A5049270639- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Scientific Measurement and Uncertainty Evaluation
- Laser Design and Applications
- Solid State Laser Technologies
- Advanced Measurement and Metrology Techniques
- Semiconductor Lasers and Optical Devices
- Laser-Matter Interactions and Applications
- Cardiovascular Syncope and Autonomic Disorders
- Advanced Photonic Communication Systems
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Quantum Mechanics and Applications
- Radioactive Decay and Measurement Techniques
- Diamond and Carbon-based Materials Research
- Photonic and Optical Devices
- Noncommutative and Quantum Gravity Theories
- Geophysics and Sensor Technology
- Calibration and Measurement Techniques
All-Russian Scientific Research Institute of Physical-Technical and Radiotechnical Measurements
2015-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2010-2014
University of Pisa
2009-2012
University of Florence
2010-2012
National Interuniversity Consortium for the Physical Sciences of Matter
2012
Institute of Laser Physics
2007
We report on a conceptually new test of the equivalence principle performed by measuring acceleration in Earth's gravity field two isotopes strontium atoms, namely, bosonic (88)Sr isotope which has no spin versus fermionic (87)Sr half-integer spin. The effect atomic species been probed means precision differential measurement Bloch frequency for matter waves vertical optical lattice. obtain values η=(0.2±1.6)×10(-7) Eötvös parameter and k=(0.5±1.1)×10(-7) coupling between nuclear gravity....
The possibility of using an atom chip and a diffraction grating to form compact magneto-optical trap for ytterbium atoms, which can be used develop atomic interferometers optical clocks based on ultracold has been studied. An experiment the laser cooling 171 Yb 174 isotopes in first‑stage carried out determine initial requirements mentioned elements. design forming magnetic field gradient up 60 G/cm calculated. optimal configurations that allow both first- second-stage traps have evaluated.
We realized a coherent optical fiber link in Italy, with haul of 642 km. To characterize the link, we doubled to 1284 km, demonstrating characterization technique based on double round trip single fiber. The is intended significantly improve frequency references used radio-astronomy and precision measurements atomic physics. data analysis Allan deviation, whose expression theoretically derived from noise power spectrum. demonstrated resolution 3×10−19 1000 s uncertainty transfer 5×10−19....
Incorporation of a strontium optical clock as an frequency reference into the primary standard GET 1-2018 is experimentally implemented. A new model proposed to define local atomic time scale using incorporated complex for reproducing units. Preliminary results comparing frequencies and hydrogen maser entering composition standards are presented.
Abstract A frequency chain for converting the of an optical clock based on ultracold 87 Sr atoms is updated its comparison with microwave standards from State Primary Standard time and units national scale, GET 1-2018. The results corresponding experiments are reported analysed. An instrumental complex reproducing keeping scale primary standard described; this includes strontium new generation. order atomic generation application clocks also determined.
We presented the first prototype of transportable laser-cooled strontium source. Novel design solutions have been discussed with a final volume, mass and power consumption budget for atomic-package 210 liters, 120 kg 110 W, respectively. Most home made components assembled tested. The system is currently under characterization it already able to produce sample about 108 atoms at 1 mK temperature. Next steps will be integration this second stage cooling laser clock in order realize fully...
Here we report on absolute frequency measurements of a commercial high power CW diode-pumped solid-state laser (Coherent Verdi-V5). This kind lasers usually presents large jitter (up to 50 MHz) both in the short term (1 ms time scale) and long (>10 s scale). A precise measurement deviations temporal scales should require set different devices (optical cavities, optical wave-meters), each suited for only at specific integration time. demonstrate how comb can be used overcome this difficulty,...
This paper examines methods for increasing the duration of autonomous continuous operation optical frequency standards. We have realised secondary cooling strontium atoms without using phase stabilisation during formation and intermixing light beams proposed a clock laser algorithm that compensates acoustic noise-induced instability. Experiments been performed two distinct algorithms to an atomic transition. The maximum system was 25 000 50 s with one 70 200 other algorithm.
We report on our progress toward the realization of a Strontium optical lattice clock, which is under development at VNIIFTRI as part GLONASS program. We've prepared narrow line width laser system for secondary cooling 88Sr atoms allows us to reach atom cloud temperature below 3 μK after second stage.
We experimentally study two Ti:sapphire optical frequency comb femtosecond regimes, respectively, with a linear and nonlinear dependence of the carrier-envelope offset (fCEO) on pump intensity. For both we effect single- multimode lasers fCEO phase noise. demonstrate that regime is playing more important role noise stability than laser type.
We describe the realization of a coherent optical fiber link for metrological frequency dissemination on national scale. This infrastructure will improve references used in radio-astronomy and atomic physics benefit several laboratories Italy involved high resolution spectroscopy, matter radioastronomy. The present be part forthcoming European network links. paper describes haul implementation, characterization future applications this backbone.
Abstract We have assessed the effect of optical lattice laser field parameters (polarisation, intensity, and wavelength) a cold-ytterbium atomic frequency standard on systematic uncertainty precision clock transition measurements. The spectrum polarisation been investigated in detail directly spatial region interaction cold ytterbium atoms with field. Stark shift vicinity magic wavelength has estimated as function experimentally measured intensity dipole approximation. estimates used to...
We report on recent realization of an optical lattice clock operating the <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> S <sub xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> - xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> P transition in xmlns:xlink="http://www.w3.org/1999/xlink">88</sup> Sr, at LENS laboratories. The is excited with technique magnetic field-induced spectroscopy. New experimental techniques has also been...
ФГУП «ВНИИФТРИ», Менделеево, Московская обл
In this work we present our experimental scheme for the time scale generation based on an optical strontium frequency standard with use of and radio keepers. The uncertainty budget absolute value <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">87</sup> Sr respect caesium, rubidium fountains UTC (SU) are evaluated as well.
The results obtained during the development of an optical frequency standard, based on cold 87Sr atoms are presented. parameters experimental schemes developed for realization all stages sequential laser cooling and trapping into lattice described. Clock transition spectroscopy was successfully performed with a spectral linewidth 12 Hz. A measuring scheme femtosecond synthesizer has been developed, which makes it possible to compare standard hydrogen maser. created included in primary GET 1-2018.
We realized a 650-km optical fiber link in Italy for frequency dissemination and remote clocks comparison. present its implementation characterization at the 5×10−19 uncertainty level, discussing future applications.