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Institut für Quantenoptik Home Profile Education News & Events Workshops & Conferences Atom Optics and Quantum Sensors Molecules & Lasers Ultrafast Laser Optics Quantum Metrology Applied Laser Physics Molecular Quantum Gases Trapped-Ion Quantum Engineering 523. WE Heraeus-Seminar 508. WE Heraeus-Seminar Workshop »Continuous Sources of Quantum Matter« ICOLS 2011 ICOLS Student Workshop 2011 Leibniz Universität Hannover	Evolutionary optimization of an experimental apparatus We have developed an optimization algorithm which is well-suited to automatically optimize the parameters of an experimental apparatus. date: 29. May 2013 Published: "Interferometry with Bose-Einstein Condensates in Microgravity" H. Müntinga et al. date: 09. April 2013 Interdisciplinary cooperation: thrombosis in the aorta A numerical model of the blood flow explains the development of thrombi in the aortic arch. date: 18. July 2012 New publication: "Two-photon polymerization technique with sub-50 nm resolution by sub-10 fs laser pulses", M. Emons, et. al., Opt. Mat. Express, Vol. 2, pp. 942-947 (2012) date: 21. June 2012 New Publication: Self-alignment of a compact large-area atomic Sagnac interferometer New Journal of Physics, 14 015002 (2012) doi:10.1088/1367-2630/14/1/015002 The relative alignment of the three spatially seperated beam-splitter light zones is a milestone to high resolution rotation measurements in the cold atom gyroscope CASI. This publication describes the high alignment demands and presents an alignment pocedure utilising the atom interferometer itself in different topologies to meet this challenge. date: 23. January 2012 Entangled matter waves for sub-shot-noise interferometry B. Lücke et al., Science, 13 October 2011 date: 14. October 2011 Novel route to stable and compact atom clocks Long coherence times of up to 21 s can be achieved in trapped atomic ensembles. PRL 106, 240801 (2011). date: 22. June 2011 New publication: "High-order harmonic generation directly from a filament", New J. Phys. 13: 043022 (2011) date: 15. April 2011 New publication: "Superresolved femtosecond laser nanosurgery of cells"; Biomedical Optics Express 2, No. 2, pp. 264- 270 (2011) We report on femtosecond nanosurgery of fluorescently labeled structures in cells with a spatially superresolved laser beam. The focal spot width is reduced using phase filtering applied with a programmable phase modulator. A comprehensive statistical analysis of the resulting cuts demonstrates an achievable average resolution enhancement of 30 %. date: 31. March 2011 Published: "Simple method for generating Bose-Einstein condensates in a weak hybrid trap" We report on a simple trapping scheme for the generation of Bose-Einstein condensates of 87Rb atoms. This scheme employs a near-infrared single-beam optical dipole trap combined with a weak magnetic quadrupole field as used for magneto-optical trapping to enhance the confinement in axial direction. Efficient forced evaporative cooling to the phase transition is achieved in this weak hybrid trap via reduction of the laser intensity of the optical dipole trap at constant magnetic field gradient. The article was published in Phys. Rev. A 83, 035601 (2011) date: 19. March 2011 New publication: "Multi-μJ, CEP-stabilized, two-cycle pulses from an OPCPA system with up to 500 kHz repetition rate", Optics Express 18, Issue 26, pp. 27291- 27297 We present a two-stage OPCPA system based on a Ti:sapphire seed and a thin-disk regenerative amplifier producing compressed pulse energies of more than 3 μJ and durations of less than 6 fs at a high repetition rate of 143 kHz. In combination with the obtained CEP stability and the repetition rate scalability between 100 and 500 kHz the system forms an ideal tool for high field and phase sensitive spectroscopic experiments. more date: 20. January 2011 New publication: "12 MW peak power from a two-crystal Yb:KYW chirped-pulse oscillator with cavity-dumping" Optics Express 18 , pp. 19095-19100 We report on substantial pulse energy increase in Yb:KYW femtosecond laser oscillators by utilizing multiple laser crystals for an enhanced net-gain at higher pump power. The two-crystal oscillator generates pulse energies of 7 µJ at 1 MHz repetition rate which is, to our knowledge the highest energy ever reported from an Yb-doped tungstate fs-laser oscillator. The external pulse compression yields a pulse duration of 416 fs with a peak power of 12 MW being enough for stable white light generation in YAG. more date: 19. January 2011 YAO 2011 The YAO 2011 will be hosted by the IQ date: 29. December 2010 Published: "Degenerate Quantum Gases in Microgravity" Clouds of ultra-cold atoms and especially Bose–Einstein condensates (BEC) provide a source for coherent matter-waves in numerous earth bound experiments. Analogous to optical interferometry, matter-wave interferometers can be used for precision measurements allowing for a sensitivity orders of magnitude above their optical counterparts. However, in some respects the presence of gravitational forces in the lab limits experimental possibilities. In this article, we report about a compact and robust experiment generating Bose–Einstein condensates in the drop tower facility in Bremen, Germany. We ... date: 20. November 2010 Published: Spontaneous Breaking of Spatial and Spin Symmetry in Spinor Condensates Phys. Rev. Lett. 105, 135302 (2010) date: 22. September 2010 New publication We demonstrate the trapping of cold atoms by continuously loading a dipole trap of millikelvin-hot atoms via opening a loss channel to the dipoletrap. Here, only the coldest atoms can be trapped at temperatures in the µK. "Beating the density limit by continuously loading a dipole trap from millikelvin-hot magnesium atoms", M. Riedmann et al., Phys. Rev. A 86, 043416 (2012) date: 16. September 2010 Published: "Bose-Einstein Condensation in Microgravity“ Science 18 June 2010 Wissenschaftlern des Projekts QUANTUS (Quantengase unter Schwerelosigkeit) ist es gelungen, eine Apparatur zur Erzeugung von Bose-Einstein-Kondensaten unter Bedingungen der Schwerelosigkeit zu entwickeln. Wie das Wissenschaftsmagazin Science in seiner neuesten Ausgabe berichtet, erlaubt diese Apparatur im freien Fall ein atomares Wellenpaket zu generieren und dessen Entstehung zu einem Objekt von Millimetergröße über eine Sekunde lang zu verfolgen. Die Wissenschaftler haben damit eine vielversprechende und sehr robuste Quelle für Materiewellen entwickelt, die ... date: 18. June 2010 Published: Parametric amplification of vacuum fluctuations Phys. Rev. Lett. 104, 195303 (2010) date: 10. June 2010 Published: Multi-resonant spinor dynamics in a Bose-Einstein condensate Phys. Rev. Lett. 103, 195302 (2009) date: 08. December 2009 Publication submitted: Multi-resonant Spinor dynamics We have just submitted a new publication about spin dynamics in a Bose-Einstein condensate (BEC). The publication presents the first investigation of magnetic field dependent resonances in unstable spin configurations of a BEC with non-zero spin. http://arxiv.org/abs/0902.2058 date: 23. September 2009 Displaying results ###SPAN_BEGIN###%s to %s out of ###SPAN_BEGIN###%s << First < Previous 1-20 21-21 Next > Last >>
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