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Conference on Lasers and Electro-Optics

Femtosecond hole burning storage by two-photon absorption

Alex Karotki, Mikhail A. Drobizhev, Alexander Rebane

Published Jan 1, 2001• 1 citation

Abstract

Summary form only given. Spectral hole burning (SHB) is a promising technique for optical recording of information with a potential to store in excess of 10/sup 4/-10/sup 5/ bits per /spl lambda//sup 3/ volume (Moerner, 1988). Highest storage capacity is achieved when frequency- or time-domain addressing is combined with addressing in three spatial dimensions by using a bulk SHB medium. However, so far both bit-by-bit and holographic SHB storage experiments were restricted to two spatial dimensions. This is because focusing a laser beam to a small volume inside the SHB medium is hindered by one-photon absorption in SHB material layers. We propose that this problem may be overcome by burning holes via two-photon absorption (TPA) (Demtro/spl uml/der, 1982; Takeda et al, 2000). TPA has been used earlier for conventional spectrally nonselective recording in photo-chromic materials by focusing two perpendicularly directed laser beams (with photon energies /spl planck//spl omega//sub 1/ and /spl planck//spl omega//sub 2/) on to one spot (Parthenopoulos and Rentzepis, Science, vol. 245, pp. 843-845, 1989). Since the sample is transparent for each beam separately, TPA occurs only at the beam intersection point. In this paper, we investigate frequency-selective SHB by TPA in organic dye-doped polymers at low temperature. In our experiments, the SHB medium is essentially transparent for the writing beams, which allows unrestricted penetration and focusing in the depth of the sample.

DOI: 10.1109/cleo.2001.947936

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Summary form only given. Spectral hole burning (SHB) is a promising technique for optical recording of information with a potential to store in excess of 10/sup 4/-10/sup 5/ bits per /spl lambda//sup 3/ volume (Moerner, 1988). Highest storage capacity is achieved when frequency- or time-domain addressing is combined with addressing in three spatial dimensions by using a bulk SHB medium. However, so far both bit-by-bit and holographic SHB storage experiments were restricted to two spatial dimensions. This is because focusing a laser beam to a small volume inside the SHB medium is hindered by one-photon absorption in SHB material layers. We propose that this problem may be overcome by burning holes via two-photon absorption (TPA) (Demtro/spl uml/der, 1982; Takeda et al, 2000). TPA has been used earlier for conventional spectrally nonselective recording in photo-chromic materials by focusing two perpendicularly directed laser beams (with photon energies /spl planck//spl omega//sub 1/ and /spl planck//spl omega//sub 2/) on to one spot (Parthenopoulos and Rentzepis, Science, vol. 245, pp. 843-845, 1989). Since the sample is transparent for each beam separately, TPA occurs only at the beam intersection point. In this paper, we investigate frequency-selective SHB by TPA in organic dye-doped polymers at low temperature. In our experiments, the SHB medium is essentially transparent for the writing beams, which allows unrestricted penetration and focusing in the depth of the sample.

Spectral hole burning (SHB) allows to extend conventional spatial-domain optical data storage and coherent processing into the dimensions of frequency and time. To achieve ultrafast performance, on the time scale of 10-12 - 10-13s, we use organic dye-doped polymer materials at liquid-helium temperature. These materials enable SHB recording and coherent transient responses with a broad optical band width of 5 - 10 THz. We discuss applications of organic SHB systems for associative recall of time-and-space domain events, spectral programming of pulse trains, Stark switching of holograms, THz-bit-rate multiplication, cross- spectral processing and photon gated recording of erasure resistant coherent transients.

Persistent spectral hole burning (PSHB) in organic molecules doped in a polymer matrix at low temperatures allows optical recording of information in the dimensions of frequency and time, as well as in space and externally applied electric field. We use this special property to demonstrate new types of holograms, which extend conventional spatial-domain optical data storage into the new dimensions. Basic aspects of recording and playback of holograms by persistent spectral hole burning, including relation between frequency- and time-domain response function, is discussed. This paper is elucidating inherent relations between the time- and frequency-domain versions of PSHB holography. We show that by multiplexing holograms in the frequency dimension, we can store a large number (up to 12 000) of image holograms using a single spectral hole burning sample. In the time domain, we show storage and reproduction of ultrashort time-space images on the scale of 10 -12 −10 -13 s. Experiments demonstrating unusual hologram properties, such as causality-related asymmetry of diffraction, inversion of time coordinate, and ultrafast processing, are presented.

Time-and-space-domain holography [1,2] can be regarded as an extension of a conventional holographic process, where, in addition to the spatial image, the hologram plays back the time dependence of an event. The play-back of events is possible because we are using highly frequency-selective inhomogeneously broadened absorbers as recording material. This technique has a variety of potential applications in optical data storage and processing. In the present paper we consider the basic physical principle of time-and-space-domain storage in frequency-selective materials which exploit the effect of spectral hole burning [3]. In particular we will show that organic dye-doped spectral hole burning materials allow recording and playback of pi- co- and femtosecond time-scale events.

Persistent spectral hole-burning (PHB) is a phenomenon that allows an additional dimension, the frequency at which spectral holes are written, to be used to encode digital data. PHB can be used to store a large number of bits of information in the volume irradiated by a focused laser beam, leading to a possible future storage technology, frequency domain optical storage. A large number of photochemical and photophysical mechanisms have led to the production of spectral holes; a wealth of information has been learned about host-guest interactions, dephasing, and solid-state photochemistry at low temperatures. The general structure of a frequency domain optical store places a set of constraints on the engineering of such a system as well as on the materials used as recording media. The dynamics of the hole-burning process are crucial; for monophotonic mechanisms in particular, a set of stringent constraints can be derived that limit the applicability of this class of materials. Recent discoveries of two-color, photon-gated hole-burning offer special promise for nondestructive reading and improved performance.

Persistent spectral hole burning (PSHB) [1] allows for frequency selective recording of holograms and opens interesting prospects for high density optical information storage and processing. When hole burning is performed with the interference pattern of two crossed laser beams a spectrally narrow hole is created in an inhomogeneously broadened absorption band and simultaneously the spatial fringe pattern is recorded as a modulation of the hole depth. During reconstruction of the hologram diffraction from this spatial fringe pattern occurs, reflecting the changes of the absorption coefficient and the refractive index introduced by the spectral hole [2].