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Sub-Hz fundamental, sub-kHz integral linewidth self-injection locked 780 nm hybrid integrated laser.
Sci Rep
November 2024
Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA, 93106, USA.
Today's precision experiments for timekeeping, inertial sensing, and fundamental science place strict requirements on the spectral distribution of laser frequency noise. Rubidium-based experiments utilize table-top 780 nm laser systems for high-performance clocks, gravity sensors, and quantum gates. Wafer-scale integration of these lasers is critical for enabling systems-on-chip.
View Article and Find Full Text PDFHigh-power quantum-limited 35 MHz photodiode and classical laser noise suppression.
Rev Sci Instrum
December 2023
Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada.
To benefit high-power interferometry and the creation of low-noise light sources, we develop a simple lead-compensated photodetector enabling quantum-limited readout from 0.3 to 10 mW and 10 kΩ gain from 85 Hz to 35 MHz, with a noise equivalent power of 9 pW/Hz. Feeding the detector output back to an intensity modulator, we suppress the classical amplitude noise of a commercial 1550 nm fiber laser to the shot noise limit over a bandwidth of 700 Hz-200 kHz, observing no degradation to its (nominally ∼100 Hz) linewidth.
View Article and Find Full Text PDFOptical frequency combs based on fiber lasers mode-locked (ML) with a nonlinear amplifying loop mirror (NALM) have become the backbone of many cutting-edge applications, ranging from precision spectroscopy to quantum physics. Being extremely precise measurement tools, understanding their passive stability and low-noise operation regimes is vital. While several influences on the laser noise have been studied, many parameters remain poorly understood.
View Article and Find Full Text PDFNoise Suppression of Nitrogen-Vacancy Magnetometer in Lock-In Detection Method by Using Common Mode Rejection.
Micromachines (Basel)
September 2023
State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, China.
Nitrogen-vacancy (NV) centers in diamonds are promising solid-state magnetic sensors with potential applications in power systems, geomagnetic navigation, and diamond NV color center current transformers, in which both high bandwidth and high magnetic field resolution are required. The wide bandwidth requirement often necessitates high laser power, but this induces significant laser fluctuation noise that affects the detection magnetic field resolution severely. Therefore, enhancement of the magnetic field resolution of wide-bandwidth NV center magnetic sensors is highly important because of the reciprocal effects of the bandwidth and magnetic field resolution.
View Article and Find Full Text PDFQuantum sensing for gravity cartography.
Nature
February 2022
Midlands Ultracold Atom Research Centre, School of Physics and Astronomy, University of Birmingham, Birmingham, UK.
Article Synopsis
- A new quantum gravity gradient sensor has been developed to improve the precision of gravity measurements in geophysics, particularly for applications in engineering and climate research.
- The sensor significantly reduces vibrational noise and achieves high statistical accuracy, allowing for detailed underground surveys, such as detecting a 2-meter tunnel with a high signal-to-noise ratio.
- Its capabilities can be applied to diverse fields, including aquifer mapping, archaeology, soil property analysis, and assessing construction site conditions, enhancing our understanding of subsurface features.
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