A5079350644- Mechanical and Optical Resonators
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Nuclear physics research studies
- Advanced MEMS and NEMS Technologies
- Quantum Chromodynamics and Particle Interactions
- Quantum optics and atomic interactions
- Force Microscopy Techniques and Applications
- Radioactive Decay and Measurement Techniques
- Scientific Measurement and Uncertainty Evaluation
- Quantum Information and Cryptography
- Nuclear Physics and Applications
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Mass Spectrometry Techniques and Applications
- Various Chemistry Research Topics
- Advanced optical system design
University of California, Santa Barbara
2018-2025
University of York
2023
University of Warsaw
2023
Entanglement Technologies (United States)
2019-2021
University of California, Los Angeles
2014-2016
Yale University
2007-2012
Abstract Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances ability create, cool, control complex molecules down quantum level, along with recent upcoming species production at several facilities around world, create compelling opportunity coordinate combine these efforts bring precision measurement extreme nuclei. In...
We present the results of theoretical and experimental studies dispersively coupled (or 'membrane in middle') optomechanical systems. calculate linear optical properties a high finesse cavity containing thin dielectric membrane. focus on cavity's transmission, reflection as function membrane's position along axis its loss. compare these calculations with measurements find excellent agreement cavities empty-cavity finesses range 104–105. The imaginary part index refraction is found to be...
We have measured the optical and mechanical loss of commercial silicon nitride membranes. find that 50nm thick, 1mm2 membranes Q>106 at 293K, Q>107 300mK, well above what has been observed in devices with comparable dimensions. The near-IR 293K is less than 2×10−4. This combination properties make these attractive candidates for studying quantum effects optomechanical systems.
We describe an optomechanical device consisting of a fiber-based optical cavity containing silicon nitiride membrane. In comparison with typical free-space cavities, the fiber-cavity's small mode size (10 {\mu}m waist, 80 length) allows use smaller, lighter membranes and increases cavity-membrane linear coupling to 3 GHz/nm quadratic 20 GHz/nm^2. This is also intrinsically fiber-coupled uses glass ferrules for passive alignment. These improvements will greatly simplify systems, particularly...
We present an all-optical mass spectrometry technique to identify trapped ions. The new method uses laser-cooled ions determine the of a cotrapped dark ion with sub-dalton resolution within few seconds. apply first controlled synthesis cold, RaOH+ and RaOCH3+. These molecules are promising for their sensitivity time parity violations that could constrain sources physics beyond standard model. nondestructive nature may help molecular or highly charged prior optical spectroscopy. Unlike...
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
We report the first operation of a Ra^{+} optical clock, promising high-performance clock candidate. The uses single trapped ^{226}Ra^{+} ion and operates on 7s ^{2}S_{1/2}→6d ^{2}D_{5/2} electric quadrupole transition. By self-referencing three pairs symmetric Zeeman transitions, we demonstrate frequency instability 1.1×10^{-13}/sqrt[τ], where τ is averaging time in seconds. total systematic uncertainty evaluated to be Δν/ν=9×10^{-16}. Using realize measurement ratio D_{5/2} state S_{1/2}...
We report lifetime measurements of the metastable $6d\, ^2\!D_{5/2}$ and ^2\!D_{3/2}$ states radium ion. The measured lifetimes, $\tau_{5} = $ 303.8(1.5) ms $\tau_{3} 642(9) ms, are important for optical frequency standards benchmarking high-precision relativistic atomic theory. Independent reported measurements, $D$ state lifetimes were calculated using coupled-cluster single double triple method, in which equations both core valence excitations solved iteratively. method was designed...
We demonstrate a cryogenic optomechanical system comprising flexible Si3N4 membrane placed at the center of free-space optical cavity in 400 mK environment. observe mechanical quality factor Q > 4 x 10^6 for 261-kHz fundamental drum-head mode membrane, and resonance halfwidth 60 kHz. The therefore operates resolved sideband limit. monitor membrane's thermal motion using heterodyne circuit capable simultaneously measuring both sidebands, find that observed spring damping quantitatively agree...
