Resonant sequential scattering in two-frequency-pumping superradiance from a Bose-Einstein condensate

Yang, Fan; Zhou, Xianju; Li, Juntao; Chen, Yuankai; Xia, Lin; Chen, Xuzong

doi:10.1103/physreva.78.043611

Cited by 23 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This scheme is widely studied in photon echo (Piovella et al, 2003), decoherence (Fallani et al, 2005), spatial distribution effects and self-organized formation of dynamic gratings (Hilliard et al, 2008). Since the pulse length is far longer than the initial spontaneous process (Zobay & Nikolopoulos, 2006), we choose the semi-classical theory which can well describe the experimental results (Bar-Gill et al, 2007;Yang et al, 2008;Zobay & Nikolopoulos, 2006).…”

Section: High-order Momentum Modes By Resonant Superradiant Scatteringmentioning

confidence: 99%

“…The atoms are recoiled to some discrete momentum states with momentum 2mhk,w h e r em is an integer and the wave vector of e n d -fi r em o d el i g h tk is approximated as k l for energy conservation. The total electric field E(r, t)=E (+) + E (−) is given by (Bar-Gill et al, 2007;Li, Zhou et al, 2008;Yang et al, 2008;Zobay & Nikolopoulos, 2006)…”

Section: Model For a Multiple-frequency End-pumped Beammentioning

confidence: 99%

“…In this case, there is an energy mismatch of four times the one-photon recoil kinetic energyhω r in backward scattering, which then remains very weak unless a short pumping pulse with a broad spectrum is used. Hence, two phase-locked incident lasers with the frequency difference ∆ω compensating for the energy mismatch has been used (Bar-Gill et al, 2007;Cola et al, 2009;Yang et al, 2008), which is named resonant superradiance, where a large number of backward recoiling atoms can be produced.…”

Section: High-order Momentum Modes By Resonant Superradiant Scatteringmentioning

confidence: 99%

See 2 more Smart Citations

High Order Momentum States by Light Wave Scattering

Zhou¹,

Yue²

2012

Interferometry - Research and Applications in Science and Technology

Self Cite

View full text Add to dashboard Cite

Section: High-order Momentum Modes By Resonant Superradiant Scatteringmentioning

confidence: 99%

Section: Model For a Multiple-frequency End-pumped Beammentioning

confidence: 99%

Section: High-order Momentum Modes By Resonant Superradiant Scatteringmentioning

confidence: 99%

See 1 more Smart Citation

High Order Momentum States by Light Wave Scattering

Zhou¹,

Yue²

2012

Interferometry - Research and Applications in Science and Technology

Self Cite

View full text Add to dashboard Cite

“…-Our experiment (see Fig.1) is carried out with a BEC of 2.5 × 10 5 87 Rb atoms in the F = 2, m F = 2 state [12,13]. Obtained after trapping of cold atoms in a QUIC trap (longitudinal trapping frequency ω x = 20 Hz and radial trapping frequency ω r = 200 Hz) and further radio frequency evaporative cooling, our BEC is cigar-shaped, with 70 µm length and 7 µm width.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Mode competition in superradiant scattering of matter waves

et al. 2011

Self Cite

View full text Add to dashboard Cite

Superradiant Rayleigh scattering in a Bose gas released from an optical lattice is analyzed with incident light pumping at the Bragg angle for resonant light diffraction. We show competition between superradiance scattering into the Bragg mode and into end-fire modes clearly leads to suppression of the latter at even relatively low lattice depths. A quantum light-matter interaction model is proposed for qualitatively explaining this result.PACS numbers: 03.75. Gg; 03.75.Hh; 42.50.Nn; 42.50.Gy The coherent nature of Bose-Einstein condensates has led to new and rapid developments in atom optics and studies on coherent interaction between light and matter waves, with the demonstration of efficient matter wave interferometers, Bragg diffraction, wave mixing, matter wave amplifiers. Superradiant scattering was for the first time analyzed using a Bose-Einstein condensate (BEC) in a seminal experiment by Ketterle et al. [1]. In this experiment the initial matter grating, formed due to Rayleigh scattering of a pumping beam by an elongated Bose-Einstein condensate and subsequent recoil into a moving matter wave, was self amplified by resonant light diffraction in a phenomenon called amplification of matter waves. Absorption of pumping photons and preferential scattering into so-called end-fire modes along the BEC's long axis lead to the observation of patterns of coherently recoiling atoms. Amplification of matter waves was further characterized with the use of an initial matter wave seed formed via Bragg diffraction of a Bose condensate and its coherence nature was demonstrated [2,3].For an elongated BEC, superradiant Rayleigh scattering light is emitted along the long axis because the gain for superradiance is maximum in this direction. However, different superradiant modes can be obtained when a matter wave seed with non-zero momentum is created before pumping since light can then be resonantly diffracted in a different direction [4]. No precise analysis of competition between different superradiant scattering modes has been carried out yet. Such analysis would be useful for calibrating precisely superradiance gains and initial Rayleigh scattering rates if one wants to use quantitatively superradiance for the analysis of coherence in Bose gases [5,6]. Analyzing superradiance with non common configurations is also important as combining early stage superradiance described with quantum theory and long timescale superradiance which is well captured within a semi-classical theory taking into account propagation effects is currently a topic of high interest [7,8] We present in this article an experimental analysis of mode competition in superradiance scattering. Rather than relying on an initial matter wave seed formed via Bragg diffraction of a BEC [2-4] our superradiance experiment is performed after initial adiabatic loading of a BEC along its long axis inside a 1D optical lattice [9]. The choice of contra propagating optical beams (wave vector ± k L ) for the optical lattice loading leads to the formation of a matte...

show abstract

Density operator description of atomic ordered spatial modes in cavity QED

Fang

Yang

Chen

et al. 2013

Optics Communications

Self Cite

View full text Add to dashboard Cite

We present a quantum Monte-Carlo simulation for a pumped atom in a strong coupling cavity with dissipation, where two ordered spatial modes are formed for the atomic probability density, with the peaks distributed either only in the odd sites or only in the even ones of the lattice formed by the cavity field. A mixed state density operator model, which describes the coupling between different atomic spatial modes and the corresponding cavity field components, is proposed, which goes beyond the pure state interpretation. We develop a new decomposition treatment to derive the atomic spatial modes as well as the cavity field statistics from the simulation results for the steady state. With this treatment, we also investigate the dynamical process for the probabilities of the atomic spatial modes in the adiabatic limit. According to the analysis of the fitting error between the simulation results and the density operator model, the latter is a good description for the system.

show abstract

Resonant sequential scattering in two-frequency-pumping superradiance from a Bose-Einstein condensate

Cited by 23 publications

References 23 publications

High Order Momentum States by Light Wave Scattering

High Order Momentum States by Light Wave Scattering

Mode competition in superradiant scattering of matter waves

Density operator description of atomic ordered spatial modes in cavity QED

Contact Info

Product

Resources

About