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The Planet Formation Imager (PFI, www.planetformationimager.org) is a next-generation infrared interferometer array with the primary goal of imaging the active phases of planet formation in nearby star forming regions. PFI will be sensitive to warm dust emission using mid-infrared capabilities made possible by precise fringe tracking in the near-infrared. An L/M band combiner will be especially sensitive...
Dispersive-wave scattering from dissipative Kerr solitons is induced by spatial-mode interactions within a high-Q micro-resonator. A limiting case, single-mode dispersive waves, are observed and their interaction with the soliton causes hysteretic behavior.
We demonstrate a frequency-stabilized, dual-Kerr microcomb that guides an integrated Vernier-laser optical frequency synthesizer, all derived from an RF clock. The synthesizer's stability is <10−12/τ with Hz-level tuning resolution across a 32 nm tuning range.
A 30 G Hz ultra-low-phase-noise oscillator is demonstrated u sing electro-optical frequency di vision. The measured phase noise is −151 dBc/Hz (10 kHz offset) and −109 dBc/Hz (100 Hz offset). Phase locking to an external reference for long term synchronization is also demonstrated.
We report the generation of ultra-low phase noise microwave signals using electro-optical frequency division. Two, independent 30 GHz eOFD oscillators are constructed and the measured phase noise for each oscillator is −151 dBc/Hz at 10 kHz offset and −109 dBc/Hz at 100 Hz offset. Phase locking to an external reference for long term synchronization is also demonstrated.
We introduce an architecture for optical-frequency synthesis using photonic-chip frequency combs and a heterogeneously integrated CW laser. The Kerr dual-comb that we describe offers a microwave-optical link to discipline the laser to an RF clock.
Temporal cavity solitons with a detectable repetition rate are generated in a high-Q silica microresonator. A technique for long-term stabilization of the soliton train is demonstrated and used to measure soliton properties for comparison with theory.
A monolithic micro cavity is used to detect rotations as low as 22 degrees/hour using counter-propagating laser fields. The proof-of-concept gyroscope features an 18mm silica-on-silicon disk resonator with an intrinsic Q factor over 200 million. Cascaded stimulated Brillouin lasing action produces the laser fields.
Like a tuning fork for light, optical resonators have a characteristic set of frequencies at which it is possible to confine light waves. At these frequencies, optical energy can be efficiently stored for lengths of time characterized by the resonator Q factor, roughly the storage time in cycles of oscillation. In the last ten years there has been remarkable progress in boosting this storage time...
Optical frequency division based on mode-locked laser frequency combs makes possible the coherent transfer of frequency stability from optical systems to electronics. It has enabled a revolution in time keeping and frequency metrology. In this paper we describe progress on new methods for frequency comb generation including whispering-gallery-based microcombs and electro-optical comb generation. Demonstration...
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.
Laser-microcavity relative frequency fluctuations caused by thermal locking are studied. The locking of laser-microcavity detuning causes microcavity temperature fluctuations that transfer pump frequency noise onto the microcavity modes within the thermal locking bandwidth.
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.
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.
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