A photorefractive image amplifier: Characteristics and evaluation

Authors

Raphael Guerrero National Institute of Physics, University of the Philippines Diliman
Darwin Palima National Institute of Physics, University of the Philippines Diliman
Marlon Rosendo Daza National Institute of Physics, University of the Philippines Diliman

Abstract

Low-noise amplification with small laser intensities may be achieved by two-wave mixing (2WM) in a photorefractive crystal. The photorefractive effect is a bulk phenomenon wherein the local index of refraction is changed by the presence of an interference pattern inside the medium.
Gray-scale images were successfully amplified by 2WM in a BSO crystal. Amplified images were observed to have higher gray values with an average relative gain of 5.9 and enhanced image edges. The overall brightness increased by a factor of 2.7, with a corresponding improvement in the image contrast range. The amplifier response function for a focused image demonstrates sensitivity at higher spatial frequencies along the x-axis and has an approximately constant value, indicating fidelity of image information.

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Issue

1998: Proceedings of the 16th National Physics Congress of the Samahang Pisika ng Pilipinas

Article ID

SPP-1998-OP-05

Section

Optics and Photonics

Published

1998-10-27

How to Cite

[1]

R Guerrero, D Palima, and MR Daza, A photorefractive image amplifier: Characteristics and evaluation, Proceedings of the Samahang Pisika ng Pilipinas 16, SPP-1998-OP-05 (1998). URL: https://proceedings.spp-online.org/article/view/SPP-1998-OP-05.