排序方式: 共有30条查询结果,搜索用时 15 毫秒
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I. Shvarchuck K. Dieckmann M. Zielonkowski J.T.M. Walraven 《Applied physics. B, Lasers and optics》2000,71(4):475-480
We report on master-oscillator power amplification using a broad-area laser diode (BAL) emitting at a wavelength of λ =780 nm.
The master oscillator is an injection-locked single-mode diode laser delivering a seeding beam of 35 mW, which is amplified
in double pass through the BAL up to 410 mW. After beam shaping and spatial filtering by a single-mode fibre we obtain a clean
Gaussian beam with a maximum power of 160 mW. There is no detectable contribution of the BAL eigenmodes in the spectrum of
the output light. This laser system is employed for operation of a 87Rb magneto-optical trap (MOT) and for near-resonant absorption imaging in a Bose-Einstein condensation experiment.
Received: 10 April 2000 / Revised version: 13 June 2000 / Published online: 2 August 2000 相似文献
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T.W. Hijmans P.W.H. Pinkse A.P. Mosk M. Weidemüller M.W. Reynolds J.T.M. Walraven C. Zimmermann 《Hyperfine Interactions》2000,127(1-4):175-180
We show that resonant enhanced two photon spectroscopy is a very powerful and promising diagnostic method for trapped atomic
hydrogen and antihydrogen. This method, in which photons of different wavelengths are used to excite H atoms from the 1S to
the 3D or 3S level, uses the resonant enhancement of the intermediate 2P level to obtain high sensitivity while at the same
time offering potentially much higher spectral resolution than single photon (Lyman α) excitation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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We find that in very elongated 3D trapped Bose gases, even at temperatures far below the BEC transition temperature T(c), the equilibrium state will be a 3D condensate with fluctuating phase (quasicondensate). At sufficiently low temperatures the phase fluctuations are suppressed and the quasicondensate turns into a true condensate. The presence of the phase fluctuations allows for extending thermometry of Bose-condensed gases well below those established in current experiments. 相似文献
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We discuss the regimes of quantum degeneracy in a trapped 1D gas and obtain the diagram of states. Three regimes have been identified: the Bose-Einstein condensation (BEC) regimes of a true condensate and quasicondensate, and the regime of a trapped Tonks gas (gas of impenetrable bosons). The presence of a sharp crossover to the BEC regime requires extremely small interaction between particles. We discuss how to distinguish between true and quasicondensates in phase coherence experiments. 相似文献
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Wille E Spiegelhalder FM Kerner G Naik D Trenkwalder A Hendl G Schreck F Grimm R Tiecke TG Walraven JT Kokkelmans SJ Tiesinga E Julienne PS 《Physical review letters》2008,100(5):053201
We report on the observation of Feshbach resonances in an ultracold mixture of two fermionic species, (6)Li and (40)K. The experimental data are interpreted using a simple asymptotic bound state model and full coupled channels calculations. This unambiguously assigns the observed resonances in terms of various s- and p-wave molecular states and fully characterizes the ground-state scattering properties in any combination of spin states. 相似文献