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Showing 1 to 19 of 19 for “"Stark Shift"”.
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Strong Optical Field Ionization of Solids
… and conduction band and therewith the dynamic Stark shift. Our single-particle analysis identifies this as a potential reason for the different ionization behaviour. The dynamic Stark shift increases the bandgap with increasing laser intensities thus suppressing ionization to an extent where …
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The electric dipole moment in the B ³Π₀₊ state of molecular iodine monochloride
… field strength up to 32.5 kV/cm. From the Stark shift measurements, the dipole moment in vibrational level v' = 2 of the B ³Π₀₊ state, not previously measured experimentally, has been found to equal 1.122(25) D for I³⁵Cl and 1.116(35) D for I³⁷Cl . Intensity measurements of the (2-0) Q(0) …
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Stability enhancement of atomic timekeeping using Raman adiabatic rapid passage
… from serious systematic error sources, e.g., AC Stark shift and Zeeman shift, which alter the atomic resonance frequency. A new method based on adiabatic rapid passage (ARP) has been recently demonstrated at Draper which has significantly reduced phase sensitivity to differential AC Stark shift. …
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A Cavity-stabilized diode laser for dipole trapping of ytterbium
… wavelength for ytterbium, where the relative AC Stark shift for the two levels of the gain transition is zero to first order, there is no broadening due to varying intensity in the trap. Since the Doppler effect, recoil broadening and the AC Stark shift are the main sources of inhomogeneous …
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Ultracold bosons in optical lattices for quantum measurement and simulation
… simulation. Optical lattices, created by the AC Stark shift of a coherent laser beam, are a versatile tool to control ultracold atoms and implement novel Hamiltonians. In this thesis, I report on three experiments using the bosonic species Rubidium-87 trapped in optical lattices. I first discuss …
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Einfluss dynamischer Resonanzen auf die Wechselwirkung optischer Femtosekunden-Pulse mit transparenten Dielektrika
… the generation of higher harmonics or by the ac Stark shift of the energy levels in the laser field. For this work I perform quantum mechanical simulations of titanium dioxide and atomic hydrogen which confirm the existence of dynamic resonances by variation of the laser field's wavelength or …
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Theory Advances in High-Precision Two-Photon Spectroscopy
… relevant S and D states, quantifying the dynamic Stark shift, and transition matrix elements among these states are calculated, taking into account leading-order relativistic, radiative and non-dipole laser-field effects. An important broadening effect of the experimentally observed spectra in the …
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Multimode Circuit Quantum Electrodynamics With Superconducting Metamaterial Resonators
… dense mode spectrum. We also investigate the ac Stark shift of the qubit as the photon number in the various metamaterial modes is varied. Additionally, we compare these measurements with analytical and circuit simulation results.</p>
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The behavior of hydrogen and helium at white dwarf photosphere conditions
… mass derivation techniques suffer from uncertain Stark shift and neutral broadening models, while C WD masses are suspect due to unverified electron broadening parameters. Addressing each of these atomic physics limitations requires both experimental data and theoretical developments. The White …
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Investigation of quantum information storage in rare earth doped materials
… earth ions of interest also possess a linear Stark shift which is essential for the quantum memory under investigation here. The scheme investigated here for a quantum memory involves reversible inhomogeneous broadening achieved via macroscopic electric field gradients. The advantage that this …
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Investigation of quantum information storage in rare earth doped materials
… earth ions of interest also possess a linear Stark shift which is essential for the quantum memory under investigation here. The scheme investigated here for a quantum memory involves reversible inhomogeneous broadening achieved via macroscopic electric field gradients. The advantage that this …
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Cryogenic surface electrode ion traps with integrated superconducting microwave resonators for polar molecular ion spectroscopy
… based on confining neutral polar molecules in DC Stark shift traps, but this approach presents some issues. An attractive alternative is to confine polar molecular ions in RF Paul ion traps, which is the focus of this thesis. The objectives here are to develop the theoretical models and to devise …
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One- and two-qubit operations in Si-MOS quantum dots
… spin-orbit interactions. Finally, we exploit the Stark shift to reduce its sensitivity to electric noise and observe an 80% increase in the coherence time T_2^*. We proved that when understood and controlled, the small but significant spin-orbit interaction, can be used as a powerful resource. …
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Design and implementation of parity error detection in donor qubits in silicon
… fields of 3.2MV/m and 3.8MV/m gave rise to a Stark shift of 41±31MHz/(MV/m). Using the ESR spectra, Stark shift measurements and tight binding simulations of the donor hyperfine Hamiltonian we are able to locate the exact configuration of the phosphorus atoms within the 2P donor molecule with …
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Coherent optical nonlinearities in semiconductor microstructures
… studied. In the first part the excitonic optical Stark effect in InGaAs and GaAs multiple quantum-well structures is investigated by means of pump-probe spectroscopy. For nonresonant excitation below the excitonic transition the direction of the shift of the resonance depends on the polarization …
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Rydberg atom networks for quantum technologies [Reti atomiche Rydberg per le tecnologie quantistiche]
… ottiche. Il sensore sfrutta la dipendenza dello Stark-shift dei livelli di Rydberg dal campo elettrico, che modifica efficacemente le interazioni dipolo-dipolo e quindi i raggi di “blockade". Il nostro metodo di rilevamento si basa su misure locali delle eccitazioni di Rydberg di singoli atomi, …
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An investigation of giant Kerr nonlinearity
… emission noise. The fourth level leads to an ac-Stark shift of the ground state, which in turn leads to a giant, noiseless Kerr nonlinearity. Two different environments are explored. First, a system comprising of large number of atoms in an optical cavity is analysed. Detailed aspects of noise …
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Two-photon spectra of Rydberg states of alkaline-earth atoms (strontium and barium)
… observation of certain anomalies including a Stark shift reversal effect and zero-field thermionic diode detection with remarkable sensitivity preserving all spectral features of Rydberg states is also presented. Controlled configuration mixing by exploiting electric field and collisions has …
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Dinamica effettiva di sistemi quantistici driven chiusi e aperti
… terms determine the usual Bloch-Siegert shifts off-resonance (besides the Stark shift due to the corotating field), while giving at resonance, besides the Bloch-Siegert, a renormalization of the amplitude of the corotating field. As a final application of coarse graining by the Magnus …