Abstract: An on-chip laser includes a gain portion, a mirror in communication with the gain portion, a waveguide in communication with the gain portion, and a resonator optically coupled to the waveguide at an optical coupling. The resonator has a circular shape. The waveguide and the resonator are separate from the gain portion.

Abstract: A method of providing optical coherence tomography (OCT) imaging may comprise using an on-chip frequency comb source interfaced with an OCT system by a circulator as an imaging source and reconstructing OCT images from resulting spectral data from target tissue illuminated by the imaging source.

Abstract: Systems, methods, devices, and apparatuses generate a fully integrated broadband high power frequency combs, based on a multimode gain chip. Embodiments can generate a frequency comb spanning over ˜150 nm and include self-injection locking of a multimode chip-based gain, which can allow access to high pump power while maintaining single mode operation. The integrated frequency comb systems and methods can comprise a multimode gain chip, a ring resonator in optical communication with a waveguide and, and an integrated heater in thermal communication with the ring resonator. Embodiments can be configured to receive multimode gain input and effect a single-mode ring feedback to determine a target mode. A temperature of the ring resonator can be optionally adjusted to modulate the ring feedback, and the ring feedback can be applied to the multimode gain input to generate an output frequency comb that includes the target mode.

Abstract: Methods, systems, and devices for light emission are disclosed. An example device may comprise an optical source configured to output light, a waveguide optically coupled to the optical source and configured to carry the light, and a feedback portion configured to reflect the light back to the optical source via the waveguide. The feedback portion may comprise a microresonator optically coupled to the waveguide. The device may comprise one or more tuning elements configured to tune one or more of the microresonator or the waveguide to cause constructive interference between the reflected light and light of the optical source, resulting in optical emission of both the reflected light and the light of the optical source from an end of the waveguide.

Abstract: Methods, systems, and devices are described for generating an optical signal. An example device may comprise a chip and a waveguide disposed on the chip and comprising silicon nitride. The waveguide may be configured to generate, based on nonlinear effects applied to a pump signal from a pump laser, an optical signal having a broader spectrum than the pump signal. The waveguide may have a width and a height such that the optical signal has near zero group-velocity-dispersion.

Abstract: A method of providing optical coherence tomography (OCT) imaging may comprise using an on-chip frequency comb source interfaced with an OCT system by a circulator as an imaging source and reconstructing OCT images from resulting spectral data from target tissue illuminated by the imaging source.

Abstract: Disclosed are devices, methods, and systems for controlling output of a laser. An example device can comprise a first portion comprising a gain element and a second portion comprising a silicon material. The second portion can comprise a waveguide configured to receive light from the gain element, an optical resonator configured to at least partially reflect light back to the gain element via the waveguide, and a first tuning element configured to tune a resonant frequency of the optical resonator.

Abstract: Optical frequency combs and related methods, devices, and systems are described. An example device can comprise a waveguide configured to optically couple to an optical source and at least one optical resonator optically coupled to the waveguide. The one or more of the at least one optical resonator can be tuned such that an optical frequency comb is generated based on mode interaction between two different modes of the at least one optical resonator. The device can comprise an output coupled to the waveguide and configured to output the optical frequency comb.

Abstract: A method of providing optical coherence tomography (OCT) imaging may comprise using an on-chip frequency comb source interfaced with an OCT system by a circulator as an imaging source and reconstructing OCT images from resulting spectral data from target tissue illuminated by the imaging source.

Abstract: A method of providing optical coherence tomography (OCT) imaging may comprise using an on-chip frequency comb source interfaced with an OCT system by a circulator as an imaging source and reconstructing OCT images from resulting spectral data from target tissue illuminated by the imaging source.

Abstract: Example methods, devices, and systems for optical emission are disclosed. An example device can comprise one or more optical filters. The one or more optical filters can be configured to be coupled to an optical amplifier. The device can comprise a microresonator configured to receive an output of the one or more optical filters and output, based on parametric multiwave mixing, a frequency comb. The one or more optical filters and the microresonator can be integrated into a single chip.

Abstract: An on-chip laser includes a gain portion, a mirror in communication with the gain portion, a waveguide in communication with the gain portion, and a resonator optically coupled to the waveguide at an optical coupling. The resonator has a circular shape. The waveguide and the resonator are separate from the gain portion.

Abstract: Provided are devices that have a distal portion configured to be implanted in a brain of a subject. The distal portion includes one or more emitters configured to emit light in the visible spectrum. The device includes a proximal portion configured to be external to the brain of the subject while the distal portion is implanted, wherein the proximal portion includes at least one waveguide in optical communication with the one or more emitters. The at least one waveguide defines a cross-sectional width less than 500 nm. The at least one waveguide is optionally coupled to a heating element that is optionally configured to adjust a phase of light within the at least one waveguide.