TY - JOUR AU - Sharif, S. M. AU - Ogusu, K. PY - 2011/04/28 Y2 - 2024/03/29 TI - Enhanced and Constant-value Transient Diffraction Efficiency from a Recorded Grating in a BaTiO3 Crystal JF - Journal of Scientific Research JA - J. Sci. Res. VL - 3 IS - 2 SE - Section A: Physical and Mathematical Sciences DO - 10.3329/jsr.v3i2.5593 UR - https://banglajol.info/index.php/JSR/article/view/5593 SP - 217-224 AB - <p>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 BaTiO<sub>3</sub> crystal. After writing a steady-state grating by two cw recording beams (<em>&lambda;</em>=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&nbsp; 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.</p><p><em>Keywords:</em> Photorefractive effect; Transient diffraction efficiency; Steady-state volume grating; Ferroelectric perovskite crystal.</p><p>&copy; 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.</p><p>doi:10.3329/jsr.v3i2.5593&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; J. Sci. Res. <strong>3</strong> (2), 217-224 (2011)</p> ER -