Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Analysis on optical pulse propagation in atomic medium for amplification without inversion

밀도 반전 없는 증폭 매질에서 광펄스 군속도의 제어 과정 분석

  • Kim, Haeng-Hwa (Department of Physics Education, Korea National University of Education) ;
  • Kim, Kyung-Dae (Department of Physics Education, Korea National University of Education) ;
  • Lee, Rim (Department of Physics Education, Korea National University of Education) ;
  • An, Moon-Hee (Department of Physics Education, Korea National University of Education) ;
  • Kim, Joong-Bok (Department of Physics Education, Korea National University of Education)
  • 김행화 (한국교원대학교 물리교육과) ;
  • 김경대 (한국교원대학교 물리교육과) ;
  • 이림 (한국교원대학교 물리교육과) ;
  • 안문희 (한국교원대학교 물리교육과) ;
  • 김중복 (한국교원대학교 물리교육과)
  • Published : 2003.10.01
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Abstract

We have analyzed theoretically optical pulse propagation in a coherent atomic medium for amplification without inversion (AWI), which is achieved by adding incoherent optical pumping to a typical EIT system. In order to explain experimental results [Kim et al., J. Phys. B, 36, 2671(2003)] to control the group velocity of the optical pulse by changing pumping power, we established a 5-level atomic system and applied density matrix equations. This AWI model system is different from previous AWI systems from the viewpoint of using two levels for incoherent optical pumping isolated optically from the EIT (electromagentically induced transparency) system so that more atoms can participate in pulse speed control. We have found that population transfer by collisions between ground states plays a decisive role for efficient AWI, and more atoms are effective for slowing the pulse. Our numerical results are in good agreement qualitatively with experimental results.

EIT 구도에 비결맞음 광펌핑(incoherent optical pumping) 과정을 더하여 구성된 밀도 반전 없는 광증폭(Amplification without inversion; AWI)매질에서 광펄스의 전파 과정에 대한 이론적인 분석을 실시하였다 펌핑광의 세기를 변화시킴으로써 광펄스의 군속도를 제어할 수 있음을 실험적으로 관측한 논문[Kim et al., J. Phys. B, 36 (2003)]을 이론적으로 설명하기 위차여 5 준위 원자계를 모형으로 선택하여 밀도행렬방정식을 적용하였다. 특히,본 연구에서 분석한 AWI 구도는 지금까지 연구되어 온 구도와 달리 EIT 구도 밖의 독립적인 에너지 준위들 사이의 전이선을 이용함으로써 보다 많은 원자들이 상호작용에 기여할 수 있는 구도이다. AWI증폭 효율에 결정적인 영향을 미치는 것은 바닥 준위 사이의 충돌에 의한 밀도 전이가 주요하다는 사실을 확인할 수 있었으며, 보다 많은 원자들을 상호작용에 참여시킴으로써 광펄스의 속도를 효과적으로 조절할 수 있음이 수치해석 결과를 통해 밝혔고. 이는 실험 결과와 정성적으로 일치함을 알 수 있었다.

