Open AccessIR-to-visible image upconverter under nonlinear crystal thermal gradient operation
Author(s) -
H. Maestre,
A. J. Torregrosa,
Carlos R. Fernández-Pousa,
J. Capmany
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.001133
Subject(s) - optics , materials science , wavelength , crystal (programming language) , temperature gradient , infrared , thermal , numerical aperture , aperture (computer memory) , nonlinear optics , optoelectronics , physics , computer science , laser , quantum mechanics , meteorology , acoustics , programming language
In this work we study the enhancement of the field-of-view of an infrared image up-converter by means of a thermal gradient in a PPLN crystal. Our work focuses on compact upconverters, in which both a short PPLN crystal length and high numerical aperture lenses are employed. We found a qualitative increase in both wavelength and angular tolerances, compared to a constant temperature upconverter, which makes it necessary a correct IR wavelength allocation in order to effectively increase the up-converted area.