A photorefractive image amplifier: Characteristics and evaluation

Authors

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