Measurements of absorption and proton activation in crystals with applications to holographic storage

Myeongkyu Lee, Robert S. Feigelson, Alice Liu, Lambertus Hesselink

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

(Formula presented) is a material under consideration for electro-optic and photorefractive applications. Single crystals of (Formula presented) have been grown using the vertical Bridgman method in the composition range (Formula presented) The formation and thermal fixing of holographic gratings in these crystals were recently demonstrated. In this study the (Formula presented) absorption spectra were measured by fourier-transform infrared spectrometry. As-grown crystals showed a strong (Formula presented) absorption near (Formula presented) revealing the existence of protons (Formula presented) which are essential for the thermal fixing of holograms. The dependence of the integrated (Formula presented) optical-absorption intensity on polarization showed that all of the O-H bonds were polarized either perpendicular or parallel to the (Formula presented) axis, with a greater proportion perpendicular. The proton concentration could be increased by heat treatment in a humid atmosphere and decreased in an ambient or oxygen atmosphere. The diffusivity of protons perpendicular to the (Formula presented) axis was measured in (Formula presented) by proton in-diffusion experiments and was found to be (Formula presented) at 750 °C, which is comparable to the proton diffusivity in (Formula presented) and (Formula presented) at the same temperature. Measurements of the thermal decay of holograms showed that the proton activation energy, (Formula presented) in (Formula presented) was (Formula presented) which is close to the proton activation energies reported for (Formula presented) and (Formula presented) 1.10-1.40 eV and 0.81-1.04 eV, respectively.

Original languageEnglish
Pages (from-to)7898-7904
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number13
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

Protons
Chemical activation
activation
Crystals
protons
crystals
Holograms
Activation energy
Holographic gratings
Crystal growth from melt
Electrooptical effects
Light absorption
Spectrometry
Absorption spectra
Fourier transforms
Heat treatment
Single crystals
Polarization
fixing
Oxygen

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

@article{87b97e3b1d4f45e4bd865e41a9822eb7,
title = "Measurements of absorption and proton activation in crystals with applications to holographic storage",
abstract = "(Formula presented) is a material under consideration for electro-optic and photorefractive applications. Single crystals of (Formula presented) have been grown using the vertical Bridgman method in the composition range (Formula presented) The formation and thermal fixing of holographic gratings in these crystals were recently demonstrated. In this study the (Formula presented) absorption spectra were measured by fourier-transform infrared spectrometry. As-grown crystals showed a strong (Formula presented) absorption near (Formula presented) revealing the existence of protons (Formula presented) which are essential for the thermal fixing of holograms. The dependence of the integrated (Formula presented) optical-absorption intensity on polarization showed that all of the O-H bonds were polarized either perpendicular or parallel to the (Formula presented) axis, with a greater proportion perpendicular. The proton concentration could be increased by heat treatment in a humid atmosphere and decreased in an ambient or oxygen atmosphere. The diffusivity of protons perpendicular to the (Formula presented) axis was measured in (Formula presented) by proton in-diffusion experiments and was found to be (Formula presented) at 750 °C, which is comparable to the proton diffusivity in (Formula presented) and (Formula presented) at the same temperature. Measurements of the thermal decay of holograms showed that the proton activation energy, (Formula presented) in (Formula presented) was (Formula presented) which is close to the proton activation energies reported for (Formula presented) and (Formula presented) 1.10-1.40 eV and 0.81-1.04 eV, respectively.",
author = "Myeongkyu Lee and Feigelson, {Robert S.} and Alice Liu and Lambertus Hesselink",
year = "1997",
month = "1",
day = "1",
doi = "10.1103/PhysRevB.56.7898",
language = "English",
volume = "56",
pages = "7898--7904",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "13",

}

Measurements of absorption and proton activation in crystals with applications to holographic storage. / Lee, Myeongkyu; Feigelson, Robert S.; Liu, Alice; Hesselink, Lambertus.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 13, 01.01.1997, p. 7898-7904.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurements of absorption and proton activation in crystals with applications to holographic storage

AU - Lee, Myeongkyu

AU - Feigelson, Robert S.

AU - Liu, Alice

AU - Hesselink, Lambertus

PY - 1997/1/1

Y1 - 1997/1/1

N2 - (Formula presented) is a material under consideration for electro-optic and photorefractive applications. Single crystals of (Formula presented) have been grown using the vertical Bridgman method in the composition range (Formula presented) The formation and thermal fixing of holographic gratings in these crystals were recently demonstrated. In this study the (Formula presented) absorption spectra were measured by fourier-transform infrared spectrometry. As-grown crystals showed a strong (Formula presented) absorption near (Formula presented) revealing the existence of protons (Formula presented) which are essential for the thermal fixing of holograms. The dependence of the integrated (Formula presented) optical-absorption intensity on polarization showed that all of the O-H bonds were polarized either perpendicular or parallel to the (Formula presented) axis, with a greater proportion perpendicular. The proton concentration could be increased by heat treatment in a humid atmosphere and decreased in an ambient or oxygen atmosphere. The diffusivity of protons perpendicular to the (Formula presented) axis was measured in (Formula presented) by proton in-diffusion experiments and was found to be (Formula presented) at 750 °C, which is comparable to the proton diffusivity in (Formula presented) and (Formula presented) at the same temperature. Measurements of the thermal decay of holograms showed that the proton activation energy, (Formula presented) in (Formula presented) was (Formula presented) which is close to the proton activation energies reported for (Formula presented) and (Formula presented) 1.10-1.40 eV and 0.81-1.04 eV, respectively.

AB - (Formula presented) is a material under consideration for electro-optic and photorefractive applications. Single crystals of (Formula presented) have been grown using the vertical Bridgman method in the composition range (Formula presented) The formation and thermal fixing of holographic gratings in these crystals were recently demonstrated. In this study the (Formula presented) absorption spectra were measured by fourier-transform infrared spectrometry. As-grown crystals showed a strong (Formula presented) absorption near (Formula presented) revealing the existence of protons (Formula presented) which are essential for the thermal fixing of holograms. The dependence of the integrated (Formula presented) optical-absorption intensity on polarization showed that all of the O-H bonds were polarized either perpendicular or parallel to the (Formula presented) axis, with a greater proportion perpendicular. The proton concentration could be increased by heat treatment in a humid atmosphere and decreased in an ambient or oxygen atmosphere. The diffusivity of protons perpendicular to the (Formula presented) axis was measured in (Formula presented) by proton in-diffusion experiments and was found to be (Formula presented) at 750 °C, which is comparable to the proton diffusivity in (Formula presented) and (Formula presented) at the same temperature. Measurements of the thermal decay of holograms showed that the proton activation energy, (Formula presented) in (Formula presented) was (Formula presented) which is close to the proton activation energies reported for (Formula presented) and (Formula presented) 1.10-1.40 eV and 0.81-1.04 eV, respectively.

UR - http://www.scopus.com/inward/record.url?scp=0000054959&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000054959&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.56.7898

DO - 10.1103/PhysRevB.56.7898

M3 - Article

VL - 56

SP - 7898

EP - 7904

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 13

ER -