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Physical Review E

Form factor in persistent hole burning in multiple scattering optical media

Makoto Tomita, Shuho Tatsuno

Published Jun 23, 2006• 0 citations
Publisher

Abstract

This paper presents detailed experiments on persistent hole burning in photoreactive and multiple scattering media. The dependence of the hole shape and width on the sample thickness, transport mean free path, and absorption length was measured. The experimental results show good agreement with a previously reported theoretical calculation on the basis of a diffusion approximation [Phys. Rev. E 70, 046606 (2004)].

DOI
10.1103/physreve.73.066622

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Spectral Hole-Burning and Related Spectroscopies: Science and Applications•Jan 1, 1994•0 citations
This paper presents detailed experiments on persistent hole burning in photoreactive and multiple scattering media. The dependence of the hole shape and width on the sample thickness, transport mean free path, and absorption length was measured. The experimental results show good agreement with a previously reported theoretical calculation on the basis of a diffusion approximation [Phys. Rev. E 70, 046606 (2004)].
We analyzed the shape and width of room-temperature persistent holes in photoreactive and multiple-scattering media in frequency and wave-vector domains. The shape and width of holes depend on sample thickness, transport mean free path, geometrical configuration, and absorption lengths. The measurements of the angular dependence of hole burning in a disordered CdS0.85Se0.15{\mathrm{CdS}}_{0.85}{\mathrm{Se}}_{0.15}CdS0.85​Se0.15​- doped glass sample were in quantitative agreement with theory.
We investigated the time development of persistent hole burning in photoreactive and multiple-scattering media. In this hole burning, a writing laser beam recodes the volume speckle pattern inside the medium through the photoreactive process, and then the luminescence intensity excited by a reading beam is measured as a function of the frequency or wave vector difference between the writing and reading beams. The time development reflects the statistics of the intensity fluctuations in the speckle inside the medium. One of the striking results is that the maximum hole depth is approximately 0.26 . We distinguish three types of samples according to the geometric configurations and the photoreactive processes and discuss the hole shape, hole width, and the depth during time development. Hole burning experiments were also performed using a spiropyran derivative photochromic dye. The experimental results showed good agreement with the theory.
Persistent spectral hole burning (PSHB) has attracted much attention due not only to its usefulness in site-selective spectroscopy but also to its applicability to wavelength multiplexed optical memory in the future.1) Though the application is still far from realization, potentially 103 times higher storage density would be attainable. Technological breakthrough is largely concerned with the issue of optimizing the storage materials. For the formation of persistent holes, the existence of both photoreactive centers and a solid matrix is essential, hence the comprehension of intramolecular and intermolecular electron-phonon interaction is of great importance. We have already proposed one working hypothesis, which, derived mainly from the experiments related to the intermolecular interactions, emphasizes the possibility of controlling the mesoscopic structure of the materials.2-4)
Persistent spectral hole burning is observed in Sm(2+)-doped glasses at room temperature. The holes are burned in the (7)F(0) ? (5)D(0), (5)D(1) lines of the Sm(2+) ions in three kinds of fluoride glass. The dependence of the burning efficiency on the sample and on the burning intensity is measured. The intensity dependence is approximately linear, and no antihole is observed around the burned hole. The hole-burning mechanism is discussed. The temperature dependence of the homogeneous width is also measured.
We reported the first observation of room-temperature persistent spectral hole burning in Sm2+-doped fluoride glass in the last conference [1]. Room-temperature hole burning had been also observed in Sm2+-doped crystals [2]. We found considerable differences in the hole-burning characteristics between Sm2+-doped glasses and Sm2+-doped crystals: The burning-laser-intensity dependence is approximately linear, and no antihole is observed around the hole burned in Sm2+-doped glasses [3]. More detailed experimental studies are needed to clarify the mechanism of the hole burning in this glass and to explore more efficient hole-burning systems. In this paper, we report several experimental results related to wavelength dependence of the hole burning process.