In
this
paper,
we
focus
on
the
single
crystal
material
germanium
(Ge),
which
is
fabricated
into
saturable
absorbers
(SA)
employing
liquid
phase
exfoliation,
and
validate
it
with
an
erbium-doped
fiber
laser
(EDFL).
The
Ge
SA
was
obtained
a
modulation
depth
of
9.8
%
saturation
intensity
11.02
MW/cm2.
wavelength
mode-lockedÂ
pulse
minimum
width
847
fs
at
cavity
length
10.5
m.
addition,
106
m,
dual
mode-locked
phenomenon
in
central
wavelengths
were
located
1559.20
nm
1561.31
nm.
experimental
results
show
that
nanosheets
EDFL
provide
strong
basis
for
development
nonlinear
optics
have
wide
range
applications
field
pulsed
lasers.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(38)
Published: July 24, 2024
This
study
enhances
the
ultrafast
photonics
application
of
tin
selenide
(SnSe)
nanoflakes
via
copper
(Cu)
functionalization
to
overcome
challenges
such
as
low
conductivity
and
weak
near-infrared
(NIR)
absorption.
Cu
concentration,
induces
strain,
reduces
bandgap
through
Sn
substitution
vacancy
filling
with
ions.
Demonstrated
by
density
functional
theory
calculations
experimental
analyses,
Cu-functionalized
SnSe
exhibits
improved
NIR
optical
absorption
superior
third-order
nonlinear
properties.
Z-scan
measurements
femtosecond
transient
spectroscopy
reveal
better
performance
in
terms
properties
shorter
carrier
relaxation
times
compared
pristine
SnSe.
Furthermore,
saturable
absorbers
based
on
both
types,
when
integrated
into
an
erbium-doped
fiber
laser,
show
that
leads
a
decrease
pulse
duration
798
fs
increase
3
dB
spectral
bandwidth
3.44
nm.
Additionally,
it
enables
stable
harmonic
mode-locking
bound-state
solitons.
work
suggests
new
direction
for
improving
wide
2D
materials
highlighting
enhanced
potential
photonics.
Optics Express,
Journal Year:
2024,
Volume and Issue:
32(9), P. 15472 - 15472
Published: April 2, 2024
As
a
new
member
of
two-dimensional
(2D)
phosphorene,
2D
layered
violet
phosphorus
(VP)
has
unique
optoelectronic
properties
and
good
environmental
stability,
showing
its
huge
advantages
in
applications.
In
this
paper,
the
ultrafast
nonlinear
optical
(NLO)
VP
nanosheets
at
1
µm
band
were
explored,
which
exhibit
an
obvious
saturable
absorption
response
with
modulation
depth
∼1.97%.
Meanwhile,
fast
slow
carrier
lifetimes
1µm
also
determined
as
295.9
fs
2.36
ps,
respectively,
are
much
shorter
than
that
most
reported
materials.
The
excellent
combined
ultrashort
indicate
prospect
absorber
(SA)
for
laser
modulation.
Then
we
demonstrated
Yb-doped
fiber
based
on
VP-deposited
taper-shaped
(TSF)
SA,
delivers
stable
Q-switched
mode-locked
(QSML)
pulses,
dual-wavelength
pulses
404-fs
noise-like
pulses.
This
work
fully
demonstrates
great
potential
materials
pulse
generation.
