scholarly journals Fundamental optical linewidth of soliton microcombs

2021 ◽  
Author(s):  
Fuchuan Lei ◽  
Zhichao Ye ◽  
Attila Fülöp ◽  
Victor Torres-Company
Keyword(s):  
Frequency Shift ◽  
Phase Noise ◽  
Phase Coherence ◽  
Pump Laser ◽  
Frequency Noise ◽  
Coherent Light ◽  
Optical Phase ◽  
New Strategy ◽  
Precision Metrology ◽  
On Chip

Abstract Soliton microcombs provide a versatile platform for realizing fundamental studies and technological applications. To be utilized as frequency rulers for precision metrology, soliton microcombs must display broadband phase coherence, a parameter characterized by the optical phase or frequency noise of the comb lines and their corresponding optical linewidths. Here, we analyze the optical phase-noise dynamics in soliton microcombs and show that, because of the Raman self-frequency shift, the fundamental linewidth of some of the comb lines can, surprisingly, be narrower than the linewidth of the pump laser. This work elucidates information about the ultimate limits in phase coherence of soliton microcombs and illustrates a new strategy for the generation of spectrally coherent light on chip.

scholarly journals Avoiding transduction-induced heating in suspended microchannel resonators using piezoelectricity

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Damien Maillard ◽  
Annalisa De Pastina ◽  
Amir Musa Abazari ◽  
Luis Guillermo Villanueva
Keyword(s):  
Resonance Frequency ◽  
Frequency Shift ◽  
Laser Doppler Vibrometer ◽  
Laser Source ◽  
Frequency Noise ◽  
Resonance Frequency Shift ◽  
Suspended Microchannel Resonators ◽  
On Chip ◽  
Biological Entities ◽  
Microchannel Resonators

AbstractCalorimetry of single biological entities remains elusive. Suspended microchannel resonators (SMRs) offer excellent performance for real-time detection of various analytes and could hold the key to unlocking pico-calorimetry experiments. However, the typical readout techniques for SMRs are optical-based, and significant heat is dissipated in the sensor, altering the measurement and worsening the frequency noise. In this manuscript, we demonstrate for the first time full on-chip piezoelectric transduction of SMRs on which we focus a laser Doppler vibrometer to analyze its effect. We demonstrate that suddenly applying the laser to a water-filled SMR causes a resonance frequency shift, which we attribute to a local increase in temperature. When the procedure is repeated at increasing flow rates, the resonance frequency shift diminishes, indicating that convection plays an important role in cooling down the device and dissipating the heat induced by the laser. We also show that the frequency stability of the device is degraded by the laser source. In comparison to an optical readout scheme, a low-dissipative transduction method such as piezoelectricity shows greater potential to capture the thermal properties of single entities.

scholarly journals Pulse Timing Jitter Estimated From Optical Phase Noise in Mode-Locked Semiconductor Quantum Dash Lasers

2020 ◽  
Vol 38 (17) ◽  
pp. 4787-4793 ◽  
Author(s):  
Youxin Mao ◽  
Zhenguo Lu ◽  
Jiaren Liu ◽  
Philip J. Poole ◽  
Guocheng Liu
Keyword(s):  
Phase Noise ◽  
Timing Jitter ◽  
Optical Phase ◽  
Quantum Dash ◽  
Pulse Timing

scholarly journals Dynamical decoupling of laser phase noise in compound atomic clocks

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Sören Dörscher ◽  
Ali Al-Masoudi ◽  
Marcin Bober ◽  
Roman Schwarz ◽  
Richard Hobson ◽  
...  
Keyword(s):  
Phase Noise ◽  
Phase Measurement ◽  
Local Oscillator ◽  
Frequency Instability ◽  
Laser Frequency ◽  
High Signal ◽  
Frequency Noise ◽  
Atomic Clocks ◽  
Dynamical Decoupling ◽  
Measurement Protocol

Abstract The frequency stability of many optical atomic clocks is limited by the coherence of their local oscillator. Here, we present a measurement protocol that overcomes the laser coherence limit. It relies on engineered dynamical decoupling of laser phase noise and near-synchronous interrogation of two clocks. One clock coarsely tracks the laser phase using dynamical decoupling; the other refines this estimate using a high-resolution phase measurement. While the former needs to have a high signal-to-noise ratio, the latter clock may operate with any number of particles. The protocol effectively enables minute-long Ramsey interrogation for coherence times of few seconds as provided by the current best ultrastable laser systems. We demonstrate implementation of the protocol in a realistic proof-of-principle experiment, where we interrogate for 0.5 s at a laser coherence time of 77 ms. Here, a single lattice clock is used to emulate synchronous interrogation of two separate clocks in the presence of artificial laser frequency noise. We discuss the frequency instability of a single-ion clock that would result from using the protocol for stabilisation, under these conditions and for minute-long interrogation, and find expected instabilities of σy(τ) = 8 × 10−16(τ/s)−1/2 and σy(τ) = 5 × 10−17(τ/s)−1/2, respectively.

scholarly journals Plasmonic nanogap enhanced phase-change devices with dual electrical-optical functionality

2019 ◽  
Vol 5 (11) ◽  
pp. eaaw2687 ◽  
Author(s):  
Nikolaos Farmakidis ◽  
Nathan Youngblood ◽  
Xuan Li ◽  
James Tan ◽  
Jacob L. Swett ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Memory ◽  
Memory Cell ◽  
Communications Technologies ◽  
New Strategy ◽  
On Chip ◽  
Processing And Storage ◽  
Electrical Signaling ◽  
And Storage ◽  
Change Memory

Modern-day computers rely on electrical signaling for the processing and storage of data, which is bandwidth-limited and power hungry. This fact has long been realized in the communications field, where optical signaling is the norm. However, exploiting optical signaling in computing will require new on-chip devices that work seamlessly in both electrical and optical domains, without the need for repeated electrical-to-optical conversion. Phase-change devices can, in principle, provide such dual electrical-optical operation, but assimilating both functionalities into a single device has so far proved elusive owing to conflicting requirements of size-limited electrical switching and diffraction-limited optical response. Here, we combine plasmonics, photonics, and electronics to deliver an integrated phase-change memory cell that can be electrically or optically switched between binary or multilevel states. Crucially, this device can also be simultaneously read out both optically and electrically, offering a new strategy for merging computing and communications technologies.

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