title: IR Image upconversion using band-limited ASE illumination fiber sources.
abstract: 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.
authors.forename: H
authors.initials: H
authors.lastname: Maestre
authors.forename: A J
authors.initials: AJ
authors.lastname: Torregrosa
authors.forename: J
authors.initials: J
authors.lastname: Capmany