Optics Letters,
Journal Year:
2023,
Volume and Issue:
49(2), P. 391 - 391
Published: Dec. 8, 2023
High-quality
micro-resonators
on
thin-film
lithium
niobate
(TFLN)
have
emerged
as
an
ideal
platform
for
on-chip
nonlinear
optical
applications
due
to
their
strong
light
confinement
and
excellent
natural
properties.
Here,
we
present
high-efficiency
second-harmonic
generation
(SHG)
in
a
TFLN
based
the
modal
phase
matching
quasi-phase
matching.
By
optimizing
phase-matching
conditions
through
thermal
tuning,
demonstrate
SHG
efficiency
of
149,000%/W
low
power
regime.
Furthermore,
achieve
absolute
conversion
10.3%
with
0.3
mW
pump
power.
Our
work
paves
way
toward
future
efficient
frequency
classical
quantum
without
need
poling
LN
films.
Applied Physics Letters,
Journal Year:
2023,
Volume and Issue:
122(8)
Published: Feb. 20, 2023
Thin-film
lithium
niobate
(TFLN)
photonic
integrated
circuits
(PICs)
have
emerged
as
a
promising
photonics
platform
for
the
optical
communication,
microwave
photonics,
and
sensing
applications.
In
recent
years,
rapid
progress
has
been
made
on
development
of
low-loss
TFLN
waveguides,
high-speed
modulators,
various
passive
components.
However,
integration
laser
sources
is
still
one
main
hurdles
in
path
toward
fully
PICs.
Here,
we
present
heterogeneous
InP-based
semiconductor
lasers
PIC.
The
III–V
epitaxial
layer
stack
adhesively
bonded
to
waveguide
circuit.
device,
light
coupled
from
gain
section
via
multi-section
spot
size
converter.
A
waveguide-coupled
output
power
above
1
mW
achieved
device
operating
at
room
temperature.
This
approach
can
also
be
used
realize
on-chip
photodetectors
based
same
process
flow,
thereby
enabling
large-volume,
low-cost
manufacturing
III–V-on-lithium
systems
next-generation
high-capacity
communication
APL Photonics,
Journal Year:
2023,
Volume and Issue:
8(9)
Published: Sept. 1, 2023
Femtosecond
(Fs)
laser
micro-/nano-fabrication
technology
allows
direct
definition
of
on-demand
nanostructures
with
three-dimensional
(3D)
geometric
features
and
tailored
photonic
functionalities
in
a
facile
manner.
In
addition,
such
strategy
is
widely
applicable
to
various
material
families,
including
dielectrics,
semiconductors,
metals.
Based
on
diverse
dielectric
crystals,
fs-laser
writing
optical
waveguides
flexible
geometries
functional
waveguide-based
devices
have
been
well-developed.
Beyond
waveguide
architectures,
the
combination
3D
nanofabrication
fs
lasers
multi-functionalities
crystals
has
also
lighted
up
future
development
novel
structures
even
beyond
diffraction
limit.
this
article,
promising
research
topics
domain
engineering
for
nonlinear
optics,
color
centers
integrated
quantum
photonics,
surface
processing
photonics
enabled
by
are
briefly
overviewed.
We
highlight
recent
progress
these
stress
importance
aberration
correction
during
fabrication,
followed
discussion
challenges
foreseeing
defined
toward
multi-functional
photonics.
Optics Letters,
Journal Year:
2023,
Volume and Issue:
48(10), P. 2660 - 2660
Published: March 3, 2023
We
demonstrate
an
on-chip
single-mode
Er3+-doped
thin-film
lithium
niobate
(Er:TFLN)
laser
which
consists
of
a
Fabry-Perot
(FP)
resonator
based
on
Sagnac
loop
reflectors
(SLRs).
The
fabricated
Er:TFLN
has
footprint
6.5
mm
×
1.5
with
loaded
quality
(Q)
factor
1.6
105
and
free
spectral
range
(FSR)
63
pm.
generate
the
at
1544
nm
wavelength
maximum
output
power
44.7
µW
slope
efficiency
0.18%.
Abstract
An
optical
quantum
memory
is
a
device
that
can
store
photonic
information
and
release
it
after
controlled
time.
It
an
essential
component
for
overcoming
channel
losses
in
large‐scale
networks.
Optical
memories
have
been
demonstrated
with
various
physical
systems
including
atomic
gases,
single
atoms
cavities,
rare‐earth‐ion
doped
solids.
Now,
are
marching
toward
miniaturization
integration
practical
applications.
Solid
state
stand
as
natural
choice
due
to
the
stability
ease
of
micro
or
nano
fabrication
using
well‐established
techniques.
