A5076559825- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Advanced Fiber Laser Technologies
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Advanced Fiber Optic Sensors
- Solid State Laser Technologies
- Atmospheric and Environmental Gas Dynamics
- Microwave and Dielectric Measurement Techniques
- Oceanographic and Atmospheric Processes
- Photonic and Optical Devices
- Optical Network Technologies
- Cardiovascular Syncope and Autonomic Disorders
- Methane Hydrates and Related Phenomena
- Quantum Information and Cryptography
- Primary Care and Health Outcomes
- Health Sciences Research and Education
- Interprofessional Education and Collaboration
- Laser-Matter Interactions and Applications
University of Copenhagen
2014-2021
RIKEN Advanced Science Institute
2012
The University of Tokyo
2012
Lyngsø Marine (Denmark)
1993
Highly stable laser sources based on narrow atomic transitions provide a promising platform for direct generation of and accurate optical frequencies. Here we investigate simple system operating in the high-temperature regime cold atoms. The interaction between thermal ensemble $^{88}$Sr at mK temperatures medium-finesse cavity produces strong collective coupling facilitates high coherence which causes lasing dipole forbidden $^1$S$_0 \leftrightarrow ^3$P$_1$ transition. We experimentally...
A new highly accurate dispersion measurement technique is presented, which uses a standard lightwave component analyser. By employing tunable external laser source the measured over wavelength range of 70 nm with an accuracy 0.02 ps/km/nm, enables us to observe fluctuations and substructures on curve.
As an alternative to state-of-the-art laser frequency stabilization using ultrastable cavities, it has been proposed exploit the nonlinear effects from coupling of atoms with a narrow transition optical cavity. Here, we have constructed such system and observed phase shifts line by strong sample strontium-88 The temperature few mK provides domain where Doppler energy scale is several orders magnitude larger than linewidth transition. This makes sensitive velocity dependent multiphoton...
We study the non-linear interaction of a cold sample strontium-88 atoms coupled to single mode low finesse optical cavity in so-called bad limit and investigate implications for applications laser stabilization. The are probed on weak inter-combination line $\lvert 5s^{2} \, ^1 \textrm{S}_0 \rangle \,-\, \lvert 5s5p ^3 \textrm{P}_1 \rangle$ at 689 nm strongly saturated regime. Our measured observables include atomic induced phase shift absorption light field transmitted through represented...
Hybrid systems of cold atoms and optical cavities are promising for increasing the stability laser oscillators used in quantum metrology atomic clocks. In this paper we map out atom-cavity dynamics such a system demonstrate limitations as well robustness approach. We investigate phase response an ensemble $^{88}\mathrm{Sr}$ inside cavity use error signal frequency stabilization. With realize regime where high shift limits dynamical locking range. The limitation is caused by transfer function...
Lasing in the bad cavity regime has promising applications precision metrology due to reduced sensitivity noise. Here we investigate spectral properties and phase behavior of pulsed lasing on $^1$S$_0 - ^3$P$_1$ line $^{88}$Sr a mK thermal ensemble, as first described arxiv:1903.12593. The system operates where Doppler-broadened atomic transition linewidth is several times larger than linewidth. We find that by detuning resonance, influence noise peak frequency can be eliminated order...
We consider the phase stability of a local oscillator (or laser) locked to cavity-QED system composed atoms with an ultranarrow optical transition. The are cooled milli-Kelvin temperatures and then released into cavity. Although atomic motion introduces Doppler broadening, standing-wave nature cavity causes saturated absorption features appear, which much narrower than width. These can be used achieve extremely high degree stabilization, competitive current state art. Furthermore,...
Cavity enhanced spectroscopy on ultra-narrow transitions in atoms and molecules is a promising tool for frequency stabilization of clock lasers. However, the small beam waist typical cavity can effectively reduce number system or introduce transit time broadening less controlled molecular systems. We present design with an internal telescope optimized to increase from about 0:5 mm 5 while still maintaining convenient range tuning parameters. Its usefulness three separate spectroscopic...
The development of simple and reliable high stability clock lasers is great importance for future state-of-the-art optical clocks [1]-[5] transportable [6], [7]. Further with better has so far been hindered by thermal noise in the reference cavity used laser stabilization conventional approaches improvements may be technically challenging. It proposed [8]-[11] to improve reduce complexity frequency exploiting QED systems consisting atoms a narrow transition coupled single mode an cavity....
We consider the phase stability of a local oscillator (or laser) locked to cavity QED system comprised atoms with an ultra-narrow optical transition. The are cooled millikelvin temperatures and then released into cavity. Although atomic motion introduces Doppler broadening, standing wave nature causes saturated absorption features appear, which much narrower than width. These can be used achieve extremely high degree stabilization, competitive current state-of-the-art. Furthermore,...
The stability of current state-of-the-art optical atomic clocks [1]-[5] is mostly limited by the frequency noise interrogation oscillator through Dick effect. To achieve heralded ultimate stability, future standards will need to produce light sources with at 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−17</sup> fractional level or below one second integration time. Recently, a new frontier in cavity stabilized laser has pushed instability...
Received 11 September 2015DOI:https://doi.org/10.1103/PhysRevA.92.039902©2015 American Physical Society
We are developing optical lattice clocks with a scope of attaining 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-18</sup> fractional uncertainty. Cryogenic silicon cavity targeting 2×10 xmlns:xlink="http://www.w3.org/1999/xlink">-17</sup> stability at 1s, will allow full utilization the potential clocks. In order to reduce blackbody radiation shift, which is most serious source uncertainties, Sr in cryogenic environment and Hg...