Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(7), P. 3813 - 3813
Published: March 31, 2025
Single-longitudinal
mode
lasers
are
widely
used
as
light
sources
in
coherent
lidars
due
to
their
narrow
linewidth
and
long
coherence
length.
However,
we
observed
spontaneous
frequency
drift
a
single-longitudinal
laser,
accompanied
by
the
oscillation
of
second
mode,
which
could
compromise
laser’s
performance.
In
this
study,
recorded
resulting
power
fluctuations.
By
analyzing
centroid
positions
laser
spot,
confirmed
that
originated
from
changes
optical
path
To
address
issue,
designed
an
electro-optic
Fabry–Perot
etalon.
When
400
V
voltage
was
applied,
returned
operation
within
15
s.
The
etalon
induced
variation
0.05
μm.
This
work
provides
new
insights
into
application
crystals
for
stabilizing
frequencies.
Chinese Optics Letters,
Journal Year:
2024,
Volume and Issue:
22(4), P. 041301 - 041301
Published: Jan. 1, 2024
We
demonstrate
single-mode
microdisk
lasers
in
the
telecom
band
with
ultralow
thresholds
on
erbium-ytterbium
co-doped
thin-film
lithium
niobate
(TFLN).
The
active
was
fabricated
high-Q
factors
by
photolithography-assisted
chemomechanical
etching.
Thanks
to
co-doping
providing
high
optical
gain,
loss
nanostructuring,
and
excitation
of
coherent
polygon
modes,
which
suppresses
multimode
lasing
allows
spatial
mode
overlap
between
pump
laser
emission
operating
at
1530
nm
wavelength
observed
an
threshold,
under
a
980-nm-band
pump.
threshold
measured
as
low
1
µW,
is
one
order
magnitude
smaller
than
best
results
previously
reported
TFLN
microlasers.
conversion
efficiency
reaches
4.06
×
10-3,
also
highest
value
Optics Express,
Journal Year:
2023,
Volume and Issue:
31(4), P. 5951 - 5951
Published: Jan. 23, 2023
Throughout
the
development
of
single
frequency
fiber
lasers
(SFFLs),
gain
is
one
most
important
components,
which
can
greatly
affect
quality
SFFLs.
Here,
we
fabricated
an
Er:
YAG
crystal-derived
silica
(EYDSF)
using
a
CO2
laser-heating
drawing
technique,
with
high
coefficient
1.74
dB/cm.
Employing
EYDSF
only
10
cm
as
medium,
constructed
continuous-wave
ring-cavity
SFFL
all-fiber
system.
An
ultra-narrow
linewidth
<660
Hz
was
achieved
harnessing
homemade
low-concentration
Er-doped
saturable
absorber.
Importantly,
output
power
up
to
32.7
mW
at
1560
nm.
What's
more,
no
multi
longitudinal
mode
or
hopping
were
found
in
2
hours,
and
fluctuation
<0.63%
8
hours.
Furthermore,
relative
intensity
noise
lower
-145
dB/Hz
frequencies
over
1
MHz.
The
results
indicate
that
has
desirable
performance
power,
linewidth,
stability
noise,
serves
prospective
candidate
applied
coherent
optical
communications,
high-precision
sensors,
laser
radars
other
advanced
fields.
Optics Letters,
Journal Year:
2023,
Volume and Issue:
48(13), P. 3367 - 3367
Published: May 25, 2023
Lithium
niobate-on-insulator
(LNOI)
is
a
promising
integration
platform
for
various
applications,
such
as
optical
communication,
microwave
photonics,
and
nonlinear
optics.
To
make
niobate
(LN)
photonic
integrated
circuits
(PICs)
more
practical,
low-loss
fiber–chip
coupling
essential.
In
this
Letter,
we
propose
experimentally
demonstrate
silicon
nitride
(SiN)
assisted
tri-layer
edge
coupler
on
LNOI
platform.
The
consists
of
bilayer
LN
taper
an
interlayer
structure
composed
80
nm-thick
SiN
waveguide
strip
waveguide.
measured
loss
the
TE
mode
0.75
dB/facet
at
1550
nm.
Transition
between
∼0.15
dB.
addition,
fabrication
tolerance
in
high.
Optics Letters,
Journal Year:
2025,
Volume and Issue:
50(7), P. 2370 - 2370
Published: Feb. 24, 2025
We
demonstrated
an
integrated
high-Q
cascaded
Fabry-Perot
(FP)
resonator
on
lithium
niobate
insulator
(LNOI)
implemented
by
multi-Sagnac
loop
reflectors,
which
was
fabricated
femtosecond
laser
photolithography-assisted
chemo-mechanical
polishing
(CMP).
Compared
with
the
that
comprised
only
two
Sagnac
reflectors
(SLRs),
there
is
a
significant
Q
factor
enhancement
in
formed
multi-SLRs.
The
loaded
of
measured
to
be
1.16
×
106,
five-fold
improvement
compared
state
art
same
material
platform.
Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(7), P. 3813 - 3813
Published: March 31, 2025
Single-longitudinal
mode
lasers
are
widely
used
as
light
sources
in
coherent
lidars
due
to
their
narrow
linewidth
and
long
coherence
length.
However,
we
observed
spontaneous
frequency
drift
a
single-longitudinal
laser,
accompanied
by
the
oscillation
of
second
mode,
which
could
compromise
laser’s
performance.
In
this
study,
recorded
resulting
power
fluctuations.
By
analyzing
centroid
positions
laser
spot,
confirmed
that
originated
from
changes
optical
path
To
address
issue,
designed
an
electro-optic
Fabry–Perot
etalon.
When
400
V
voltage
was
applied,
returned
operation
within
15
s.
The
etalon
induced
variation
0.05
μm.
This
work
provides
new
insights
into
application
crystals
for
stabilizing
frequencies.
