A5016757648- Atomic and Molecular Physics
- Spectroscopy and Laser Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Quantum Electrodynamics and Casimir Effect
- Advanced Fiber Laser Technologies
- Orbital Angular Momentum in Optics
- Advanced Chemical Physics Studies
- Mechanical and Optical Resonators
- Quantum Mechanics and Applications
- Radioactive Decay and Measurement Techniques
- Atmospheric Ozone and Climate
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Scientific Measurement and Uncertainty Evaluation
- Chemistry and Stereochemistry Studies
- Adaptive optics and wavefront sensing
- Mass Spectrometry Techniques and Applications
- Noncommutative and Quantum Gravity Theories
- Analytical Chemistry and Sensors
- Optical and Acousto-Optic Technologies
- Scientific Research and Discoveries
- Photorefractive and Nonlinear Optics
- Laser-induced spectroscopy and plasma
- Atomic and Subatomic Physics Research
Northwestern University
2022-2023
Max Planck Institute of Quantum Optics
2015-2022
University of Nevada, Reno
2022
Max Planck Society
2016
At the core of "proton radius puzzle" is a four-standard deviation discrepancy between proton root-mean-square charge radii (rp) determined from regular hydrogen (H) and muonic (µp) atoms. Using cryogenic beam H atoms, we measured 2S-4P transition frequency in H, yielding values Rydberg constant R∞ = 10973731.568076(96) per meterand rp 0.8335(95) femtometer. Our value 3.3 combined standard deviations smaller than previous world data, but good agreement with µp value. We motivate an...
We have performed two-photon ultraviolet direct frequency comb spectroscopy on the 1S-3S transition in atomic hydrogen to illuminate so-called proton radius puzzle and demonstrate potential of this method. The is a significant discrepancy between data obtained with muonic regular that could not be explained within framework quantum electrodynamics. By combining our result [f1S-3S = 2,922,743,278,665.79(72) kilohertz] previous measurement 1S-2S frequency, we new values for Rydberg constant...
To test the quantum nature of gravity in a laboratory requires witnessing entanglement between two masses (nanocrystals) solely due to gravitational interaction kept at distance spatial superposition. The protocol is known as quantum-gravity-induced (QGEM). One main backgrounds QGEM experiment electromagnetic (EM) -induced and decoherence. EM interactions can entangle neutral via dipole-dipole vacuum-induced interactions, such Casimir-Polder interaction. mitigate EM-induced nanocrystals, we...
We give a pedagogical description of the method to extract charge radii and Rydberg constant from laser spectroscopy in regular hydrogen (H) deuterium (D) atoms, that is part CODATA least-squares adjustment (LSA) fundamental physical constants. deuteron radius D alone 2.1415(45) fm. This value independent measurements lead proton radius, five times more accurate than found Adjustment 10. The improvement due use for transition atomic which can be inferred published data or PhD thesis.
We identify a systematic present in two-photon direct frequency comb spectroscopy (DFCS) which is result of chirped laser pulses and manifestation the first-order Doppler effect. carefully analyze this propose methods for its mitigation within context our measurement hydrogen $1S\ensuremath{-}3S$ transition. also report on determination absolute transition, comparable to previous using continuous-wave [O. Arnoult et al., Eur. Phys. J. D 60, 243 (2010)], but was obtained with different...
Abstract High‐resolution laser spectroscopy serves the purpose of determining energy difference between states atoms and molecules with best possible accuracy. Therefore, one may face problem finding center a symmetric line within small fraction width, or needs to extract from an asymmetric without uniquely defined center. Multiplets atomic resonance lines are subject mutual pullings give rise distortions due quantum interference. This paper reviews treatment these for dipole‐allowed...
We present an active fiber-based retroreflector providing high quality phase-retracing anti-parallel Gaussian laser beams for precision spectroscopy of Doppler sensitive transitions. Our design is well-suited a number applications where implementing optical cavities technically challenging and corner cubes fail to match the demanded requirements, most importantly retracing wavefronts preservation polarization. To illustrate performance system, we use it 2S-4P transition in atomic hydrogen...
We describe the design, construction, and operation of an apparatus that utilizes a piezoelectric transducer for in-vacuum loading nanoparticles into optical trap use in levitated optomechanics experiments. In contrast to commonly used nebulizer-based trap-loading methods generate aerosolized liquid droplets containing nanoparticles, method produces dry aerosols both spherical high-aspect ratio particles ranging size by approximately two orders magnitude. The device has been shown...
