Continuous-wave Lyman-α generation with solid-state lasers

Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55128 Mainz, Germany.
Optics Express (Impact Factor: 3.49). 08/2009; 17(14):11274-80. DOI: 10.1364/OE.17.011274
Source: PubMed


A coherent continuous-wave Lyman-alpha source based on four-wave sum-frequency mixing in mercury vapor has been realized with solid-state lasers. The third-order nonlinear susceptibility is enhanced by the 6(1)S - 7(1)S two-photon resonance and the near 6(1)S-6(3)P one-photon resonance. The phase matching curve for this four-wave mixing scheme is observed for the first time. In addition we investigate the two-photon enhancement of the Lyman-alpha yield and observe that the maxima of Lyman-alpha generation are shifted compared to the two-photon resonances of the different isotopes.

Download full-text


Available from: Daniel Kolbe, Jul 02, 2014
  • Source
    • "(3.) Saturation has been observed by changing the fundamental powers and measuring the change in FWM efficiency. (No such saturation was observed in earlier experiments [14] [15] because they were at much larger VUV detunings.) Saturation contributes a factor of 1.4. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Efficient continuous-wave four-wave mixing by using three different fundamental wavelengths with individual detunings to resonances of the nonlinear medium is shown. Up to 6 �µW of vacuum ultraviolet light at 121nm can be generated, which corresponds to an increase of three orders of magnitude in efficiency. This opens the field of quantum information processing by Rydberg entanglement of trapped ions.
    Full-text · Article · Aug 2012 · Physical Review Letters
  • Conference Paper: Antihydrogen
    [Show abstract] [Hide abstract]
    ABSTRACT: Future precision experiments with trapped cold antihydrogen promise to provide extremely stringent tests of the fundamental symmetry between matter and antimatter (CPT symmetry) in the hadron as well as in the lepton sector. Ultrahigh-resolution Doppler-free two-photon laser-spectroscopy of ordinary hydrogen and antihydrogen might be used to compare matter and antimatter at unprecedented levels of experimental precision. In addition, there is the fascinating prospect to directly observe the gravitational force on antimatter, because antihydrogen is a pure antimatter system which is both stable and electrically neutral. For both types of experiment it is essential to cool the antihydrogen atoms. Laser-cooling of antihydrogen can be done on the transition from the 1S ground state to the 2P excited state (Lyman-alpha) at a wavelength of 122 nm in the Vacuum-Ultraviolet. Continuous coherent radiation at this wavelength can be produced by four- wave sum-frequency mixing in mercury vapour. First experiments used three argon-ion-lasers, one of which was frequency-doubled in an external cavity (257 nm wavelength), the second one was used to pump a dye-laser (545 nm wavelength) and the third one was used to pump a titanium: sapphire laser, again with external frequency doubling (399 nm wavelength). Future laser-cooling of antihydrogen, however, requires reliable Lyman-alpha generation in the beam-time environment of an accelerator facility. We have thus set out to replace the dye laser and the argon-ion laser. Recent first results from a second-generation continuous-wave Lyman-alpha source, based on solid-state lasers, will be discussed. Current antihydrogen experiments use the Antiproton Decelerator (AD) at CERN and this talk will review the status of the ATRAP experiment. An exciting new horizon is FLAIR, the Facility for Low-Energy Antiproton and Ion Research. This is a next-generation low-energy antiproton source that will make use of the high flux of antiprotons at the - upcoming international FAIR research center near GSI/Darmstadt.
    No preview · Conference Paper · Jul 2009
  • [Show abstract] [Hide abstract]
    ABSTRACT: Two-photon laser spectroscopy of the 6 1S0−7 1S0 transition in mercury has been performed using two copropagating continuous-wave laser beams. One laser beam is at 254 nm wavelength and can be tuned to the 6 1S0−6 3P1 resonance. The other laser beam is at 408 nm. Two very different regimes can be distinguished, one far off resonance and one near resonance with the one-photon resonance. A resonance which is not Doppler broadened has been observed for low Rabi frequencies. This velocity-selective double resonance in a three-level ladder system is analogous to the dark resonance in three-level Λ systems.
    No preview · Article · Nov 2009 · Physical Review A
Show more