Author
I. Klaft
Other affiliations: Darmstadt University of Applied Sciences
Bio: I. Klaft is an academic researcher from University of Mainz. The author has contributed to research in topics: Laser & Optical parametric oscillator. The author has an hindex of 7, co-authored 19 publications receiving 390 citations. Previous affiliations of I. Klaft include Darmstadt University of Applied Sciences.
Papers
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TL;DR: The first direct observation of a hyperfine splitting in the optical regime is reported, and should allow a novel test of ED corrections in the previously unexplored combination of strong magnetic and electric fields in highly charged ions.
Abstract: The first direct observation of a hyperfine splitting in the optical regime is reported. The wavelength of the $M1$ transition between the $F=4$ and $F=5$ hyperfine levels of the ground state of hydrogenlike $^{209}\mathrm{Bi}^{82+}$ was measured to be ${\ensuremath{\lambda}}_{0}=243.87(4)$ nm by detection of laser induced fluorescence at the heavy-ion storage ring ESR at GSI. In addition, the lifetime of the laser excited $F=5$ sublevel was determined to be ${\ensuremath{\tau}}_{0}=0.351(16)$ ms. The method can be applied to a number of other nuclei and should allow a novel test of QED corrections in the previously unexplored combination of strong magnetic and electric fields in highly charged ions.
213 citations
Patent•
10 Jun 1996
TL;DR: In this paper, a tunable narrowband source of a coherent radiation, comprising a first optical parametric oscillator (OPO1) which includes at least one first OO amplifier medium (K 1 ) in a resonator (18, 20; 20, 34) or an OO generator, was described.
Abstract: A tunable narrowband source of a coherent radiation, comprising a first optical parametric oscillator (OPO1) which includes at least one first optical parametric amplifier medium (K 1 ) in a resonator (18, 20; 20, 34) or an optical parametric generator; at least one second optical parametric oscillator (OPO2) which includes at least one second optical parametric amplifier medium (K 2 ) in a resonator (22, 24) and into which is coupled the output radiation (28; 28b) of the first optical parametric oscillator (OPO1); at least one third optical parametric amplifier medium (OPA) into which is coupled the output radiation (30) of the second optical parametric oscillator (OPO2); and means (12, 14, 16, 26) for generating and coupling the pump radiation (10, 10') into the first and second optical parametric oscillators (OPO1, OPO2) and into the third optical parametric amplifier medium OPA), wherein the output radiation (28; 28b) of the first optical parametric oscillator (OPO1) which is coupled into the second optical parametric oscillator (OPO2) has a bandwidth which is smaller than the spacing of the only one longitudinal mode is excited and coupled into the third optical parametric amplifier medium (K 3 , K 4 ) and amplified therein.
47 citations
TL;DR: In this paper, the Doppler shift was measured by saturation spectroscopy as a test of the time dilatation factor γ = (1 −β2)−1/2 at an ion velocity ofυ = 6.4% c.
Abstract: Laser spectroscopy at the heavy ion storage ring TSR in Heidelberg allows for precision experiments testing the limits of the special theory of relativity. With an opticalΛ-type three-level system of7Li+ the Doppler shift has been measured by saturation spectroscopy as a test of the time dilatation factor γ = (1 −β2)−1/2 at an ion velocity ofυ = 6.4% c. A precision ofΔν/ν < 9 × 10−9 has been obtained, which sets a second-order limit of 1.1 × 10−6 for any deviation from the time dilatation factor. The fourth-order limit of this deviation is set below 2.7 × 10−4 by the present experiment. These limits are given at a 1 σ confidence level.
40 citations
TL;DR: Two-step resonant laser-stimulated recombination of highly charged ions was performed for the first time and provides access to detailed Rydberg spectroscopy in an electron beam environment.
