slides
coated
with
Inconel.
This
coating
guarantees
a
nearly
uniform
40%
reļ¬ection