Keywords

References

  1. J. Phys. B v.36 no.12 Slow light propagation in an atomic vapor under conditions of amplification without inversion K.Kim,Feng Xiao;C.Lee;S.K.Kim;X.Chen;B.Kim https://doi.org/10.1088/0953-4075/36/12/321
  2. Wave Propagation and Group Velocity L.D.Brillouin
  3. Progress in Optics v.37 Tunneling Times and Superluminality R.Y.Chiao;A.M.Steinberg
  4. Phys. Rev. Lett v.71 no.5 Measurement of the single-photon tunneling time A.M.Steinberg;P.G.Kwiat;R.Y.CHiao https://doi.org/10.1103/PhysRevLett.71.708
  5. Phys. Rev. A. v.1 no.2 Propagation of a Gaussian Light Pulse through an Anomalous Dispersion Medium C.G.B.Garrett;D.E.McCumber https://doi.org/10.1103/PhysRevA.1.305
  6. Phys. Rev. Lett. v.83 no.21 Steep Anomalous Dispersion in Coherentily Prepared Rb Vapor A.M.Akulshin;S.Barreiro;A.Lezama https://doi.org/10.1103/PhysRevLett.83.4277
  7. Natrue v.406 no.6793 Gain-assisted superluminal light propagation L.J.Wang;A.Kuzmich;A.Dogariu https://doi.org/10.1038/35018520
  8. Phys. Today v.50 no.7 Electromagnetically Induced Transparency S.E.Harris
  9. Phys. Rev. Lett. v.74 no.5 Measurement of Dispersive Porperties of Electromagnetically Inducec Transparency in Rubidium Atoms M.Xiao;Y.Li;S.Jin;J. Gea-Banacloche https://doi.org/10.1103/PhysRevLett.74.666
  10. Phys. Rev. Lett v.74 no.13 Electromagnetically Induced Transparency: Propagation Dynamics A.Kasapi;M.Jain;G.Y.Yin;S.E.Harris https://doi.org/10.1103/PhysRevLett.74.2447
  11. Nature v.397 no.6720 Light speed reduction to 17 metres per second In an ultrecold atomic gas L.V.Hau;S.E.Harris;Z.Dutton;C.H.Behroozi https://doi.org/10.1038/17561
  12. Nature v.409 no.6819 Observation of coherent optical information storage in an atomic medium using haited light pulses C.Liu;Z.Dutton;C.H.Behroozi;L.V.Hau https://doi.org/10.1038/35054017
  13. Phys. Rev. Lett. v.86 no.5 Storage of Light in Atomic Vapor D.F.Phillips;A.Fleischhauer;A.Mair;R.L.Walswortr https://doi.org/10.1103/PhysRevLett.86.783
  14. Phys. Rev. Lett. v.88 no.2 Observation c UItraslow and Stored Light Pulses in a Solid A.V.Turukhin;V.S.Sudarsshanam;M.S.Shahriar;J.A.Musser;B.S.Ham;P.R.Hemmer https://doi.org/10.1103/PhysRevLett.88.023602
  15. Phys. Rev. Lett v.86 no.16 Superluminal to Subluminal Transition in the Pulse Propagation ir a Resonantly Absorbing Medium Md.A.I.Talukder;Y.Amagishi;M.Tomita https://doi.org/10.1103/PhysRevLett.86.3546
  16. Phys. Rev. Lett v.89 no.23 Control of Light Pulse Propagation with Only a Few Cold Atoms in a High-Finesse Microcavity Y.Shimizu;N.Shiokawa,N.Yamamoto;M.Kozuma;T.Kuga https://doi.org/10.1103/PhysRevLett.89.233001
  17. Phys. Rev. A. v.64 no.5 Knob for changing liht propagation form subluminal to superluminal G.S.Agawal;T.N.Dey;S.Menon https://doi.org/10.1103/PhysRevA.64.053809
  18. Phys. Rev. A. v.68 Observation of arbitrary group velocities of light from superluminal to subliminal on the single atomic transition line K.Kim;H.S.Moon;C.Lee;S.K.Kim;J.B.Kim https://doi.org/10.1103/PhysRevA.68.013810
  19. 새물리 결맞는 원자 매질에서 광펄스의 전파 김경대;김행화;이충희;김수경;권미랑;김중복
  20. A. M. Akulshin, A. Cimmino, A. I. Sidorov, P. Hannaford, and G. I. Opat, “Light propagation in an atomic medium with steep and sign-reversible dispersion,” Phys. Rev. A, vol. 67, no. 1, pp. 011801(R), 2003. https://doi.org/10.1103/PhysRevA.67.011801
  21. G. S. Agawal, T. N. Dey, and S. Menon, “Knob for changing light propagation from subluminal to superluminal,” Phys. Rev. A, vol. 64, no. 5, pp. 053809, 2001. https://doi.org/10.1103/PhysRevA.64.053809
  22. K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subliminal on the single atomic transition line,” Phys. Rev. A, vol. 68, pp. 013810, 2003. https://doi.org/10.1103/PhysRevA.68.013810
  23. 김경대, 김행화, 이충희, 김수경, 권미랑, 김중복, "결맞는 원자 매질에서 광펄스의 전파," 샘룰리,2004