Enhanced and Constant-value Transient Diffraction Efficiency from a Recorded Grating in a BaTiO<sub>3</sub> Crystal

Authors

  • S. M. Sharif Shah Jalal University of Science and technology, Sylhet, Bangladesh
  • K. Ogusu Shizuoka University, 3-5-1, Johoku, Hamamatsu 432-8561

DOI:

https://doi.org/10.3329/jsr.v3i2.5593

Keywords:

Photorefractive effect, Transient diffraction efficiency, Steady-state volume grating, Ferroelectric perovskite crystal.

Abstract

A simple method has been proposed here to get an enhanced and constant-value transient diffraction efficiency for a large time scale from a recorded grating in an undoped BaTiO3 crystal. After writing a steady-state grating by two cw recording beams (λ=514.5 nm), when the recording beams are switched off, the recorded grating as well as the diffraction efficiency decreases at a faster rate initially, and  thereafter reaches to almost a stationary level for some few seconds. The diffraction efficiency for this level is very small compared to that for a steady-state grating and it becomes smaller slowly with time. We can increase (about twice the initial stationary-level value) this small diffraction efficiency from its any initial value and have this value (increased) constantly for a large time scale by using a suitable backward-pulsed reading beam containing the same properties as the recording beams.

Keywords: Photorefractive effect; Transient diffraction efficiency; Steady-state volume grating; Ferroelectric perovskite crystal.

© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.

doi:10.3329/jsr.v3i2.5593                J. Sci. Res. 3 (2), 217-224 (2011)

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Author Biographies

S. M. Sharif, Shah Jalal University of Science and technology, Sylhet, Bangladesh

Associate Professor

Department of Physics,

Shah Jalal University of Science and Technology, Sylhet, Bangladesh

K. Ogusu, Shizuoka University, 3-5-1, Johoku, Hamamatsu 432-8561

Professor

Department of Electrical and Electronic Engineering, Shizuoka University, 3-5-1, Johoku, Hamamatsu 432-8561, Japan

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Published

2011-04-28

How to Cite

Sharif, S. M., & Ogusu, K. (2011). Enhanced and Constant-value Transient Diffraction Efficiency from a Recorded Grating in a BaTiO<sub>3</sub> Crystal. Journal of Scientific Research, 3(2), 217–224. https://doi.org/10.3329/jsr.v3i2.5593

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Section

Section A: Physical and Mathematical Sciences