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Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals

Optical Spectral Holeburning with Raman Coherent Population Trapping

Philip Hemmer, M. S. Shahriar, Byoung Seung HAM, M. K. Kim, Yu. Rozhdestvensky

Published Dec 1, 1996• 4 citations
Publisher

Abstract

Optical spectral holeburning is examined for the case when two-frequency Raman resonant laser excitation is used in place of conventional single frequency excitation. It is found that Raman coherent population trapping can be used to increase storage capacity beyond the limit given by the ratio of optical inhomogeneous to homogeneous linewidths. This is possible because Raman population trapping provides an additional storage dimension. Theoretical analysis and practical issues are presented.

DOI
10.1080/10587259608042758

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Optical spectral holeburning is examined for the case when two-frequency Raman resonant laser excitation is used in place of conventional single frequency excitation. It is found that Raman coherent population trapping can be used to increase storage capacity beyond the limit given by the ratio of optical inhomogeneous to homogeneous linewidths. This is possible because Raman population trapping provides an additional storage dimension. Theoretical analysis and practical issues are presented.
Under this grant, we have studied Raman coherent population trapping in a solid, with applications to five dimensional optical data storage. In particular, we have studied Raman spectral holeburning in Pr:YSO, which has properties suitable for optical data storage. During this period, we have made significant advances in our pursuit towards storage of optical information in this medium. In addition, we have stored and retrieved optical images in two amorphous hosts: polystyrene doped with the dye chlorin-e6, and polymethylmethalacrylate doped with the dye phenanthraquinone The work has resulted in eleven journal publications and 10 conference presentations. The basic results are summarized below.
An efficient broadband optical continua generation due to stimulated Raman scattering originated from relaxation processes from the excited electronic states is predicted. It is shown that, even when the populations of Raman levels are equal, Raman coherence can be efficiently excited due to coherent population trapping process (CPT). Scattering of the electromagnetic field due to the excited coherence gives rise to a comb of equally spaced spectral components of optical radiation. The generated spectrum can be compressed into a sequence of ultrashort pulses. Estimates for realistic parameters of the medium show that it is possible to produce a sequence of femtosecond and even subfemtosecond pulses with repetition rate several GHz.
In addition to its importance for the optical spectroscopy of solids, photochemical spectral hole burning (PSHB) has attracted great interest due to its potential use in high density optical data storage [1]. By encoding information as a function of frequency an enormous increase in storage is possible compared to conventional optical storage materials. The most optimistic estimates predict an increase given by the ratio of the inhomogeneous linewidth to the homogeneous linewidth of the optical transition responsible for hole burning. Until now, however, there have been relatively few investigations of the practical limitations to storing a large number of spectral holes [2,3]. We describe here a recent experiment in which 2000 grayscale images were successfully recorded as holograms in the PSHB material chlorin in polyvinylbutyral. In holographic spectral hole burning the relative phase of the interfering light waves used to prepare the hologram has a strong influence on diffraction properties and, hence, on crosstalk between adjacent holograms [4]. By controlling the phase and frequency during burning in a novel manner, we have minimized crosstalk between the stored images.
We discuss the use of electromagnetically modified absorption to achieve selective excitation in atoms: that is, the laser excitation of one transition while avoiding simultaneously exciting another transition whose frequency is the same as or close to that of the first. The selectivity which can be achieved in the presence of coherent population trapping (CPT) is limited by the decoherence rate of the dark state. We present exact analytical expressions for this effect, and also physical models and approximate expressions which give useful insights into the phenomena. When the laser frequencies are near-resonant with the single-photon atomic transitions, CPT is essential for achieving discrimination. When the laser frequencies are far detuned, the ``bright'' two-photon Raman resonance is important for achieving selective excitation, while the ``dark'' resonance (CPT) need not be. The application to laser cooling of a trapped atom is also discussed.
Summary form only given.Optical spectral hole-burning has demonstrated the ability to achieve high-capacity, high-speed data storage. Unfortunately, widespread application of this technique has been limited by the requirement for low temperature operation. To circumvent this problem, we have been investigating the possibility of using Raman-excited spin coherences to store and recall optical data. The motivation is that optical Raman excitation allows storage densities and response times characteristic of optical hole-burning memories, but because it is based on long-lived spin coherences, it can maintain these characteristics at much higher operating temperatures. For the initial experiments we chose to use N-V color centers in diamond as the Raman hole-burning material because it is comparatively well studied.