We present an improved active fiber-based retroreflector (AFR) providing high-quality wavefront-retracing anti-parallel laser beams in the near UV. use our AFR for first-order Doppler-shift suppression precision spectroscopy of atomic hydrogen, but setup can be adapted to other applications where with defined polarization are important. demonstrate how weak aberrations produced by fiber collimator may remain unobserved intensity collimated beam limit performance AFR. Our general results on...
The core of the "proton radius puzzle" is discrepancy four standard deviations between proton root mean square charge radii (rp) determined from regular hydrogen (H), and muonic atom (μp). We have measured 2S-4P transition frequency in H, utilizing a cryogenic beam H directly demonstrate that quantum interference neighboring atomic resonances can lead to line shifts much larger than discrepancy. Using an asymmetric fit function we obtain rp = 0.8335(95) fm Rydberg constant R∞ 10 973 731.568...
Optically-levitated dielectric objects are promising for precision force, acceleration, torque, and rotation sensing due to their extreme environmental decoupling. While many levitated opto-mechanics experiments employ spherical objects, some applications non-spherical geometries offer advantages. For example, rod-shaped or dumbbell shaped particles have been demonstrated torque high aspect ratio plate-like can exhibit reduced photon recoil heating may be useful high-frequency gravitational...
The Quantum Gravity Mediated Entanglement (QGEM) protocol offers a novel method to probe the quantumness of gravitational interactions at non-relativistic scales. This leverages Stern-Gerlach effect create $\mathcal{O}(\sim \mu m)$ spatial superpositions two nanodiamonds (mass $\sim 10^{-15}$ kg) with NV spins, which are then allowed interact and become entangled solely through interaction. Since electromagnetic such as Casimir-Polder dipole-dipole dominate this scale, screening them ensure...
To test the quantum nature of gravity in a lab requires witnessing entanglement between two masses (nano-crystals) solely due to gravitational interaction kept at distance spatial superposition. The protocol is known as gravity-induced (QGEM). One main backgrounds QGEM experiment electromagnetic (EM) induced and decoherence. EM interactions can entangle neutral via dipole-dipole vacuum-induced interactions, such Casimir-Polder interaction. mitigate EM-induced nano-crystals, we enclose...
We report on the results of two-photon spectroscopy 1S-3S transition in atomic hydrogen using picosecond mode-locked laser. The chirp laser pulses leads to frequency shift proportional velocity atoms.
Testing theories means to compare precise measurements with theoretical predictions. I will describe where we stand quantum electrodynamics by verifying calculations of energy levels in atomic hydrogen. © 2019 The Author(s)
Testing theories means to compare precise measurements with theoretical predictions. I will describe where we stand quantum electrodynamics by verifying calculations of energy levels in atomic hydrogen.
Zusammenfassung Neue physikalische Erkenntnisse ergeben sich aus der Beobachtung neuer Phänomene oder Widersprüchen zwischen Theorie und Experiment. Die 1814 von Fraunhofer beobachten Linien im Sonnenspektrum sind ein gutes Beispiel für neues, zu seiner Zeit unbekanntes Phänomen. Das führte zur Entwicklung des wichtigen Forschungsgebiets Spektroskopie. Bei vermeintlichen Experiment muss zunächst sichergestellt werden, dass sowohl die Berechnungen als auch Messungen fehlerfrei sind,...
The 53rd Annual Meeting of the APS Division Atomic, Molecular and Optical Physics will take place from May 30 – June 3, 2022 in Orlando, Fl, USA. <a href="https://morressier.zoom.us/j/89880865272?pwd=SWxTRGhra1ZOSDBrSkhVZDBzVDR6UT09/">Virtual Presenter Help Desk</a>
We describe the design, construction, and operation of an apparatus utilizing a piezoelectric transducer for in-vacuum loading nanoparticles into optical trap use in levitated optomechanics experiments. In contrast to commonly used nebulizer-based trap-loading methods which generate aerosolized liquid droplets containing nanoparticles, method produces dry aerosols both spherical high-aspect ratio particles ranging size by approximately two orders mangitude. The device has been shown...
Der Doppler‐Effekt ist ein großer Störfaktor bei der Spektroskopie von Gasen. Bei Zweiphotonenspektroskopie mit Hilfe eines Frequenzkamms lässt er sich weitgehend vermeiden.