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Title: Efficient generation of a narrow-bandwidth and frequency-modulated beam pair from Yb atoms in a ladder configuration

We report on the generation of narrow-bandwidth and frequency-modulated cascaded emission of two photons from a collimated Yb atomic beam. Efficient population transfer from the ground state (6s{sup 2} {sup 1}S{sub 0}) to upper state (6s7s {sup 1}S{sub 0}), of which direct transition at 291.1 nm is dipole forbidden, is achieved through a resonant two-photon excitation enhanced by the electromagnetically induced transparency mediated by the intermediate state (6s6p {sup 1}P{sub 1}). Then cascaded emission of two photons with a bandwidth of 54 MHz at 611.3 nm (idler) and 555.8 nm (signal) occurs in sequence from the upper state via the spin triplet state (6s{sup 2} {sup 3}P{sub 1}). Numerical calculations of the density matrix equations taking into account the residual Doppler effect and strong driving fields successfully explain the experimental results for the idler and signal beam intensities depending on the various parameters of the driving fields. Synchronized optical switching and frequency-modulation characteristics of the idler and signal beams are also reported.
Authors:
;  [1]
  1. Department of Physics, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21541371
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 83; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.83.033814; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ATOMIC BEAMS; DENSITY MATRIX; DOPPLER EFFECT; EXCITATION; FREQUENCY MODULATION; GROUND STATES; INTERMEDIATE STATE; LEVEL WIDTHS; MHZ RANGE; OPACITY; PHOTON EMISSION; PHOTONS; POPULATION INVERSION; SIGNALS; SPIN; TRIPLETS; YTTERBIUM ANGULAR MOMENTUM; BEAMS; BOSONS; ELEMENTARY PARTICLES; ELEMENTS; EMISSION; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; FREQUENCY RANGE; MASSLESS PARTICLES; MATRICES; METALS; MODULATION; MULTIPLETS; OPTICAL PROPERTIES; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; RARE EARTHS