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- Heung-Ryoul Noh, Han Seb Moon
- Optics express
- 2011

We present discrimination of the effect of one-photon and two-photon coherences in electromagnetically induced transparency for a three-level ladder-type atomic system. After the optical Bloch equations for a three-level atom, with either cycling or non-cycling transitions, were solved numerically, the solutions were averaged over the velocity distribution… (More)

- Kihwan Kim, Myoung-Sun Heo, +4 authors Wonho Jhe
- Physical review letters
- 2006

We have observed spontaneous symmetry breaking of the population of Brownian particles between two moving potentials in the spatiotemporally symmetric system. Cold atoms preferentially occupy one of the dynamic double-well potentials, produced in the parametrically driven dissipative magneto-optical trap far from equilibrium, above a critical number of… (More)

- Heung-Ryoul Noh
- Symmetry
- 2016

We present an analytical calculation of temporal evolution of populations for optically pumped atoms under the influence of weak, circularly polarized light. The differential equations for the populations of magnetic sublevels in the excited state, derived from rate equations, are expressed in the form of inhomogeneous second-order differential equations… (More)

- Yoon-Seok Lee, Heung-Ryoul Noh, Han Seb Moon
- Optics express
- 2015

We investigated the relationship between two- and three-photon coherence in terms of the transition routes and coupling field intensities in a Doppler-broadened ladder-type atomic system for the 5S(1/2)-5P(3/2)-5D(5/2) transition in (87)Rb atoms. Three-photon electromagnetically induced absorption (TPEIA) due to three-photon coherence was observed in the… (More)

- Han Seb Moon, Heung-Ryoul Noh
- Optics express
- 2013

We have experimentally and theoretically studied resonant two-photon absorption (TPA) and electromagnetically induced transparency (EIT) in the open ladder-type atomic system of the 5S(1/2) (F = 1)-5P(3/2) (F' = 0, 1, 2)-5D(5/2) (F″ = 1, 2, 3) transitions in (87)Rb atoms. As the coupling laser intensity was increased, the resonant TPA was transformed to EIT… (More)

- Heung-Ryoul Noh
- Optics express
- 2012

We present a theoretical study of lineshape in polarization spectroscopy for the 6S₁/₂-6P₃/₂-7S₁/₂ transition line in cesium atoms. A circularly polarized pump beam is tuned either to the lower or the upper transition line, while a linearly polarized probe beam is tuned to the other transition line. The polarization rotation of the probe beam is accurately… (More)

- Wanhee Lee, Ji-Hyoun Kim, Jong Geun Hwang, Heung-Ryoul Noh, Wonho Jhe
- Physical review. E
- 2016

We observe the hysteresis of a spontaneous symmetry breaking (SSB) transition in a parametrically modulated magneto-optical trap by sweeping the total number of atoms and study thermal hysteretic behavior in the system by measuring the scaling exponent of hysteresis. It is shown that the relaxation time of the order parameter in the SSB transition becomes… (More)

- Geol Moon, Yonghee Kim, +5 authors Wonho Jhe
- Physical review. E, Statistical, nonlinear, and…
- 2011

We investigate the scaling behavior of the relaxation process for an unstable state near a subcritical Hopf bifurcation point. When the parametric modulation is applied to a magneto-optical trap, the atomic cloud becomes unstable and decays to the dynamic bistable states. Near the subcritical Hopf bifurcation point, we experimentally show that the… (More)

- Myoung-Sun Heo, Yonghee Kim, +5 authors Wonho Jhe
- Physical review. E, Statistical, nonlinear, and…
- 2010

We show that an atomic system in a periodically modulated optical trap displays an ideal mean-field symmetry-breaking transition. The symmetry is broken with respect to time translation by the modulation period. We describe experimental observations and develop a full microscopic theory of the observed critical phenomena. The transition is explained as… (More)

- Hyun-Jong Kang, Heung-Ryoul Noh
- Optics express
- 2017

We present a theoretical and experimental study of electromagnetically induced transparency (EIT) in V-type systems of 87Rb atoms. We calculate accurate lineshapes of V-type EIT spectra by solving density matrix equations considering all the magnetic sublevels involved. The calculated spectra demonstrate consistency with the experimental results. We… (More)