Optics Letters,
Journal Year:
2021,
Volume and Issue:
46(18), P. 4686 - 4686
Published: Aug. 11, 2021
Nonlinear
pulse
post-compression
represents
an
efficient
method
for
ultrashort,
high-quality
laser
production.
The
temporal
quality
is,
however,
limited
by
amplitude
and
phase
modulations
intrinsic
to
post-compression.
We
here
characterize
in
frequency
time
domain
with
high
dynamic
range
individual
post-compressed
pulses
within
bursts
comprising
100-kHz-rate
trains.
spectrally
broaden
730
fs,
3.2
mJ
from
a
Yb:YAG
gas-filled
multi-pass
cell
post-compress
them
56
fs.
exhibit
nearly
constant
energy
content
of
78%
the
main
peak
over
burst
plateau,
which
is
close
theoretical
limit.
Our
results
demonstrate
attractive
characteristics,
making
lasers
very
applicable
pump–probe
spectroscopy
at,
e.g.,
free-electron
or
as
drivers
secondary
conversion
stages.
Optics Letters,
Journal Year:
2023,
Volume and Issue:
48(10), P. 2579 - 2579
Published: March 28, 2023
We
generated
1.7-cycle
and
35-$\mu$J
pulses
at
a
1-MHz
repetition
rate
by
using
two-stage
multiple
plate
continuum
compression
of
Yb-laser
with
80-W
average
input
power.
By
adjusting
the
positions
careful
consideration
thermal
lensing
effect
due
to
high
power,
we
compressed
output
pulse
184-fs
initial
duration
5.7
fs
only
group-delay-dispersion
compensation.
This
achieved
sufficient
beam
quality
($M^2$
<
1.5)
reaching
focused
intensity
over
10$^{14}$
W/cm$^2$
spatial-spectral
homogeneity
(98%).
Our
study
holds
promise
for
MHz-isolated-attosecond-pulse
source
advanced
attosecond
spectroscopic
imaging
technologies
unprecedentedly
signal-to-noise
ratios.
Optics Express,
Journal Year:
2021,
Volume and Issue:
29(4), P. 4842 - 4842
Published: Jan. 13, 2021
Recombination-driven
acoustic
pulses
and
heating
in
a
photoionized
gas
transiently
alter
its
refractive
index.
Slow
thermal
dissipation
can
cause
substantial
heat
accumulation
impair
the
performance
stability
of
gas-based
laser
systems
operating
at
strong-field
intensities
megahertz
repetition
rates.
Here
we
study
this
effect
by
probing
pulse-by-pulse
buildup
index
changes
gases
spatially
confined
inside
capillary.
A
high-power
repetition-rate-tunable
femtosecond
photoionizes
free-space
focus,
while
transverse-propagating
probe
interferometrically
monitors
resulting
time-dependent
The
system
allows
convenient
exploration
nonlinear
regimes
used
to
temporally
compress
with
durations
∼30
∼300
fs
range.
We
observe
gas-density
depressions,
milliseconds
duration,
that
saturate
level
depends
on
peak
intensity
rate
pulses,
good
agreement
numerical
modelling.
dynamics
are
independently
confirmed
measuring
mean
speed-of-sound
across
capillary
core,
allowing
us
infer
temperature
exceed
1000
K.
Finally,
explore
several
strategies
for
mitigating
these
effects
improving
high
Laser Physics Letters,
Journal Year:
2021,
Volume and Issue:
18(6), P. 065401 - 065401
Published: May 20, 2021
Abstract
The
simultaneous
nonlinear
spectral
broadening
and
temporal
cleaning
of
ultrashort
pulses
by
the
combination
multipass
cell
(MPC)
technique
ellipse
rotation
are
proposed
investigated
with
numerical
simulations.
performance
gas-filled
MPC
is
studied
at
800
1030
nm
central
wavelengths
mJ
energy
level.
results
indicate
that
least
10
3
contrast
enhancement
feasible
50%
internal
efficiency
while
beam
quality
preserved
during
propagation.
At
same
time,
allows
for
a
more
than
five-fold
compression.
tested
20
it
presumably
suitable
generation
high
contrast,
few-cycle
pulses,
too.
Optica,
Journal Year:
2023,
Volume and Issue:
11(1), P. 1 - 1
Published: Nov. 29, 2023
Reducing
the
pulse
repetition
rate
of
an
optical
frequency
comb
increases
energy
for
a
given
average
power.
This
enhances
efficiency
nonlinear
conversion
and
it
facilitates
extending
accessible
wavelength
range,
example,
into
extreme
ultraviolet
(XUV).
The
resulting
spectrally
dense
can
still
be
used
precision
spectroscopy
narrow
atomic
or
molecular
transitions.
In
this
paper,
we
demonstrate
low-noise
infrared
with
as
low
40
kHz
using
Yb:KYW
mode-locked
laser,
picking,
subsequent
amplification.
structure
is
confirmed
by
generating
beat
note
continuous
wave
reference
laser.
A
mode
actively
stabilized
to
integrated
rms
phase
noise
from
20
Hz
measured
195
mrad.
Optics Letters,
Journal Year:
2021,
Volume and Issue:
46(18), P. 4686 - 4686
Published: Aug. 11, 2021
Nonlinear
pulse
post-compression
represents
an
efficient
method
for
ultrashort,
high-quality
laser
production.
The
temporal
quality
is,
however,
limited
by
amplitude
and
phase
modulations
intrinsic
to
post-compression.
We
here
characterize
in
frequency
time
domain
with
high
dynamic
range
individual
post-compressed
pulses
within
bursts
comprising
100-kHz-rate
trains.
spectrally
broaden
730
fs,
3.2
mJ
from
a
Yb:YAG
gas-filled
multi-pass
cell
post-compress
them
56
fs.
exhibit
nearly
constant
energy
content
of
78%
the
main
peak
over
burst
plateau,
which
is
close
theoretical
limit.
Our
results
demonstrate
attractive
characteristics,
making
lasers
very
applicable
pump–probe
spectroscopy
at,
e.g.,
free-electron
or
as
drivers
secondary
conversion
stages.
