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The fabrication processes of silicon nitride (Si3N4) photonic devices used in foundries require low temperature deposition, which typically leads to high propagation losses. Here, it is shown that propagation loss as low as 0.42 dB cm−1 can be achieved using foundry compatible processes by solely reducing waveguide surface roughness. By postprocessing the fabricated devices using rapid thermal anneal...
Low propagation loss in high confinement waveguides is critical for chip‐based nonlinear photonics applications. Sophisticated fabrication processes which yield sub‐nm roughness are generally needed to reduce scattering points at the waveguide interfaces to achieve ultralow propagation loss. Here, ultralow propagation loss is shown by shaping the mode using a highly multimode structure to reduce its...
We generate broadband soliton mode-locked dual combs on the same chip and demonstrate high SNR (> 40 dB) near-infrared dual-comb spectroscopy of dichloromethane over a 170 nm optical bandwidth with a short acquisition time of 20 μs.
We investigate competing effects of Raman and Kerr gain in diamond microresonators. Strong, narrowband Raman gain inherent in crystalline materials determines a maximum microresonator size allowable to achieve Kerr combs.
We predict that elliptically polarized beams undergoing multiple collapsing-defocusing cycles experience a loss of polarization and demonstrate this experimentally by measuring a large increase in fluctuations of nonlinear ellipse rotations for pulses undergoing filamention.
We demonstrate mode-hop-free tuning of a modelocked frequency comb over 60 GHz in a silicon microresonator. A gas-phase spectroscopy of acetylene is performed with a high-spectral-resolution (< 80 MHz) over a bandwidth of 40 THz.
We theoretically show the possibility of generating a coherent, octave-spanning supercontinuum with >1-ps pulses. Our proof-of-principle experiments demonstrate the feasibility of utilizing long waveguides and multiple cross sections for supercontinuum generation at ultralow pulse energies.
We demonstrate that silicon photonics can be leveraged for nonlinear optics in the mid-infrared range from 3–6μm. We fabricate an air-clad microresonator with Q=1 million at 3.79μm wavelength and demonstrate 5.3mW parametric oscillation threshold power.
We demonstrate frequency comb generation in the visible optical spectrum via excitation of higher-order modes in silicon nitride microresonators. Anomalous group-velocity dispersion from the higher-order mode allows for broadband comb generation spanning 45 THz.
We demonstrate an all-optical quantum random number generator using a degenerate optical parametric oscillator in a silicon-nitride microresonator. We achieve a 2-MHz generation rate and verify the randomness using the NIST Statistical Test Suite.
We demonstrate telecom-to-near-visible frequency conversion, spanning over 181 THz (734 nm) via Bragg scattering four-wave mixing in a Rb vapor cell with a 0.15 % energy conversion efficiency at 1 mW pump power.
We show that soliton-modelocked silicon nitride microresonators are highly stable against external perturbations. Modelocking is maintained even for relatively large RMS pump-power noise and thermal shifts, which represents a key feature for potential applications.
We demonstrate frequency-degenerate optical parametric oscillation via four-wave mixing using dual pumps in a silicon-nitride microresonator. The system offers potential for realization of coherent optical computing and all-optical quantum random number generation.
We stabilize a frequency comb generated by supercontinuum from a Si3N4 microchip and compare it to that generated in silica photonic crystal fibers. For high effective nonlinearities, spontaneous Raman scattering in silica can significantly degrade the supercontinuum coherence.
We demonstrate a microresonator-based dual-comb source. Operation is achieved in the mid-infrared with a single continuous-wave pump source using two silicon microresonators that are each modelocked using thermal control and free-carrier injection.
We investigate pulse propagation from the ultraviolet to the mid-infrared in gas-filled capillaries. For shorter wavelength pulses and smaller capillary diameters, ionization-induced refraction excites higher-order modes, and their constructive interference leads to spatio-temporal localization.
Using a diamond scheme in warm Rb-vapor, we generate quantum-correlated photon-pairs by spontaneous four-wave mixing. Using a Rb-filled photonic-band gap fiber, this system could achieve pair generation efficiencies of 10−3 pairs/input photon.
We demonstrate a low-loss fully-air-clad suspended silicon platform for mid-infrared photonics. We fabricate a suspended microring resonator with a high quality factor of 83,000 at 3.79 μm wavelength and suspended nanotapers using etchless waveguide processing.
We demonstrate on-chip dual frequency comb generation from cascaded silicon-nitride microresonators pumped by a single laser. We study the RF beatnotes between these combs as a step towards dual-comb spectroscopy and microwave signal synthesis.
We report the first demonstration of thermally-controlled single-soliton modelocking in silicon-nitride microresonators. With the pump frequency fixed, we use only current control with on-chip integrated heaters to demonstrate a systematic pathway for achieving single-soliton modelocking.
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