A5056299744- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Spectroscopy and Laser Applications
- Advanced Frequency and Time Standards
- Molecular spectroscopy and chirality
- Spectroscopy and Quantum Chemical Studies
- Quantum, superfluid, helium dynamics
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Scientific Computing and Data Management
- Astronomical Observations and Instrumentation
- COVID-19 diagnosis using AI
- Time Series Analysis and Forecasting
- Magnetic Field Sensors Techniques
- Mechanical and Optical Resonators
- Machine Learning in Materials Science
- Laser-Matter Interactions and Applications
- Optical Polarization and Ellipsometry
- Advanced NMR Techniques and Applications
- Magnetic and transport properties of perovskites and related materials
- Advanced MRI Techniques and Applications
- Thin-Film Transistor Technologies
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
FORTH Institute of Electronic Structure and Laser
2018-2024
Foundation for Research and Technology Hellas
2012-2023
FORTH Institute of Chemical Engineering Sciences
2019-2022
University of Crete
2007-2021
Spin noise sets fundamental limits to the attainable precision of measurements using spin-polarized atomic vapors and therefore merits a careful study. On other hand, it has been recently shown that spin contains useful physical information about system, otherwise accessible via magnetic-resonance-type experiments. We here show in yet another manifestation fluctuation-dissipation theorem, reveals on spin-coherence dissipation properties described by $1∕{T}_{2}$, transverse spin-relaxation...
We present the theory and experimental details for chiral-cavity-ring-down polarimetry magnetometry, based on ring cavities supporting counterpropagating laser beams. The optical-rotation symmetry is broken by presence of both chiral Faraday birefringence, giving rise to signal reversals which allow rapid background subtractions. measurement specific rotation at 800 nm vapors α-pinene, 2-butanol, α-phellandrene, optical sucrose solutions in a flow cell, Verdet constant fused silica,...
We propose the measurement of cavity-enhanced parity-nonconserving (PNC) optical rotation in several transitions metastable Xe and Hg, including (2P(3/2)(o))6s(2)[3/2](2)(o)→(2P(1/2)(o))6s(2)[1/2](1)(o) Hg 6s6p (3)P(2)(o)→6s6p (1)P(1)(o), with calculated amplitude ratios E(1)(PNC)/M1=11×10(-8) 10×10(-8), respectively. demonstrate use a high-finesse bow-tie cavity counterpropagating beams longitudinal magnetic field, which allows absolute chiral rotation, path length enhancement about 10(4),...
We present the theoretical basis of a cavity-enhanced polarimetric scheme for measurement parity-nonconserving (PNC) optical rotation. discuss possibility detecting PNC rotation in accessible transitions metastable Xe and Hg ground-state I. In particular, physics is presented we explore line-shape effects on expected signals. Furthermore, an analysis eigenpolarizations polarimeter, which necessary understanding procedure ability employing robust background subtraction procedures using two...
We present an implementation of a robust quantum random number generator based on the fluctuations collective spin alkali-metal vapor. The achieved bit rate is limited by relaxation atoms $1/{T}_{2}$ to about 1 kbit/s. However, same physical scheme, which impervious limitations posed single-photon detectors used in current implementations and rests solely threshold detection, can be extended solid state systems with higher than Gbit/s.
We present a compact polarimeter, which can perform sensitive measurements of optical rotation in vapor. The operation the polarimeter is based on Cavity Ring-Down scheme employs two signal reversals, increase sensitivity and reduce noise, allowing realization presence spurious birefringence. describe give basic equations for analysis retrieval angle, that demonstrate ∼80 μdeg/pass.
Atomic magnetometers have achieved magnetic sensitivities in the subfemtotesla regime. Their bandwidth is determined by transverse spin relaxation rate, 1/T2, which also determines sensitivity. It theoretically demonstrated that using an electromagnetically induced transparent probe beam a pump-probe atomic magnetometer, it possible to operate latter at frequencies much higher than its bandwidth, maintaining high signal-to-noise ratio.
Radical-ion pair reactions are currently understood to underlie the biochemical magnetic compass of migratory birds. It was recently shown that radical-ion form a rich playground for application quantum-information-science concepts and effects. We will show here intricate interplay between quantum Zeno effect coherent excitation pairs leads an exquisite angular sensitivity reaction yields. This results in significant previously unanticipated suppression avian heading error, opening way...
