Impact of gravitational force on high repetition rate filamentation of femtosecond laser pulses in the atmosphere
Applied Physics Letters,
Год журнала:
2024,
Номер
124(15)
Опубликована: Апрель 8, 2024
We
study
the
influence
of
gravitational
force
on
generation
low-density
channels
air
left
in
path
femtosecond
laser
filaments
at
high
repetition
rate.
observe
a
more
important
density
variation
along
filament
longitudinal
axis
case
vertically
created
as
compared
to
horizontal
one.
This
leads
reduction
electrical
breakdown
field
using
vertical
filament.
geometry
induced
difference
is
only
observed
rate
because
it
directly
related
cumulative
effect
appearing
above
100
Hz.
Язык: Английский
Pulse repetition-rate effect on the critical power for self-focusing of femtosecond laser in air
Optics Express,
Год журнала:
2024,
Номер
32(16), С. 28048 - 28048
Опубликована: Июль 9, 2024
The
femtosecond
laser
filamentation
is
of
significant
interest
due
to
its
remarkable
characteristics,
and
determining
the
critical
power
self-focusing
essential
for
process
filamentation.
In
this
work,
intense
pulses
at
different
repetition
rates
experimentally
measured
according
focus-shift
method.
A
bimodal
fitting
method
proposed
more
accurately
determine
power.
It
found
that
decreases
as
rate
increases.
numerical
simulation
based
on
modified
nonlinear
Schrödinger
equation
effectively
explains
experimental
results
obtained.
This
work
provides
valuable
insights
generation
application
high
Язык: Английский
Time-resolved measurements of cumulative effects in gas dynamics induced by high-repetition-rate femtosecond laser filamentation
Applied Physics Letters,
Год журнала:
2025,
Номер
126(17)
Опубликована: Апрель 28, 2025
The
advent
of
high-average-power,
ultrafast
ytterbium-based
lasers
allows
us
to
generate
laser
filaments
at
repetition
rates
ranging
from
tens
kHz
up
hundreds
kHz.
At
such
high-repetition
rates,
the
inter-pulse
time
lies
below
required
for
total
diffusion
deposited
heat
by
each
pulse,
leading
cumulative
hydrodynamic
effects.
Here,
we
present
experimental
time-resolved
measurements
these
dynamics
in
air
between
1
and
100
We
measure
change
refractive
index
caused
localized
deposition
length
filament-generated
plasma
channel,
with
which
can
infer
corresponding
density.
observe
that
above
10
kHz,
stationary
density
depletions
vanishing
emerge.
Our
findings
are
wide
relevance
fields
high-repetition-rate
filamentation
its
applications
as
well
THz
generation
laser-induced
sources.
Язык: Английский
Effect of repetition rate on ultrashort pulse laser propagation and energy deposition
Опубликована: Янв. 26, 2024
Modern
USPL
(Ultra
Short
Pulse
Laser)
development
is
trending
towards
higher
repetition
rates
and
average
power
systems.
High
peak
power,
low
rate
USPLs
have
long
been
used
to
generate
laser
filaments,
which
consist
of
a
plasma
channel
region
focused
high
intensity
propagation.
Filamentation
leads
heat
deposition
in
the
air
from
linear
nonlinear
effects,
producing
gas
density
depression
that
persists
over
hydrodynamic
timescales
(milliseconds).
This
after
femtosecond
pulse
has
passed.
In
"single
shot"
(approximately
10
Hz)
regime
filamentation,
time
between
pulses
allows
return
equilibrium
before
next
arrives.
Prior
work
experimentally
measured
single
shot
via
interferometry
demonstrated
filamentation
deflection
subsequent
due
residual
heating
prior
pulses.
examines
thermal
blooming
as
function
rate.
Residual
effects
are
through
measurements
energy
by
filament.
The
temporally
spatially
resolved
extracted
interferometric
phase
shift
depression.
Comparison
made
experimentation
modeling,
well
verification
past
results.
demonstrates
how
atmospheric
propagation
modern
differ
traditional
Язык: Английский
Quasi-stationary hydrodynamics in high repetition rate filamentation
Опубликована: Янв. 1, 2024
We
present
the
first
experiments
and
characterization
of
filamentation
at
high
energy
repetition
rates
(≥
10
kHz),
showing
a
quasi-stationary
depletion
offering
improved
electric
discharge
triggering
guidelines
for
future
laser
research.
Язык: Английский
Physics and technology of Laser Lightning Control
Reports on Progress in Physics,
Год журнала:
2024,
Номер
87(11), С. 116401 - 116401
Опубликована: Сен. 17, 2024
The
recent
development
of
high
average,
peak
power
lasers
has
revived
the
effort
using
as
a
potential
tool
to
influence
natural
lightning.
Although
impressive,
current
progress
in
laser
lightning
control
technology
may
only
be
beginning
new
area
involving
positive
feedback
between
powerful
and
atmospheric
research.
In
this
review
paper,
we
critically
evaluate
past,
present
future
Laser
Lightning
Control
(LLC),
considering
both
its
technological
scientific
significance
Язык: Английский