A new echo phenomenon in laser induced population grating in gases - LIPG echo

Yukio Fukuda, Koichi Yamada, Tsuneo Hashi

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1 Citation (Scopus)


We report the observation of a new type of echo produced by applying two intersecting light pulses with different angles (θ and θ′) at t = 0 and τ. The laser induced population grating (LIPG) created by the first excitation and degraded due to the thermal motion of atoms is reformed by the second excitation at te= τ+mτ (αn-M), where m and n are integers and α sin ( θ 2)=sin ( θ′ 2). The experiment was performed in the ground state 3 2S 1 2 of atomic sodium vapor. This echo is not related to the atomic coherence but to the population distribution, and has novel feature for studying velocity-changing collisions.

Original languageEnglish
Pages (from-to)299-302
Number of pages4
JournalOptics Communications
Issue number4
Publication statusPublished - 1981 May 15


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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