Abstract: Two-step resonant laser-stimulated recombination of highly charged ions was performed for the first time. Nd:YAG laser pulses overlapped with an Ar[sup 18+] beam in the electron cooler of the ESR storage ring at GSI induced transitions from the continuum to the [ital n]=81 state of hydrogenlike Ar[sup 17+]. To avoid reionization in the bending magnet before reaching the detector, the [ital n]=81 population was transferred to a state well below the reionization threshold by a Ti:sapphire laser. Tuning of this laser yielded the [ital n]=81 to 36 and 37 transition-line profiles. The two-step method provides access to detailed Rydberg spectroscopy in an electron beam environment.
28 citations
TL;DR: In this paper, the first time precision spectroscopy on a coasting fast 7Li+ ion beam in a storage ring was performed, where the ion beam moving with 6.4% speed of light was first electron cooled and then merged with two counter-propagating laser beams acting on two different hyperfine transitions sharing a common upper level.
Abstract: We have performed for the first time precision spectroscopy on a coasting fast7Li+ ion beam in a storage ring. The ion beam moving with 6.4% speed of light was first electron cooled and then merged with two counterpropagating laser beams acting on two different hyperfine transitions sharing a common upper level (λ-system). One laser was frequency locked to thea
3
127J2 hfs frequency component established as a secondary frequency standard at 514 nm. The second laser was tuned over theλ-resonance, which was recorded relative to127J2 hfs components. This experiment is sensitive to the time dilation in fast moving frames and will lead to new limits for the verification of special relatively. The present status of the experiment and perspectives in accuracy are discussed.
18 citations
Cited by
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TL;DR: In this article, the authors present a review of the application of atomic physics to address important challenges in physics and to look for variations in the fundamental constants, search for interactions beyond the standard model of particle physics and test the principles of general relativity.
Abstract: Advances in atomic physics, such as cooling and trapping of atoms and molecules and developments in frequency metrology, have added orders of magnitude to the precision of atom-based clocks and sensors. Applications extend beyond atomic physics and this article reviews using these new techniques to address important challenges in physics and to look for variations in the fundamental constants, search for interactions beyond the standard model of particle physics, and test the principles of general relativity.
1,077 citations
TL;DR: In this article, a theoretical evaluation of the vacuum polarization and self-energy radiative corrections to electron binding energies in heavy atoms is given, and the calculations are done to all orders in the strength of the external field of the nucleus Zα.
297 citations
TL;DR: The two-time Green's function method in quantum electrodynamics of high-Z few-electron atoms is described in detail in this paper, where a simple procedure for deriving formulas for the energy shift of a single level and for the energies and wave functions of degenerate and quasi-degenerate states is presented.
243 citations
Journal Article•
TL;DR: In this paper, the authors used laser frequency-locking techniques to obtain an extremely sensitive readout of the length of a stable "etalon of length" of a given length.
Abstract: Extremely sensitive readout of a stable "etalon of length" is achieved with laser frequency-locking techniques. Rotation of the entire electro-optical system maps any cosmic directional anisotropy of space into a corresponding frequency variation. We found a fractional length change $\frac{\ensuremath{\Delta}l}{l}=(1.5\ifmmode\pm\else\textpm\fi{}2.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$, with the expected ${P}_{2}(cos\ensuremath{\theta})$ signature. This null result represents a 4000-fold improvement on the best previous measurement of Jaseja et al.
229 citations
TL;DR: In this article, a review discusses how a variety of ion species and transitions may optimally be used to target new applications, and presents routes to handle them in the laboratory, as well as how to handle ion species for precision spectroscopy and accurate clocks.
Abstract: Electronic states of highly charged ions show magnified fine-structure, Lamb shift, and hyperfine effects making them sensitive probes of bound-state quantum electrodynamics and nuclear physics. Being also impervious to external perturbations renders them ideal candidates for precision spectroscopy and accurate clocks that could test physics beyond the standard model. This review discusses how a variety of ion species and transitions may optimally be used to target such new applications, and presents routes to handle them in the laboratory.
197 citations