Ultracold molecular gases are promising as an avenue to rich many-body physics, quantum chemistry, information, and precision measurements. This richness, which flows from the complex internal structure of molecules, makes creation ultracold using traditional methods (laser plus evaporative cooling) a challenge, in particular due spontaneous decay molecules into dark states. We propose way circumvent this key bottleneck all-optical method for decelerating stimulated absorption emission with...
Permanent electric dipole moments (EDMs) of fundamental particles such as the electron are signatures parity and time-reversal violation due to physics beyond standard model. EDM measurements probe new at energy scales well reach present-day colliders. Recent advances in assembling molecules from ultracold atoms have opened up opportunities for improving experiments. But better measurement techniques, that not limited by magnetic field sensitivity molecules, necessary before these can be...
An atomic transition can be addressed by a single tooth of an optical frequency comb if the excited state lifetime ($\tau$) is significantly longer than pulse repetition period ($T_\mathrm{r}$). In crossover regime between fully-resolved and unresolved teeth ($\tau \lessapprox T_\mathrm{r}$), we observe Doppler cooling pre-cooled trapped ion frequency-doubled comb. We find that for initially hot ions, multi-tooth effect gives rise to lasing ion's harmonic motion in trap, verified acoustic...
The unstable radium nucleus is appealing for probing new physics due to its high mass, octupole deformation, and energy level structure. Ion traps, with long hold times low particle numbers, are excellent work radioactive species, such as radium-based molecular ions, where activity, hence total desirable. We address the challenges associated lack of stable isotopes in a tabletop experiment low-activity ($\ensuremath{\sim}10\text{ }\text{ }\ensuremath{\mu}\mathrm{Ci}$) source we laser-cool...
Narrow linewidth visible light lasers are critical for atomic, molecular and optical (AMO) physics including atomic clocks, quantum computing, spectroscopy, sensing. Stimulated Brillouin scattering (SBS) is a promising approach to realize highly coherent on-chip laser emission. Here we report demonstration of photonic integrated laser, with emission at 674 nm, 14.7 mW threshold, corresponding threshold density 4.92 μm-2, 269 Hz linewidth. Significant advances in silicon nitride/silica...
Strong optical forces with minimal spontaneous emission are desired for molecular deceleration and atom interferometry applications. We report experimental benchmarking of such a stimulated force driven by ultrafast laser pulses. apply this technique to accelerate atoms, demonstrating up an average $19$ $\hbar k$ momentum transfers per event. This represents more than order magnitude improvement in suppression compared radiative scattering forces. For beam slowing, is capable delivering...
A stable optical resonator has been built using a 30-μm-wide, metal-coated microcantilever as one mirror. The second mirror was 12.7-mm-diameter concave dielectric By positioning the two mirrors 75mm apart in near-hemispherical configuration, Fabry-Pérot cavity with finesse equal to 55 achieved. limited by loss cantilever’s metal coating; diffraction losses from small were negligible. achieved passive laser cooling of Brownian motion.
Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances ability create, cool, control complex molecules down quantum level, along with recent upcoming species production at several facilities around world, create compelling opportunity coordinate combine these efforts bring precision measurement extreme nuclei. In this...
Ensembles of ultracold atoms suffer only minimally from thermal fluctuations and, accordingly, are useful in a variety fields. A new laser-cooling technique is demonstrated that can be applied to simple, abundant such as hydrogen and carbon.
Closed-shell atoms and molecules such as Hg TlF provide some of the best low-energy tests hadronic $\mathcal{CP}$ violation beyond standard model particle physics, which is considered to be a necessary ingredient explain observed excess matter over antimatter in our universe. expected strongly enhanced octupole-deformed nuclei $^{225}\mathrm{Ra}$. Recently, closed-shell radium-containing symmetric-top molecular ions were cooled sympathetically Coulomb crystal [Fan et al., Phys. Rev. Lett....
We discuss how molecule-based searches offer complementary probes to study the violation of fundamental symmetries. These experiments have potential probe not only electron EDM, but also hadronic CPV phenomena. Future experimental developments will generic sensitivity flavor neutral sources both leptonic and at scales $\geq$ 100 TeV, changing 1000 TeV.