We present an experimental apparatus that allows microsecond-resolved ellipsometric and absorption measurements. The is based on optical cavity containing a Dove prism, in which light undergoes total internal reflection (TIR), while the data acquisition software defined radio technology custom-built drivers. demonstrate ability to sense rapid variations refractive index above TIR interface for arbitrarily long times with temporal resolution of at least 2 μs.
We demonstrate a method for determining small absorption coefficients and surface-scattering losses of crystals using cavity ring-down spectroscopy perform measurements on magneto-optical terbium gallium garnet (TGG), phosphate (TGP), fused silica (FS), potassium fluoride (KTF), CeF 3 at 532 634 nm. Surface scattering is distinguished from by different lengths. A figure merit (FoM) defined to evaluate their suitability as intracavity optics in optical applications. It found that TGP has the...
We examine the feasibility of a parity non-conserving (PNC) optical rotation experiment for $^2$P$_{3/2}\rightarrow ^2$P$_{1/2}$ transition atomic iodine at 1315 nm. The calculated $E1_{\rm PNC}$ to $M1$ amplitude ratio is $R=0.80(16)\times 10^{-8}$. show that very large PNC rotations (greater than 10 $\mu$rad) are obtained iodine-atom column densities $\sim 10^{22}$ cm$^{-2}$, which can be produced by increasing effective interaction pathlength factor 10^4$ with high-finesse cavity....
We introduce a novel and sensitive ns-resolved atomic magnetometer, which is at least three orders of magnitude faster than conventional magnetometers.
We measure the magnetization quantum beats of spin-polarized hydrogen (SPH) and deuterium (SPD) with a pickup coil, from UV photodissociation HCl, HBr, DI, in 5–5000 mbar pressure range. The pressure-dependent depolarization rate is linear at low pressures reaches plateau higher pressures. high-pressure observed to be proportional halogen nuclear electric quadrupole coupling constant. also investigate how presence an inert gas, SF6 or N2, affects rate. results are explained using model which...
We report the electron-spin polarization of D atoms from photodissociation DI, at 213 nm and 266 nm, by measuring magnetization quantum beats with a pick-up coil. determine that P is large both wavelengths (|P|∼ 1), however it positive negative nm. These results, in cases, are opposite sign to calculations, which assume adiabatic dissociation along A1Π1 or a3Π1 states. interpret these results as evidence nonadiabatic coupling between states needs be included for theoretical treatment DI...
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We study the polarization dynamics of molecular rotation and nuclear spin in presence magnetic fields, hydrogen isotope molecules, ${\mathrm{H}}_{2},\phantom{\rule{0.16em}{0ex}}{\mathrm{D}}_{2}$, HD. If only rotational or angular momentum is polarized, transferred from one to other back a oscillatory fashion, due hyperfine quantum beats. Application fields shown increase frequencies these oscillations reduce their amplitude so that exchange can be strongly suppressed. derive time-averaged as...
We identify a pair of near-degenerate states opposite parity in atomic Xe, the $5{p}^{5}10s{\phantom{\rule{0.16em}{0ex}}}^{2}{[3/2]}_{2}^{o}$ at $E=94\phantom{\rule{0.16em}{0ex}}759.927$ cm${}^{\ensuremath{-}1}$ and $5{p}^{5}6f{\phantom{\rule{0.16em}{0ex}}}^{2}{[5/2]}_{2}$ $E=94\phantom{\rule{0.16em}{0ex}}759.935$ cm${}^{\ensuremath{-}1}$, for which parity- time-odd effects are expected to be enhanced by small energy separation. present theoretical calculations indicate narrow widths both we...
Abstract Steady-state column densities of 10 17 cm −2 I( 2 P 3/2 ) atoms are produced from photodissociation I vapour at 290.5 K using 5 W 532 nm laser light. Recombination the cell walls is minimized by coating surface with a hydrophobic silane (dimethyldichlorosilane/DMDCS). Operation room temperature, and an pressure ~0.2 mbar, without buffer gas, allows relatively low Lorentz Doppler widths ~2 π × 1.5 (FWHM) 150 (HW 1/ e Mrad/s, respectively, "Equation missing"<!-- image only, no MathML...