of 3
Supplementary Materials for
Octave-spanning tunable infrared parametric oscillators in nanophotonics
Luis
Ledezma
et al.
Corresponding author: Alireza Marandi, marandi@caltech.edu
Sci. Adv.
9
, eadf9711 (2023)
DOI: 10.1126/sciadv.adf9711
This PDF file includes:
Figs. S1 and S2
Fig. S1.
Doubly
-
resonant OPO Design.
a
, Simulated coupling factor of adiabatic couplers used
to create the OPO resonator.
b
, Simulated mode profiles for a representative set of pump, signal,
and idler wavelengths, illustrating their similarities despite the large frequency difference leading
to a substantial mode overlap over wide bandwidth.
c
-
f
, Two examples of OPOs with different
geometries, showing the effect of dispersion engineering on the tuning curves.
c,d
Correspond to
an OPO that could be pumped with femtosecond pulses for frequency
comb generation in the
mid
-
infrared.
e,f
Correspond to the OPOs described in the main text, exhibiting a smooth tuning
characteristic.
d,f
Parametric gain as a function of signal (and idler) frequency for fixed pump
wavelengths indicated by the vertical li
nes in
c,e
.
Fig. S2
.
Doubly
-
resonant and singly resonant regimes.
a
, Detected OPO signal for low pump
power showing isolated oscillation peaks. This phenomenon, known as cluster effects in doubly
-
resonant OPOs (DROs), is due to the difference between the free spectral range at signal and
idler wavelengths produced by wa
veguide dispersion.
b
, At larger pump powers the OPO
oscillates for any pump wavelength. This is because away from a doubly
-
resonant cluster, the
OPO operates closer to the singly resonant regime, with a strongly resonant idler and a weakly
resonant signal
that is free to adjust itself to a frequency
=
. In both,
a
and
b
, signal
power variations are due to a combination of threshold variations and wavelength dependent
pump laser power.