Giannis Drougakis
A5056388411- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Orbital Angular Momentum in Optics
- Optical Wireless Communication Technologies
- Quantum, superfluid, helium dynamics
- Adaptive optics and wavefront sensing
- Advanced Measurement and Metrology Techniques
- Near-Field Optical Microscopy
- Strong Light-Matter Interactions
- Advanced Optical Network Technologies
- Satellite Communication Systems
- Electronic and Structural Properties of Oxides
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
FORTH Institute of Electronic Structure and Laser
2024-2025
Foundation for Research and Technology Hellas
2018-2024
University of Crete
2018-2021
Abstract We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning status of cold atom technologies, prospective scientific and societal opportunities offered by their deployment space, developments needed before atoms could be operated space. The technologies discussed include atomic clocks, quantum gravimeters accelerometers, interferometers. Prospective applications metrology, geodesy measurement terrestrial mass change due to, e.g., climate change,...
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
Recent developments in quantum technology have resulted a new generation of sensors for measuring inertial quantities, such as acceleration and rotation. These can exhibit unprecedented sensitivity accuracy when operated space, where the free-fall interrogation time be extended at will environment noise is minimal. European laboratories played leading role this field by developing concepts tools to operate these relevant environment, parabolic flights, towers, or sounding rockets. With...
We present a simple precision-method to quickly and accurately measure the diameters of Gaussian beams, Airy spots, central peak Bessel beams ranging from sub-millimeter many centimeters without specialized equipment. Simply moving wire through beam recording relative losses using an optical power meter, one can easily with precision 1%. The accuracy this method has been experimentally verified for down limit commercial slit-based profiler (3%).
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
We consider a Bose-Einstein condensate, which is confined in very tight toroidal/annular trap, the presence of potential, breaks axial symmetry Hamiltonian.We investigate stationary states when its density distribution co-rotates with symmetry-breaking potential.As strength potential increases, we have gradual transition from vortex excitation to solid-body-like motion.Of particular importance are where system static and yet it has nonzero current/circulation, realization persistent...
Optical communications (OC) is an emerging transformative technology for scientific, commercial, and defense applications.Compared to radio-frequency (RF) communications, it can offer higher bandwidth, lower power consumption, reduced size mass of transceivers.Narrow, directed beams light, OC in principle increase link security enable optical quantum communication, which provides absolute physical security.Free-space satellite networks will employ both satellite-satellite satellite-Optical...
We present a slave laser highly suitable for the preparation and detection of 87Rb Bose-Einstein condensates (BEC). A anti-reflection coated diode serves as an optical amplifier, which requires neither active temperature stabilization nor dedicated equipment monitoring spectral purity amplified light. The power can be controlled with precision 10 μW in 70 mW relative fluctuations down to 2 × 10−4. Due its simplicity reliability, this will useful tool laboratory, mobile, or even space-based...
This approach permits much finer adjustments of the beam direction and position when compared to other steering techniques same mechanical precision. results in a increased precision, accuracy stability. A precision better than 5 {\mu}rad {\mu}m is demonstrated, resulting resolution coupling efficiency 0.1%. Together with added flexibility an additional element, this allows great simplification design fiber coupler, which normally most complex sensitive element on optical breadboard. We...