Open AccessIR Image upconversion using band-limited ASE illumination fiber sources
Author(s) -
H. Maestre,
A. J. Torregrosa,
J. Capmany
Publication year - 2016
Publication title -
optics express
Language(s) - Lithuanian
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.008581
Subject(s) - photon upconversion , optics , narrowband , amplified spontaneous emission , materials science , laser , fiber laser , wavelength , optical fiber , physics , optoelectronics
We study the field-of-view (FOV) of an upconversion imaging system that employs an Amplified Spontaneous Emission (ASE) fiber source to illuminate a transmission target. As an intermediate case between narrowband laser and thermal illumination, an ASE fiber source allows for higher spectral intensity than thermal illumination and still keeps a broad wavelength spectrum to take advantage of an increased non-collinear phase-matching angle acceptance that enlarges the FOV of the upconversion system when compared to using narrowband laser illumination. A model is presented to predict the angular acceptance of the upconverter in terms of focusing and ASE spectral width and allocation. The model is experimentally checked in case of 1550-630 nm upconversion.