Browsing by Subject "GROUP-VELOCITY"

Now showing items 1-9 of 9

    • Buffer-gas-induced absorption resonances in Rb vapor RID B-9041-2008 
      Mikhailov, E. E.; Novikova, I.; Rostovtsev, Y. V.; Welch, George R. (American Physical Society, 2004)
      We observe transformation of the electromagnetically induced transparency (EIT) resonance into an absorption resonance in a Lambda interaction configuration in a cell filled with Rb-87 and a buffer gas. This transformation ...
    • Coherent control of the Goos-Hanchen shift 
      Ziauddin, Qamar S.; Qamar, Sajid; Zubairy, M. Suhail (American Physical Society, 2010)
      The behavior of the Goos-Hanchen (GH) shifts in the reflected and transmitted light beam which is incident on a cavity containing an intracavity medium of three-level or four-level atoms with electromagnetically induced ...
    • Enhancement of magneto-optic effects via large atomic coherence in optically dense media RID B-9041-2008 
      Sautenkov, V. A.; Lukin, M. D.; Bednar, CJ; Novikova, I.; Mikhailov, E.; Fleischhauer, M.; Velichansky, V. L.; Welch, George R.; Scully, Marlan O. (American Physical Society, 2000)
      We utilize the generation of large atomic coherence in optically dense media to enhance the resonant nonlinear magneto-optic effect by several orders of magnitude, thereby eliminating power broadening and improving the ...
    • Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas RID B-9041-2008 
      Mikhailov, E. E.; Sautenkov, V. A.; Novikova, I.; Welch, George R. (American Physical Society, 2004)
      We experimentally study the group time delay for a light pulse propagating through hot Rb-87 vapor in the presence of a strong coupling field in a Lambda configuration. We demonstrate that the ultraslow pulse propagation ...
    • Manipulation of the Raman process via incoherent pump, tunable intensity, and phase control 
      Wang, Li-Gang; Qamar, Sajid; Zhu, Shi-Yao; Zubairy, M. Suhail (American Physical Society, 2008)
      We present a proposal to manipulate the Raman process via incoherent pump, tunable intensity, and phase control of the driving fields. It is found that Raman absorptive peaks can become Raman gain peaks by controlling the ...
    • Nonlinear optics via double dark resonances 
      Yelin, S. F.; Sautenkov, V. A.; Kash, M. M.; Welch, George R.; Lukin, M. D. (American Physical Society, 2003)
      Double dark resonances originate from a coherent perturbation of a system displaying electromagnetically induced transparency. We experimentally show and theoretically confirm that this leads to the possibility of extremely ...
    • Optically controlled delays for broadband pulses 
      Sun, Q. Q.; Rostovtsev, Y. V.; Dowling, J. P.; Scully, Marlan O.; Zubairy, M. Suhail (American Physical Society, 2005)
      We propose a scheme that provides large controllable delays for broadband optical pulses. The system is based on the steep dispersion of a coherently driven medium, in which the narrow electromagnetically induced transparency ...
    • Quantum search protocol for an atomic array 
      Scully, Marlan O.; Zubairy, M. Suhail (American Physical Society, 2001)
      Quantum computers can, in principle, exceed the speed of ordinary computers by taking advantage of quantum coherence and entanglement. It is possible to find a "needle in a haystack" of N-1 straws in only rootN searches ...
    • Tunable phase control for subluminal to superluminal light propagation 
      Sahrai, M.; Tajalli, H.; Kapale, KT; Zubairy, M. Suhail (American Physical Society, 2004)
      We demonstrate tunable control of the group velocity of a weak probe pulse from subluminal to superluminal. The model is an extended Lambda-type system with two extra control fields and an extra energy level. Phase variation ...