Results 21 to 30 of about 124,588 (288)
Results in Physics, 2023 Atom interferometry-based sensors have demonstrated remarkable precision, making them attractive for diverse applications compared to traditional sensors. However, practical experiments inevitably encounter noise, which limits precision.
Huai-Yu Zhu +3 more
doaj +1 more source
A New Bound on Excess Frequency Noise in Second Harmonic Generation in PPKTP at the 10^-19 Level [PDF]
, 2012 We report a bound on the relative frequency fluctuations in nonlinear second harmonic generation. A 1064nm Nd:YAG laser is used to read out the phase of a Mach-Zehnder interferometer while PPKTP, a nonlinear crystal, is placed in each arm to generate ...
Armstrong +17 more
core +2 more sources
Locking Local Oscillator Phase to the Atomic Phase via Weak Measurement [PDF]
, 2012 We propose a new method to reduce the frequency noise of a Local Oscillator (LO) to the level of white phase noise by maintaining (not destroying by projective measurement) the coherence of the ensemble pseudo-spin of atoms over many measurement cycles ...
Dehmelt H +6 more
core +1 more source
Open-path sensor based on QCL for atmospheric N2O measurement
Results in Physics, 2021 In this manuscript, a compact open-path gas sensor is developed for detection of atmospheric N2O. In such sensor, the wavelength modulation spectroscopy with 1f-normalized WMS detection strategy is employed to improve the detection sensitivity and ...
Yurong Zhang +4 more
doaj +1 more source
Hybrid Solution for Joint Transfer Time Signal With Both RF Frequency and Optical Frequency
IEEE Photonics Journal, 2021 We demonstrate a hybrid solution for simultaneous transfer of ultra-stable optical frequency, RF frequency and time signal on a 100 km fiber spool with the same wavelength based on coherent demodulation and optical phase-lock-loop (OPLL).
Jialiang Wang +8 more
doaj +1 more source
Performance of GPS sidereal filters during a satellite outage
Journal of Geodetic Science, 2017 Sidereal filtering is the name of a technique used to reduce the effect of multipath interference on a GPS position time series associated with a static or quasi-static antenna.
Atkins C., Ziebart M. K.
doaj +1 more source
Noise characteristics of a polarization-duplex dual-comb fiber laser based on a single gain fiber
Results in Optics, 2023 We demonstrate gain-sharing polarization-duplex dual-comb laser. Here, a nonlinear amplifying loop mirror (NALM) with a single gain fiber is used to achieve simultaneous mode-locking for the generation of the two frequency combs with slightly different ...
Kana Iwakuni, Aki Takahashi, Sho Okubo
doaj +1 more source
Practical Strategies for Stable Operation of HFF-QCM in Continuous Air Flow
Sensors, 2013 Currently there are a few fields of application using quartz crystal microbalances (QCM). Because of environmental conditions and insufficient resolution of the microbalance, chemical sensing of volatile organic compounds in an open system was as yet not
Siegfried R. Waldvogel +3 more
doaj +1 more source
Applied Sciences, 2019 A time division multiplexing differential modulation technique is proposed to address the interference problem caused by the fluctuation of laser light intensity in the single optical path detection system.
Biao Wang +6 more
doaj +1 more source
A versatile water vapor generation module for vapor isotope calibration and liquid isotope measurements [PDF]
Atmospheric Measurement TechniquesA versatile vapor generation module has been developed for both field-based water vapor isotope calibrations and laboratory-based liquid water isotope measurements.
H. C. Steen-Larsen +2 more
doaj +1 more source