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We demonstrate dispersion control in optical resonators over an octave of optical bandwidth. Dispersion is engineered lithographically and Q factor is maintained above 100 million, which is critical for efficient nonlinear devices such as microcombs.
We demonstrate a Brillouin microcavity laser based on a microrod resonator exhibiting a frequency noise of 140 Ηζ/√Hz at 10 Hz offset. The corresponding laser linewidth is measured to be below 400 Hz.
Optical frequency division and stable microwave generation is demonstrated using an electro-optical-based frequency comb created through phase modulation of two stable optical signals. The technique is simple, tunable and scalable to higher division ratios.
A low-loss silica spiral waveguide is used for demonstrating on-chip supercontinuum generation. The broadest measured spectrum spans an octave (936 – 1888 nm) at −50 dB from peak when 2.17 nJ pulses are launched.
High-Q performance in microcavities relies upon use of low absorption dielectrics and creation of smooth dielectric interfaces. For chip-compatible devices, silica has the lowest intrinsic material loss [1]. Microtoroid resonators combine this low material loss with a reflow technique in which surface tension is used to smooth lithographic and etch-related blemishes [2]. At the same time, reflow smoothing...
Using a wet etch process, optical resonators with quality factor as high as 875 million are demonstrated. These silicon-chip-based devices are fabricated without reflow, thereby expanding the range of integration opportunities and possible applications.
We demonstrate the detection of single protein molecules in an aqueous environment with an Yb-doped silica microlaser. With the employment of a real-time spectrum analyzer, a fast sampling speed of sub-milliseconds per spectrum was adopted.
We investigate how thermal stress impacts silica disk resonators by comparing measurements with a finite element and an analytical model. Thicker oxide layers and proper control of undercut enable ultrahigh optical performance and mechanical stability.
We propose a variational approach to design adiabatic waveguide connections with minimal intermodal coupling. A design of the “S-bend” of whispering-gallery spiral waveguides is demonstrated with approximately 0.05 dB insertion loss.
High-Q disk resonators are used to frequency stabilize two fiber lasers. The improved phase noise of the devices is measured by heterodyne detection and compared to theoretical limits set by thermo-refractive noise.
An on-chip Brillouin microwave source is demonstrated. Phase noise of −106 dBc/Hz at 100kHz offset frequency (21.6 GHz carrier signal) is measured. A record low white phase noise floor for a microcavity-based source is demonstrated.
A monolithic, 27-meter long waveguide having optical loss of less than 0.1dB/m is demonstrated. The same process produces resonators having Q factors as high as 875 million. Applications are reviewed.
Optical resonators with quality factor as high as 875 million are demonstrated. These silicon-chip-based devices are fabricated using only lithography and chemical etching, thereby expanding integration opportunities and possible applications.
Optical resonators with Q values of nearly 1 billion are demonstrated, the highest for any chip-based devices. Fabrication uses only standard semiconductor processes, enabling precise size control and access to microwave-rate free-spectral-range operation.
The first chip-based stimulated Brillouin laser (SBL) is demonstrated. It has efficiency of 90% and exhibits record coherence for an on-chip device, featuring Schawlow-Townes frequency noise of 60 milliHz2/Hz. Low technical noise is also observed.
We report the detection of 11.5-nm radius polystyrene beads in an aqueous environment at a signal-to-noise-ratio of 18:1 by monitoring the split frequency steps of a 5.7-KHz-linewidth microlaser. The thermal-optical effect is also observed.
Using a wet etch process, 27 meter long waveguides having optical loss of less than 0.1dB/m are demonstrated. Resonator measurements show that this loss value can be reduced to 0.037 dB/m
A silicon-chip microcomb accessing the important microwave-rate FSR range is reported. A broadband microcomb with rep rate 33GHz and span 66THz is shown with pump power of 200mW. Microcombs with rep rates ranging from 132GHz to 2.6GHz are demonstrated.
Using a wet etch process, 7 meter long waveguides having optical loss of 0.055dB/m are demonstrated. The same process produces resonators having Q factors as high as 750 million. Applications to microwave photonics are reviewed.
Optical resonators with quality factor as high as 750 million are demonstrated. These silicon-chip-based devices are fabricated without silica reflow, thereby expanding the range of integration opportunities and possible applications.
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