In
past
decade,
considerable
efforts
devoted
developing
integrated
memories,
is,
based
on
micro/nano‐photonic
structures
manufactured
Remarkable
performances
achieved
advantages
lower
laser/electric
power
requirements,
small
volumes,
large
storage
densities,
easy
implementations.
this
article,
basic
concepts
state‐of‐the‐art
technologies
fabricating
rare‐earth
ions
crystals,
recent
advances
introduced,
roadmap
practically
useful
devices
applications
networks
discussed.
Abstract
This
work
demonstrates
a
robust
low‐loss
optical
interface
by
tiling
passive
(i.e.,
without
doping
of
active
ions)
thin
film
lithium
niobate
(TFLN)
and
doped
with
rare
earth
TFLN
substrates
for
monolithic
integration
passive/active
photonics.
The
tiled
composed
both
areas
allow
patterning
the
mask
integrated
photonic
device
at
once
using
single
continuous
photolithography
process.
loss
substrate
is
measured
as
low
0.26
dB.
Thanks
to
stability
provided
this
approach,
four‐channel
waveguide
amplifier
realized
in
straightforward
manner,
which
shows
net
gain
5
dB
1550‐nm
wavelength
8
1530‐nm
each
channel.
will
facilitate
large‐scale
high
performance
devices
that
require
on‐chip
light
sources
amplifiers.
Abstract
Photonic‐based
low‐phase‐noise
microwave
generation
with
real‐time
frequency
tuning
is
crucial
for
a
broad
spectrum
of
subjects,
including
next‐generation
wireless
communications,
radar,
metrology,
and
modern
instrumentation.
Here,
the
first
time
to
best
authors’
knowledge,
narrow‐bandwidth
dual‐wavelength
microlasers
are
generated
from
nearly‐degenerate
polygon
modes
in
high‐Q
active
lithium
niobate
microdisk.
The
record‐high‐Q
(≈10
7
)
formation
independently
controllable
resonant
wavelengths
free
spectral
ranges
enabled
by
weak
perturbation
microdisks
using
tapered
fiber.
Moreover,
because
high
spatial
overlap
factor
between
pump
laser
achieved,
gain
competition
two
lasing
spatially
separated
π‐phase
difference
suppressed,
leading
stable
low
threshold,
turn,
noise
source.
beating
signal
confirms
phase‐noise
achieved
tunable
laser.
Without
need
external
phase
stabilizers,
measured
shows
−123
dBc
Hz
−1
an
electro‐optic
efficiency
−1.66
MHz
V
.
linewidth
as
6.87
kHz,
which
more
than
three
orders
magnitude
narrower
current
records
based
on
integrated
dual‐lasers.
ACS Photonics,
Journal Year:
2024,
Volume and Issue:
11(5), P. 2114 - 2122
Published: April 18, 2024
A
light
source
is
an
indispensable
component
in
on-chip
systems.
Compared
with
hybrid
or
heterogeneous
integrated
laser,
monolithically
laser
more
suitable
for
high-density
photonic
circuits
because
of
the
capability
large-scale
manufacturing,
lower
active-passive
coupling
loss,
and
less
test
complexity.
Recent
years
have
seen
spark
research
on
rare-earth
ion-doped
thin
film
lithium
niobate,
demonstrations
been
made
both
classical
quantum
chips.
However,
low
output
power
limited
emitting
efficiency
hinder
application
chip-scale
based
this
platform.
Here
a
highly
efficient
assisted
by
amplifier
proposed
experimentally
prepared
Erbium-doped
niobate.
slope
0.43%
linewidth
47.86
kHz
are
obtained.
The
maximum
7.989
μW.
Our
results
show
viable
solution
to
improve
without
changing
intrinsic
material,
our
design
has
potential
applications
being
incorporated
functional
devices
such
as
optical
communications,
memory,
emission.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Sept. 16, 2024
Femtosecond
laser
pulses
enable
the
synthesis
of
light
across
electromagnetic
spectrum
and
provide
access
to
ultrafast
phenomena
in
physics,
biology,
chemistry.
Chip-integration
femtosecond
technology
could
revolutionize
applications
such
as
point-of-care
diagnostics,
bio-medical
imaging,
portable
chemical
sensing,
or
autonomous
navigation.
However,
current
chip-integrated
pulse
sources
lack
required
peak
power,
on-chip
amplification
has
been
an
unresolved
challenge.
Here,
addressing
this
challenge,
we
report
>50-fold
1
GHz-repetition-rate
chirped
a
CMOS-compatible
photonic
chip
800
W
power
with
116
fs
duration.
This
level
is
2-3
orders
magnitude
higher
compared
those
previously
demonstrated
can
needed
address
key
applications.
To
achieve
this,
detrimental
nonlinear
effects
are
mitigated
through
all-normal
dispersion,
large
mode-area
rare-earth-doped
gain
waveguides.
These
results
offer
pathway
levels
characteristic
table-top
sources.
