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Conference on Lasers and Electro-Optics

Temporal shape of free-induction-decay signals: single-event studies

William Randall Babbitt, Yu Bai, THOMAS W. MOSSBERG

Published Jan 1, 1986• 0 citations
Publisher

Abstract

It has been pointed out that inhomogeneously broadened absorbers can remember and be stimulated to reproduce, through the emission of free-induction-decay signals, the temporal shapes of laser pulses to which they have been exposed,1 This process possesses a certain intrinsic novelty and may also represent an alternative approach to realizing frequency-selective optical data storage.2

DOI
10.1364/cleo.1986.wi5

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It has been pointed out that inhomogeneously broadened absorbers can remember and be stimulated to reproduce, through the emission of free-induction-decay signals, the temporal shapes of laser pulses to which they have been exposed,1 This process possesses a certain intrinsic novelty and may also represent an alternative approach to realizing frequency-selective optical data storage.2
We have performed an experiment in atomic Yb vapor which provides the first demonstration that complex laser pulse-shape information can be stored in and recalled from the spectral distribution of the population in one terminal level of an inhomogeneously broadened optical transition. The information is stored as a result of interference between two temporally separated laser excitation pulses, one of which possesses a complex temporal structure. It is recalled as a feature of a third-excitation-pulse-induced free-decay signal. Recalled signals up to one percent as intense as the original were observed.
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Time-and-space-domain holography [1,2] by stimulated photon echoes [3] provides a means of storing temporal and spatial properties of an ultrafast-varying light signal and recalling its authentic replica at any later moment. The possibility of recording complex time shapes of light pulses, which also means time-domain optical data storage, is based on the ability of frequency-selective absorbers to store with high accuracy the temporal Fourier components of the incident light [1-3]. The time-domain frequency-selective optical storage of binary or analog data is an alternative approach to the concept of frequency-selective high-density data storage that provides a parallel ultrafast data storage and processing in the frequency domain. The shortest detail of the signal to be stored is limited by the reverse inhomogeneous bandwidth of the storing media which reaches 10-100 fs for frequency-selective materials while the duration of the signal is limited by phase relaxation time T2 (usually 10−9-10−6s).